The M50 was BMW's first twin-cam, twenty-four-valve straight-six for the mass market. It powered the E34 520i and 525i and the E36 320i and 325i, and it is the foundation for many E30 six-cylinder swaps.
Swappers like the M50 because it is strong, revs cleanly and fits older chassis with known parts. The M50TU from 1992 added single VANOS for more mid-range torque. Like most BMW engines of the era, the cooling system is its weak point.
- Production: 1954–1996
- Versions covered: M502, M503, M507, M50B20, M50B25, M50TUB20 and M50TUB25
- Output range: 100–192 hp
- Fuel and layout: petrol V8 and petrol inline-6
- Fitted to: 10 BMW models across 2 chassis generations
- In our stock now: 23 units from 907,00 € — browse all M50 engines
The M50 at a glance
The table lists every M50 version we supply with its capacity, layout, output and production years. Use it with your car's engine code to find the right unit.
| Engine code | Capacity | Layout | Power | Torque | Years |
|---|---|---|---|---|---|
| M502 | 2.6 L | V8, naturally aspirated | 100 hp | 180 Nm | 1954–1961 |
| M503 | 3.2 L | V8, naturally aspirated | 140 hp | 240 Nm | 1956–1959 |
| M507 | 3.2 L | V8, naturally aspirated | 150 hp | 240 Nm | 1956–1959 |
| M50B20 | 2.0 L | Inline-6, naturally aspirated | 150 hp | 190 Nm | 1990–1996 |
| M50B25 | 2.5 L | Inline-6, naturally aspirated | 192 hp | 245 Nm | 1990–1996 |
| M50TUB20 | 2.0 L | Inline-6, naturally aspirated | 150 hp | 190 Nm | 1992–1995 |
| M50TUB25 | 2.5 L | Inline-6, naturally aspirated | 192 hp | 245 Nm | 1992–1995 |
Across 7 versions, output runs from 100 to 192 hp. The spread reflects different capacities, tuning for different markets and the technical updates BMW made over 43 years of production.
History of the M50
BMW introduced the M50 in 1990 at 2.0 and 2.5 litres with an iron block, aluminium head, chain-driven camshafts and coil-on-plug ignition. The M50TU of 1992 added single VANOS on the intake camshaft. The aluminium M52 replaced it from 1994.
1954: the M502 arrived with 2.6 L and 100 hp in the BMW 502 2.6 and BMW 503 2.6.
1956: the M503 arrived with 3.2 L and 140 hp in the BMW 503 3.2 and BMW 507 3.2. Compared with the M502, it added 40 hp.
1956: the M507 arrived with 3.2 L and 150 hp in the BMW 507 Roadster and BMW 503 Coupe. Compared with the M503, it added 10 hp.
1990: the M50B20 arrived with 2.0 L and 150 hp in the BMW E36 320i and BMW E34 520i. It matched the M507 for power.
1990: the M50B25 arrived with 2.5 L and 192 hp in the BMW E36 325i and BMW E34 525i. Compared with the M50B20, it added 42 hp.
1992: the M50TUB20 arrived with 2.0 L and 150 hp in the BMW E36 320i and BMW E34 520i. It was a lower-output version for smaller or more economical models.
1992: the M50TUB25 arrived with 2.5 L and 192 hp in the BMW E36 325i and BMW E34 525i. Compared with the M50TUB20, it added 42 hp.
Every M50 version explained
M502 (2.6 L, 100 hp)
The M502 is a 2.6 L V8 petrol engine, naturally aspirated, rated at 100 hp and 180 Nm. BMW built it from 1954 to 1961. That is about 38 hp and 69 Nm per litre, a relaxed tune aimed at torque, durability and economy. Within the M50 family, the M503 (140 hp), M507 (150 hp) and M50B20 (150 hp) are more powerful. It was fitted to the BMW 502 2.6 and BMW 503 2.6.
We have 3 M502 units in stock, priced from 2.603,00 € to 2.728,00 €.
M503 (3.2 L, 140 hp)
The M503 is a 3.2 L V8 petrol engine, naturally aspirated, rated at 140 hp and 240 Nm. BMW built it from 1956 to 1959. That is about 44 hp and 75 Nm per litre, a relaxed tune aimed at torque, durability and economy. Within the M50 family, the M507 (150 hp), M50B20 (150 hp) and M50B25 (192 hp) are more powerful, while the M502 (100 hp) is milder. It was fitted to the BMW 503 3.2 and BMW 507 3.2.
We have 3 M503 units in stock, priced from 4.100,00 € to 4.127,00 €.
M507 (3.2 L, 150 hp)
M507: 3.2 L, V8, petrol, naturally aspirated. Output is 150 hp with 240 Nm of torque, and production ran from 1956 to 1959. That is about 47 hp and 75 Nm per litre, a relaxed tune aimed at torque, durability and economy. Within the M50 family, the M50B25 (192 hp) and M50TUB25 (192 hp) are more powerful, while the M502 (100 hp) and M503 (140 hp) are milder. It was fitted to the BMW 507 Roadster and BMW 503 Coupe.
We have 3 M507 units in stock, priced from 4.673,00 € to 4.718,00 €.
M50B20 (2.0 L, 150 hp)
The M50B20 is a 2.0 L inline-6 petrol engine, naturally aspirated, rated at 150 hp and 190 Nm. BMW built it from 1990 to 1996. That is about 75 hp and 95 Nm per litre, a strong figure for a road engine of its era. Within the M50 family, the M50B25 (192 hp) and M50TUB25 (192 hp) are more powerful, while the M502 (100 hp) and M503 (140 hp) are milder. It was fitted to the BMW E36 320i and BMW E34 520i.
Reading the code: M marks an M-series code, the naming BMW used for its engine families up to the early 2000s; 50 is the family number; B stands for petrol (from the German Benzin); 20 is the capacity in decilitres, so 2.0 litres.
We have 4 M50B20 units in stock, priced from 1.313,00 € to 3.133,00 €.
M50B25 (2.5 L, 192 hp)
The M50B25 is a 2.5 L inline-6 petrol engine, naturally aspirated, rated at 192 hp and 245 Nm. BMW built it from 1990 to 1996. That is about 77 hp and 98 Nm per litre, a strong figure for a road engine of its era. Within the M50 family, it is the most powerful version, while the M502 (100 hp), M503 (140 hp) and M507 (150 hp) are milder. It was fitted to the BMW E36 325i and BMW E34 525i.
Reading the code: M marks an M-series code, the naming BMW used for its engine families up to the early 2000s; 50 is the family number; B stands for petrol (from the German Benzin); 25 is the capacity in decilitres, so 2.5 litres.
We have 4 M50B25 units in stock, priced from 1.522,00 € to 3.009,00 €.
M50TUB20 (2.0 L, 150 hp)
M50TUB20: 2.0 L, inline-6, petrol, naturally aspirated. Output is 150 hp with 190 Nm of torque, and production ran from 1992 to 1995. That is about 75 hp and 95 Nm per litre, a strong figure for a road engine of its era. Within the M50 family, the M50B25 (192 hp) and M50TUB25 (192 hp) are more powerful, while the M502 (100 hp) and M503 (140 hp) are milder. It was fitted to the BMW E36 320i and BMW E34 520i.
We have 3 M50TUB20 units in stock, priced from 907,00 € to 937,00 €.
M50TUB25 (2.5 L, 192 hp)
The M50TUB25 is a 2.5 L inline-6 petrol engine, naturally aspirated, rated at 192 hp and 245 Nm. BMW built it from 1992 to 1995. That is about 77 hp and 98 Nm per litre, a strong figure for a road engine of its era. Within the M50 family, it is the most powerful version, while the M502 (100 hp), M503 (140 hp) and M507 (150 hp) are milder. It was fitted to the BMW E36 325i and BMW E34 525i.
We have 3 M50TUB25 units in stock, priced from 1.210,00 € to 1.219,00 €.
Which cars use the M50
The M50 was fitted to 10 models. The list below is grouped by chassis generation so you can find your car quickly. Always confirm the exact code with your VIN, because BMW often used more than one engine in the same model.
Other models with the M50
The M50 also powered the 502 2.6 (M502, 100 hp), 503 2.6 (M502, 100 hp), 503 3.2 (M503, 140 hp), 507 3.2 (M503, 140 hp), 507 Roadster (M507, 150 hp) and 503 Coupe (M507, 150 hp).
BMW E36 third 3 Series (1990–2000)
In the third 3 Series, built 1990–2000 as a saloon, Touring, coupé, convertible, Compact, the M50 powered the 320i (M50B20, 150 hp), 325i (M50B25, 192 hp), 320i (M50TUB20, 150 hp) and 325i (M50TUB25, 192 hp).
When ordering for an E36, check whether the car is rear-drive or xDrive and whether it has a manual or automatic gearbox, because the sump and flywheel can differ. We currently have 4 M50 units from E36 donor cars. All E36 engines in stock.
The 320i uses the M50B20. BMW 320i engines for sale.
The 325i uses the M50B25. BMW 325i engines for sale.
The 320i uses the M50TUB20. BMW 320i engines for sale.
The 325i uses the M50TUB25. BMW 325i engines for sale.
BMW E34 third 5 Series (1988–1996)
In the third 5 Series, built 1988–1996 as a saloon, Touring, the M50 powered the 520i (M50B20, 150 hp), 525i (M50B25, 192 hp), 520i (M50TUB20, 150 hp) and 525i (M50TUB25, 192 hp).
For an E34, confirm the production date as well as the model: BMW often changed engine versions at the mid-life update. We currently have 4 M50 units from E34 donor cars. All E34 engines in stock.
The 520i uses the M50B20. BMW 520i engines for sale.
The 525i uses the M50B25. BMW 525i engines for sale.
The 520i uses the M50TUB20. BMW 520i engines for sale.
The 525i uses the M50TUB25. BMW 525i engines for sale.
Will an M50 fit my BMW? Model-by-model answers
Short answers for every model that left the factory with an M50, with prices from our current stock.
Will the M502 fit my BMW 502 2.6?
The M502 is the original engine for the BMW 502 2.6, which makes it the straightforward choice. Confirm the drive type (rear-drive or xDrive), the gearbox (manual or automatic) and the emissions standard, because these can change the sump, the flywheel and the software. Send us the VIN and we check all of it for you.
How much is a replacement engine for a BMW 502 2.6?
We have 3 M502 engines in stock, priced from 2.603,00 € to 2.728,00 €. Delivery to your door is included, and the engine carries a 12-month warranty when fitted by a qualified workshop. Add fitting labour and the parts you replace at the same time — seals, cooling parts and mounts — to estimate the total.
Will the M502 fit my BMW 503 2.6?
For the BMW 503 2.6, the M502 is the factory engine and the one to order. Confirm the drive type (rear-drive or xDrive), the gearbox (manual or automatic) and the emissions standard, because these can change the sump, the flywheel and the software. Send us the VIN and we check all of it for you.
How much is a replacement engine for a BMW 503 2.6?
We have 3 M502 engines in stock, priced from 2.603,00 € to 2.728,00 €. Delivery to your door is included, and the engine carries a 12-month warranty when fitted by a qualified workshop. Add fitting labour and the parts you replace at the same time — seals, cooling parts and mounts — to estimate the total.
Will the M503 fit my BMW 503 3.2?
The M503 is the original engine for the BMW 503 3.2, which makes it the straightforward choice. Confirm the drive type (rear-drive or xDrive), the gearbox (manual or automatic) and the emissions standard, because these can change the sump, the flywheel and the software. Send us the VIN and we check all of it for you.
How much is a replacement engine for a BMW 503 3.2?
We have 3 M503 engines in stock, priced from 4.100,00 € to 4.127,00 €. Delivery to your door is included, and the engine carries a 12-month warranty when fitted by a qualified workshop. Add fitting labour and the parts you replace at the same time — seals, cooling parts and mounts — to estimate the total.
Will the M503 fit my BMW 507 3.2?
The M503 is the original engine for the BMW 507 3.2, which makes it the straightforward choice. Confirm the drive type (rear-drive or xDrive), the gearbox (manual or automatic) and the emissions standard, because these can change the sump, the flywheel and the software. Send us the VIN and we check all of it for you.
How much is a replacement engine for a BMW 507 3.2?
We have 3 M503 engines in stock, priced from 4.100,00 € to 4.127,00 €. Delivery to your door is included, and the engine carries a 12-month warranty when fitted by a qualified workshop. Add fitting labour and the parts you replace at the same time — seals, cooling parts and mounts — to estimate the total.
Will the M507 fit my BMW 507 Roadster?
The M507 is the original engine for the BMW 507 Roadster, which makes it the straightforward choice. Confirm the drive type (rear-drive or xDrive), the gearbox (manual or automatic) and the emissions standard, because these can change the sump, the flywheel and the software. Send us the VIN and we check all of it for you.
How much is a replacement engine for a BMW 507 Roadster?
We have 3 M507 engines in stock, priced from 4.673,00 € to 4.718,00 €. Delivery to your door is included, and the engine carries a 12-month warranty when fitted by a qualified workshop. Add fitting labour and the parts you replace at the same time — seals, cooling parts and mounts — to estimate the total.
Will the M507 fit my BMW 503 Coupe?
Yes, the BMW 503 Coupe left the factory with the M507, so an M507 from another car is the direct replacement. Confirm the drive type (rear-drive or xDrive), the gearbox (manual or automatic) and the emissions standard, because these can change the sump, the flywheel and the software. Send us the VIN and we check all of it for you.
How much is a replacement engine for a BMW 503 Coupe?
We have 3 M507 engines in stock, priced from 4.673,00 € to 4.718,00 €. Delivery to your door is included, and the engine carries a 12-month warranty when fitted by a qualified workshop. Add fitting labour and the parts you replace at the same time — seals, cooling parts and mounts — to estimate the total.
Will the M50TUB20 fit my BMW E36 320i?
The M50TUB20 is the original engine for the BMW E36 320i, which makes it the straightforward choice. The third 3 Series was built 1990–2000, and the M50TUB20 was produced 1992–1995, so check that your car's build date falls inside that window. Confirm the drive type (rear-drive or xDrive), the gearbox (manual or automatic) and the emissions standard, because these can change the sump, the flywheel and the software. Send us the VIN and we check all of it for you.
How much is a replacement engine for a BMW E36 320i?
We have 1 M50TUB20 engine from E36 donor cars, priced from 937,00 €. Delivery to your door is included, and the engine carries a 12-month warranty when fitted by a qualified workshop. Add fitting labour and the parts you replace at the same time — seals, cooling parts and mounts — to estimate the total.
Will the M50TUB20 fit my BMW E34 520i?
For the BMW E34 520i, the M50TUB20 is the factory engine and the one to order. The third 5 Series was built 1988–1996, and the M50TUB20 was produced 1992–1995, so check that your car's build date falls inside that window. Confirm the drive type (rear-drive or xDrive), the gearbox (manual or automatic) and the emissions standard, because these can change the sump, the flywheel and the software. Send us the VIN and we check all of it for you.
How much is a replacement engine for a BMW E34 520i?
We have 1 M50TUB20 engine from E34 donor cars, priced from 928,00 €. Delivery to your door is included, and the engine carries a 12-month warranty when fitted by a qualified workshop. Add fitting labour and the parts you replace at the same time — seals, cooling parts and mounts — to estimate the total.
Will the M50TUB25 fit my BMW E36 325i?
Yes, the BMW E36 325i left the factory with the M50TUB25, so an M50TUB25 from another car is the direct replacement. The third 3 Series was built 1990–2000, and the M50TUB25 was produced 1992–1995, so check that your car's build date falls inside that window. Confirm the drive type (rear-drive or xDrive), the gearbox (manual or automatic) and the emissions standard, because these can change the sump, the flywheel and the software. Send us the VIN and we check all of it for you.
How much is a replacement engine for a BMW E36 325i?
We have 1 M50TUB25 engine from E36 donor cars, priced from 1.219,00 €. Delivery to your door is included, and the engine carries a 12-month warranty when fitted by a qualified workshop. Add fitting labour and the parts you replace at the same time — seals, cooling parts and mounts — to estimate the total.
Will the M50TUB25 fit my BMW E34 525i?
Yes, the BMW E34 525i left the factory with the M50TUB25, so an M50TUB25 from another car is the direct replacement. The third 5 Series was built 1988–1996, and the M50TUB25 was produced 1992–1995, so check that your car's build date falls inside that window. Confirm the drive type (rear-drive or xDrive), the gearbox (manual or automatic) and the emissions standard, because these can change the sump, the flywheel and the software. Send us the VIN and we check all of it for you.
How much is a replacement engine for a BMW E34 525i?
We have 1 M50TUB25 engine from E34 donor cars, priced from 1.210,00 €. Delivery to your door is included, and the engine carries a 12-month warranty when fitted by a qualified workshop. Add fitting labour and the parts you replace at the same time — seals, cooling parts and mounts — to estimate the total.
M50 model-year guide
Use this year-by-year guide to see which M50 versions were in production when your car was built.
1954 — M502 was in production. New this year: M502.
1955 — M502 was in production.
1956 — M502, M503 and M507 were in production. New this year: M503 and M507.
1957 — M502, M503 and M507 were in production.
1958 — M502, M503 and M507 were in production.
1959 — M502, M503 and M507 were in production. Last year for M503 and M507.
1960 — M502 was in production.
1961 — M502 was in production. Last year for M502.
1990 — M50B20 and M50B25 were in production. New this year: M50B20 and M50B25.
1991 — M50B20 and M50B25 were in production.
1992 — M50B20, M50B25, M50TUB20 and M50TUB25 were in production. New this year: M50TUB20 and M50TUB25.
1993 — M50B20, M50B25, M50TUB20 and M50TUB25 were in production.
1994 — M50B20, M50B25, M50TUB20 and M50TUB25 were in production.
1995 — M50B20, M50B25, M50TUB20 and M50TUB25 were in production. Last year for M50TUB20 and M50TUB25.
1996 — M50B20 and M50B25 were in production. Last year for M50B20 and M50B25.
Common M50 problems and what to check
No engine is perfect. These are the faults our workshop sees most often on the M50, what causes them and how to check a used unit before you buy.
Cooling system
Plastic water pump impellers, thermostat housings and expansion tanks crack, and overheating can warp the head.
How to check: Check for a metal impeller water pump and a recent expansion tank.
VANOS seals (M50TU)
The VANOS piston seals harden and the engine loses low-down torque and idles roughly.
How to check: Listen for a rattle at the front of the head at idle and check for a flat spot below 3,000 rpm.
Crankcase ventilation valve
The CCV valve can freeze or clog, pressurising the crankcase and pushing oil past seals.
How to check: Check for oil in the intake boot and around the dipstick tube.
Oil filter housing gasket
The gasket hardens and leaks oil down the side of the block.
How to check: Look for oil on the alternator side of the engine.
Valve cover gasket
A common leak that also lets oil into the spark plug wells.
How to check: Remove a coil and inspect the well.
Diagnosing a failing M50: symptoms and causes
If your current engine is showing one of these symptoms, this table helps you judge whether it can be repaired or whether a replacement M50 is the better route.
| Symptom | Likely cause |
|---|---|
| Knocking from the bottom of the engine | A deep knock that rises with engine speed usually means worn rod or main bearings. |
| Overheating or losing coolant | Coolant loss without visible leaks points to a head gasket or a cracked head; visible leaks point to the water pump, hoses, thermostat housing or expansion tank. |
| White smoke that smells sweet | Coolant burning in the cylinders, from a head gasket, a cracked head or, on diesels, a leaking EGR cooler. |
| Blue smoke | Oil burning in the cylinders. |
| Rough idle or misfire | Ignition coils, spark plugs, injectors and vacuum leaks are the usual causes. |
| Loss of power | Start with the simple things: air filter, boost leaks on turbo engines, fuel pressure and fault codes. |
| Rattle for a few seconds after a cold start | The classic sign of a weak timing chain tensioner or stretched chain. |
| Poor low-down torque and uneven idle | VANOS seals or solenoids. |
Knocking from the bottom of the engine. A deep knock that rises with engine speed usually means worn rod or main bearings. Stop driving: bearing failure ends with a broken connecting rod. A used engine is normally the most economical fix once the bottom end is damaged.
Overheating or losing coolant. Coolant loss without visible leaks points to a head gasket or a cracked head; visible leaks point to the water pump, hoses, thermostat housing or expansion tank. Overheating should be fixed before it warps the head.
White smoke that smells sweet. Coolant burning in the cylinders, from a head gasket, a cracked head or, on diesels, a leaking EGR cooler. Check the coolant level and look for oil in the coolant.
Blue smoke. Oil burning in the cylinders. A puff on start-up points to valve stem seals; constant smoke under load points to piston rings or, on turbo engines, turbo seals.
Rough idle or misfire. Ignition coils, spark plugs, injectors and vacuum leaks are the usual causes. A misfire on one cylinder that moves when you swap coils is a coil; one that stays is a plug, injector or compression problem.
Loss of power. Start with the simple things: air filter, boost leaks on turbo engines, fuel pressure and fault codes. A gradual loss with poor compression on a test points to internal wear.
Rattle for a few seconds after a cold start. The classic sign of a weak timing chain tensioner or stretched chain. It must be checked quickly: a chain that jumps a tooth can bend valves.
Poor low-down torque and uneven idle. VANOS seals or solenoids. The engine may run well at high revs but feel flat and lumpy at low speed.
Repair or replace your M50?
As a rule, bolt-on faults are worth repairing and internal damage is not. Seals, sensors, coils, injectors, pumps and turbos can be replaced in the car. Once the bearings, crankshaft, bores or head of an M50 are damaged, a used engine is usually cheaper and quicker than a rebuild.
Ask your workshop for a written diagnosis before deciding. A compression test, an oil analysis and a borescope inspection take an hour or two and remove most of the guesswork.
M50 maintenance and running costs
| Item | Recommendation |
|---|---|
| Engine oil | 5W-40 or 10W-40 synthetic, about 6.5 litres with filter. |
| Timing drive | Duplex lower chain and single upper chain at the front with hydraulic tensioner. |
| Service interval | Oil every 10,000 to 15,000 km; cooling system as a set every 100,000 km. |
Hydraulic lifters, no valve adjustment. Refresh VANOS seals when fitting a used M50TU.
Shorter oil intervals than the factory maximum are the cheapest insurance for an M50. Most of the expensive faults on BMW engines start with tired oil.
Cooling parts are consumables on this engine. Plan to replace the water pump, thermostat and expansion tank every 100,000 km or so, before they fail.
Buying a used M50: the full checklist
Work through these points before you order a used M50, whoever you buy from.
- Confirm the exact engine code. Read the code stamped on the block and compare it with the code for your car. Send us the last seven characters of the VIN and we confirm the match before anything is paid.
- Ask how the donor car was damaged. Most good used engines come from cars with body damage. A front-end impact can crack sensors, the timing cover or the sump; a rear or side impact usually leaves the engine untouched. The yard records the damage on each unit.
- Compression or leak-down figures. Even compression across all cylinders tells you more than mileage. Ask for the figures, not just a pass or fail, and compare the highest and lowest readings: a spread above 10 to 15 percent deserves a question.
- Look at the oil and coolant. Clean oil without metal particles and coolant without oil are good signs. Milky oil, oily coolant or a burnt smell mean the engine needs further checks before it is fitted.
- Photographs from every side. Good suppliers photograph the actual engine you will receive. Look for the block stamp, the sump, the timing cover and any broken brackets or connectors in the pictures.
- List of what is fitted. Engines are sold with different ancillaries: some have the turbo, injectors, manifolds, alternator and starter, others are long blocks. Agree the list in writing so you know which parts must come from your old engine.
- Sump, oil pickup and drive variants. Rear-drive, xDrive and front-drive cars can use different sumps, oil pickups and engine mounts even with the same engine code. Check that the sump matches your subframe and front axle.
- Gearbox and flywheel match. Manual and automatic engines differ at the flywheel or flexplate, and sometimes at the crankshaft spigot. Make sure the engine you buy matches your gearbox or that you transfer the right parts.
- Warranty terms in writing. Read what the warranty covers, how long it runs and what fitting conditions apply. Most warranties require a qualified workshop, new fluids and filters, and replacement of the cooling parts that caused the original failure.
- Why your old engine failed. Before fitting a replacement, find out why the original failed. An overheating radiator, a blocked intercooler or a failed turbo can destroy a second engine if they are not fixed.
- Timing chain noise. Listen for a rattle at the front of the engine for the first seconds after a cold start. On an engine that cannot be run, look at the chain guides through the oil filler or with the valve cover off.
- VANOS operation. Rough idle, a rattle from the front of the head and a loss of torque at low revs point to VANOS seals or solenoids. These are serviceable parts and are easier to renew with the engine out.
- Plastic cooling parts. Expansion tanks, thermostat housings and water pump impellers made of plastic crack with age. Plan to replace them when the engine is fitted.
M50 prices: what you should pay
We currently hold 23 M50 engines. The cheapest is 907,00 €, the most expensive 4.718,00 €, and half of them cost less than 1.805,00 €.
Prices depend on the exact version, the donor's mileage, how complete the engine is and the demand for that code. Higher-output versions, low mileage and dressed engines with turbo, injectors and ancillaries cost more; long blocks and higher mileage cost less.
M50 engines in stock now
These M50 units are in our Hamburg yard right now. Each listing shows real photographs of the engine you receive, its mileage and what is fitted.
BMW 502 2.6 M502 Complete Engine2.603,00 €BMW 503 Coupe M507 Complete Engine4.673,00 €BMW E34 525i M50B25 Complete Engine1.729,00 €BMW M502 Engine2.728,00 €BMW E36 320i M50B20 Engine, Premium Grade3.133,00 €BMW M503 Engine4.119,00 €BMW E34 520i M50B20 Complete Engine1.485,00 €
BMW M50B25 Engine1.522,00 €BMW 503 3.2 M503 Complete Engine4.100,00 €BMW 502 2.6 M502 Complete Engine — 2.603,00 €, reduced from 3.200,00 €. It comes from a recorded donor car, and 22 units are available. We can confirm fitment against your VIN the same day.
BMW 503 Coupe M507 Complete Engine — 4.673,00 €, reduced from 5.200,00 €. It comes from a recorded donor car, and 20 units are available. The listing shows every side of the engine and the fitted parts.
BMW E34 525i M50B25 Complete Engine — 1.729,00 €, reduced from 2.300,00 €. It comes from a recorded donor car, and 17 units are available. Ask the desk for compression figures or extra photographs before you order.
BMW M502 Engine — 2.728,00 €, reduced from 3.200,00 €. It comes from a recorded donor car, and 29 units are available. We can confirm fitment against your VIN the same day.
BMW E36 320i M50B20 Engine, Premium Grade — 3.133,00 €, reduced from 3.600,00 €. It comes from a recorded donor car, and 27 units are available. Ask the desk for compression figures or extra photographs before you order.
BMW M503 Engine — 4.119,00 €, reduced from 4.600,00 €. It comes from a recorded donor car, and 8 units are available. We can confirm fitment against your VIN the same day.
BMW E34 520i M50B20 Complete Engine — 1.485,00 €, reduced from 2.000,00 €. It comes from a recorded donor car, and 27 units are available. The listing shows every side of the engine and the fitted parts.
BMW M50B25 Engine — 1.522,00 €, reduced from 1.900,00 €. It comes from a recorded donor car, and 10 units are available. We can confirm fitment against your VIN the same day.
BMW 503 3.2 M503 Complete Engine — 4.100,00 €, reduced from 4.600,00 €. It comes from a recorded donor car, and 25 units are available. We can confirm fitment against your VIN the same day.
Fitting a replacement M50
These are the steps we recommend to every workshop fitting one of our M50 engines.
- Compare the engines side by side. Put the replacement next to the old engine and compare sensors, brackets, connectors, the sump, the starter and the flywheel or flexplate. Note anything that must be transferred.
- Transfer the parts that differ. Move the parts that are specific to your car, such as the engine harness on some models, the sump on xDrive cars or the air conditioning compressor bracket. Use new seals and gaskets for everything you move.
- Replace the rear main seal and drive parts. With the engine out, the rear crankshaft seal is easy to reach. Fit a new one, inspect the flywheel and clutch on manual cars or the converter seal on automatics.
- Renew the cooling system. Most engine failures start with cooling. Fit a new water pump, thermostat and hoses, check the radiator and fan, and use the correct coolant.
- Fit new engine mounts. Old mounts transfer vibration and can let the engine move enough to damage hoses. They are cheap and easy to replace with the engine out.
- Inspect or replace the timing chain parts. Look at the guides and tensioner. On high-mileage engines, replacing them now costs far less than doing it later.
- Clean the intake. If the old engine failed internally, debris can be in the intake or intercooler. Clean them so nothing reaches the new engine.
- Fill with the right oil and prime it. Fill with new oil of the correct specification and a new filter. Crank with the fuel and ignition disabled until oil pressure builds.
- Coding and adaptations. On modern BMWs, the engine ECU must be matched to the car's immobiliser (CAS, FEM or BDC). Reset adaptations, register the battery and clear faults with diagnostic software.
- Reset VANOS adaptations. Clear the VANOS adaptations so the ECU learns the camshaft positions of the new engine.
- First start and leak check. Start the engine, let it idle and watch oil pressure, temperature and fault codes. Check for leaks and bleed the cooling system.
- First 1,000 km. Drive gently for the first few hundred kilometres, vary the engine speed and avoid full load. Change the oil and filter after about 1,000 km to remove any assembly debris.
Tuning and upgrades
Popular moves are an M50 manifold on M52 or S52 engines, a remap and a 2.8 litre stroker using an M52B28 crank. For E30 owners, an M50 swap is one of the most documented upgrades.
Whatever you plan, start with a healthy engine: a compression test, fresh fluids and the known weak parts replaced. Power upgrades amplify any existing problem.
M50 compared with similar BMW engines
Buyers often compare the M50 with these engines. Here is how they line up.
| Engine | Power | Years | Median price in stock |
|---|---|---|---|
| M50 | 100–192 hp | 1954–1996 | 1.805,00 € |
| M54 | 170–231 hp | 2000–2006 | 1.794,00 € |
| M52 | 150–193 hp | 1994–2000 | 1.551,00 € |
| N53 | 190–272 hp | 2007–2013 | 2.114,00 € |
The M54 reaches higher outputs (up to 231 hp against 192 hp) and uses duplex and single chains at the front, no scheduled replacement. Its best-known faults are crankcase ventilation (ccv) and disa valve flap. Read the M54 guide.
The M52 reaches higher outputs (up to 193 hp against 192 hp) and uses duplex lower and single upper chains at the front with hydraulic tensioner. Its best-known faults are nikasil bore wear and cooling system. Read the M52 guide.
The N53 reaches higher outputs (up to 272 hp against 192 hp) and uses timing chain at the front. Its best-known faults are piezo injectors and ignition coils. Read the N53 guide.
Delivery, warranty and payment
Every M50 engine we sell is drained, sealed at each opening, strapped to a heat-treated pallet and shrink-wrapped before it leaves Hamburg. You receive photographs of the packed engine and a tracking number.
Door-to-door delivery is included to the address you give at checkout. Typical delivery takes three to five working days within Germany and neighbouring countries and five to ten working days to the rest of Europe and the UK.
Every engine carries a 12-month warranty on eligible internal failure when a qualified workshop fits it with new fluids and filters. Payment is by card, bank transfer or crypto; your invoice is emailed as soon as you order.
We deliver M50 engines from Hamburg to customers across Europe and beyond. Typical door-to-door times and customs status:
| Country | Typical delivery | Customs and VAT |
|---|---|---|
| Germany | 2–4 working days | No customs; German VAT on the invoice |
| Netherlands | 3–5 working days | EU delivery, no customs |
| Belgium | 3–5 working days | EU delivery, no customs |
| Austria | 3–5 working days | EU delivery, no customs |
| Denmark | 3–5 working days | EU delivery, no customs |
| Poland | 3–6 working days | EU delivery, no customs |
| Czech Republic | 3–6 working days | EU delivery, no customs |
| France | 4–7 working days | EU delivery, no customs |
| Italy | 5–8 working days | EU delivery, no customs |
| Spain | 5–8 working days | EU delivery, no customs |
| Portugal | 6–9 working days | EU delivery, no customs |
| Sweden | 5–8 working days | EU delivery, no customs |
| Norway | 6–10 working days | Export; import VAT and duty in Norway |
| Switzerland | 5–8 working days | Export; import VAT and duty in Switzerland |
| United Kingdom | 5–10 working days | Export; UK import VAT and duty on arrival |
| Ireland | 6–10 working days | EU delivery, no customs |
| United States | Quoted per order | Export; US import duties apply |
| United Arab Emirates | Quoted per order | Export; UAE import duties apply |
Times are typical for pallet delivery after dispatch and can vary with holidays and remote addresses. Business buyers in the EU with a valid VAT number can order without German VAT.
Questions buyers ask about the M50
Will the M50B25 engine fit my BMW E34 525i?
Yes, if your BMW E34 525i was built with the M50B25. BMW used this 2.5 liter (2,494 cc) petrol engine with 141 kW (192 HP) in the E34 525i from about 1990 to 1995.
Some E34 525i cars were built with a different engine: the M20B25. These look alike from the outside, so check the code on your engine or send us your VIN.
Also tell us if your E34 has a manual or an automatic gearbox. The flywheel or the flex plate and some sensors depend on it.
Not sure? Send us your VIN and your gearbox code. We match the engine family, the year window and the parts on the engine before anything is reserved, and the check is free.
See all M50 Engines · Search M50B25 in the shop
How much is a replacement M50B25 engine for a BMW E34 525i?
A used M50B25 for the BMW E34 525i costs from about 1.650 € to 2.700 € in our yard. The price depends on the year, the mileage and the parts that come with the engine.
Shipping is a flat 249 € per order. It is added once at checkout and printed on the invoice, so there is no extra fee later. Inside the EU there is no import duty. Outside the EU, the receiver pays local duty and VAT.
A replacement engine is often much cheaper than rebuilding a damaged one, and much faster. The M50B25 you buy is photographed and checked in Hamburg before it is listed.
Eligible engines come with a 12 months warranty from the delivery date. It covers internal mechanical failure under normal use and correct fitting by a qualified mechanic or workshop. Not sure? Send us your VIN and your gearbox code. We match the engine family, the year window and the parts on the engine before anything is reserved, and the check is free.
See all M50 Engines · Search M50B25 in the shop
Will the M50B25 engine fit my BMW E36 325i?
Yes, if your BMW E36 325i was built with the M50B25. BMW used this 2.5 liter (2,494 cc) petrol engine with 141 kW (192 HP) in the E36 325i from about 1990 to 1995.
In our records the M50B25 is the engine for the E36 325i, which makes the match simple. Still, check the code on your old engine or send us your VIN.
Also tell us if your E36 has a manual or an automatic gearbox. The flywheel or the flex plate and some sensors depend on it.
Not sure? Send us your VIN and your gearbox code. We match the engine family, the year window and the parts on the engine before anything is reserved, and the check is free.
See all M50 Engines · Search M50B25 in the shop
How much is a replacement M50B25 engine for a BMW E36 325i?
A used M50B25 for the BMW E36 325i costs from about 1.650 € to 2.700 € in our yard. The price depends on the year, the mileage and the parts that come with the engine.
Shipping is a flat 249 € per order. It is added once at checkout and printed on the invoice, so there is no extra fee later. Inside the EU there is no import duty. Outside the EU, the receiver pays local duty and VAT.
A replacement engine is often much cheaper than rebuilding a damaged one, and much faster. The M50B25 you buy is photographed and checked in Hamburg before it is listed.
Eligible engines come with a 12 months warranty from the delivery date. It covers internal mechanical failure under normal use and correct fitting by a qualified mechanic or workshop. Not sure? Send us your VIN and your gearbox code. We match the engine family, the year window and the parts on the engine before anything is reserved, and the check is free.
See all M50 Engines · Search M50B25 in the shop
Will the M50B25 engine fit my BMW Z3 2.5?
Yes, if your BMW Z3 2.5 was built with the M50B25. BMW used this 2.5 liter (2,494 cc) petrol engine with 141 kW (192 HP) in the Z3 2.5 from about 1990 to 1995.
In our records the M50B25 is the engine for the Z3 2.5, which makes the match simple. Still, check the code on your old engine or send us your VIN.
Also tell us if your Z3 has a manual or an automatic gearbox. The flywheel or the flex plate and some sensors depend on it.
Not sure? Send us your VIN and your gearbox code. We match the engine family, the year window and the parts on the engine before anything is reserved, and the check is free.
See all M50 Engines · Search M50B25 in the shop
How much is a replacement M50B25 engine for a BMW Z3 2.5?
A used M50B25 for the BMW Z3 2.5 costs from about 1.650 € to 2.700 € in our yard. The price depends on the year, the mileage and the parts that come with the engine.
Shipping is a flat 249 € per order. It is added once at checkout and printed on the invoice, so there is no extra fee later. Inside the EU there is no import duty. Outside the EU, the receiver pays local duty and VAT.
A replacement engine is often much cheaper than rebuilding a damaged one, and much faster. The M50B25 you buy is photographed and checked in Hamburg before it is listed.
Eligible engines come with a 12 months warranty from the delivery date. It covers internal mechanical failure under normal use and correct fitting by a qualified mechanic or workshop. Not sure? Send us your VIN and your gearbox code. We match the engine family, the year window and the parts on the engine before anything is reserved, and the check is free.
See all M50 Engines · Search M50B25 in the shop
Will the M50B20 engine fit my BMW E36 320i?
Yes, if your BMW E36 320i was built with the M50B20. BMW used this 2.0 liter (1,991 cc) petrol engine with 110 kW (150 HP) in the E36 320i from about 1990 to 1995.
In our records the M50B20 is the engine for the E36 320i, which makes the match simple. Still, check the code on your old engine or send us your VIN.
Also tell us if your E36 has a manual or an automatic gearbox. The flywheel or the flex plate and some sensors depend on it.
Not sure? Send us your VIN and your gearbox code. We match the engine family, the year window and the parts on the engine before anything is reserved, and the check is free.
See all M50 Engines · Search M50B20 in the shop
How much is a replacement M50B20 engine for a BMW E36 320i?
A used M50B20 for the BMW E36 320i costs from about 1.300 € to 2.200 € in our yard. The price depends on the year, the mileage and the parts that come with the engine.
Shipping is a flat 249 € per order. It is added once at checkout and printed on the invoice, so there is no extra fee later. Inside the EU there is no import duty. Outside the EU, the receiver pays local duty and VAT.
A replacement engine is often much cheaper than rebuilding a damaged one, and much faster. The M50B20 you buy is photographed and checked in Hamburg before it is listed.
Eligible engines come with a 12 months warranty from the delivery date. It covers internal mechanical failure under normal use and correct fitting by a qualified mechanic or workshop. Not sure? Send us your VIN and your gearbox code. We match the engine family, the year window and the parts on the engine before anything is reserved, and the check is free.
See all M50 Engines · Search M50B20 in the shop
Will the M50B20 engine fit my BMW E34 520i?
Yes, if your BMW E34 520i was built with the M50B20. BMW used this 2.0 liter (1,991 cc) petrol engine with 110 kW (150 HP) in the E34 520i from about 1990 to 1995.
In our records the M50B20 is the engine for the E34 520i, which makes the match simple. Still, check the code on your old engine or send us your VIN.
Also tell us if your E34 has a manual or an automatic gearbox. The flywheel or the flex plate and some sensors depend on it.
Not sure? Send us your VIN and your gearbox code. We match the engine family, the year window and the parts on the engine before anything is reserved, and the check is free.
See all M50 Engines · Search M50B20 in the shop
How much is a replacement M50B20 engine for a BMW E34 520i?
A used M50B20 for the BMW E34 520i costs from about 1.300 € to 2.200 € in our yard. The price depends on the year, the mileage and the parts that come with the engine.
Shipping is a flat 249 € per order. It is added once at checkout and printed on the invoice, so there is no extra fee later. Inside the EU there is no import duty. Outside the EU, the receiver pays local duty and VAT.
A replacement engine is often much cheaper than rebuilding a damaged one, and much faster. The M50B20 you buy is photographed and checked in Hamburg before it is listed.
Eligible engines come with a 12 months warranty from the delivery date. It covers internal mechanical failure under normal use and correct fitting by a qualified mechanic or workshop. Not sure? Send us your VIN and your gearbox code. We match the engine family, the year window and the parts on the engine before anything is reserved, and the check is free.
See all M50 Engines · Search M50B20 in the shop
What is the BMW M50B25 engine?
The BMW M50B25 is a 2.5 liter (2,494 cc) petrol engine from the M50 family. It has an inline 6, DOHC, 24 valve layout with no turbo (naturally aspirated), and makes 141 kW (192 HP) with 245 Nm of torque. BMW built it from 1990 to 1995 and it meets the Euro 1 emission standard.
You find the M50B25 in the BMW E36 325i, BMW E34 525i and BMW Z3 2.5. What we list: BMW M50 24-valve petrol engines for E36 320i and 325i.
At Autowerke Engines every M50B25 is a real used engine from our yard in Hamburg. The photos on each listing show the actual engine, not a stock picture. The yard checks the code, records what is bolted on, and seals the openings before the engine is offered. Each listing shows the year, the mileage and the price, so you can compare units side by side.
Not sure? Send us your VIN and your gearbox code. We match the engine family, the year window and the parts on the engine before anything is reserved, and the check is free.
See all M50 Engines · Search M50B25 in the shop
How much does a used BMW M50B25 engine cost?
A used BMW M50B25 engine in our yard usually costs between 1.650 € and 2.700 €. The exact price depends on the year, the mileage and the parts that come with the engine.
Our units show recorded mileage from about 22,000 km up to around 200,000 km. Lower mileage and more ancillaries mean a higher price. Each listing shows its own price, and the price you see is the price you pay. Prices include VAT for private buyers.
Shipping is a flat 249 € per order. It is added once at checkout and printed on the invoice, so there is no extra fee later. If you order a gearbox or a second engine on the same order, the fee is still charged once.
Inside the EU there is no import duty. For the UK and other non-EU countries, import duty and local VAT are paid by the receiver, and we supply a commercial invoice.
See all M50 Engines · Search M50B25 in the shop
Which cars use the BMW M50B25 engine?
BMW fitted the M50B25 to the BMW E36 325i, BMW E34 525i and BMW Z3 2.5. These cars were built with this engine from about 1990 to 1995.
The badge on the boot is not enough to be sure. The same model name can hide two different engines, for example after a facelift or a change in emission rules. Always read the engine code stamped on the block, or look it up with your VIN.
Other engines in the same M50 family are the M50B20 (150 HP). They look alike but differ in power, parts and electronics, so they are not always a direct swap.
Not sure? Send us your VIN and your gearbox code. We match the engine family, the year window and the parts on the engine before anything is reserved, and the check is free.
See all M50 Engines · Search M50B25 in the shop
How much power and torque does the BMW M50B25 have?
From the factory the BMW M50B25 makes 141 kW (192 HP) and 245 Nm of torque. It is a 2.5 liter (2,494 cc) inline 6, DOHC, 24 valve petrol engine with no turbo (naturally aspirated).
Without a turbo, the power builds smoothly with the revs. A clean air intake, healthy ignition and the correct fuel are key to getting the full figure.
A used engine reaches its factory numbers when it is fitted with the matching engine computer and software, and serviced with the right oil and filters. If the engine computer from your car is a different version, a specialist may need to code it.
Every M50B25 on our site lists its year and mileage. Ask the desk for more pictures of any listing. We are happy to show the stamp, the ports and the ancillaries before you decide.
See all M50 Engines · Search M50B25 in the shop
How do I know a used M50B25 engine is in good shape?
Before a unit is listed, the yard checks the engine code against the listing, writes down the parts fitted to it, seals every opening and photographs the real engine you will receive. An inspection certificate for the unit can travel with the order when you ask for it.
When you look at a listing, check the recorded mileage, the year and the photos of the ports and the stamp. Ask for photos of anything you want to see closer. You can ask for extra photos, a close-up of the code stamp or a short video before you order.
On a petrol engine like the M50B25, a careful fitter will also look at the spark plugs, the coils and the timing side before the engine goes in.
If the engine fails inside under normal use, the warranty covers you. Eligible engines come with a 12 months warranty from the delivery date. It covers internal mechanical failure under normal use and correct fitting by a qualified mechanic or workshop.
See all M50 Engines · Search M50B25 in the shop
What comes with a used M50B25 engine?
Each M50B25 is sold as described on its own listing. The yard writes down the parts that are fitted to that unit, such as the turbo, the injectors, the manifolds or the alternator, so you know what arrives.
Some units are long engines with few ancillaries, others are more complete. If you need a part that is not listed, ask the desk. We often have the matching items in the yard.
Every engine is drained, sealed at each opening, strapped to a heat-treated pallet and shrink-wrapped, then photographed before it leaves the yard.
On delivery, the carrier brings the pallet to the kerb or a loading bay. Please have a forklift, a pallet truck or an engine crane ready.
See all M50 Engines · Search M50B25 in the shop
Is the BMW M50B25 a diesel or petrol engine?
The M50B25 is a petrol engine. It is a 2.5 liter (2,494 cc) inline 6, DOHC, 24 valve unit with no turbo (naturally aspirated), and it was built to the Euro 1 emission standard.
The emission standard matters for registration and for low-emission zones in many cities. When you replace an engine with the same code, the car keeps the same paperwork and the same emission class.
Petrol versions need the correct catalytic converters and oxygen sensors on the car to stay legal and to keep the engine computer happy. Reuse the parts from your car if they are in good condition.
If you are not sure which version you need, send us your VIN. We tell you the right code for free.
See all M50 Engines · Search M50B25 in the shop
What is the difference between the M50B25 and other M50 engines?
The M50B25 makes 141 kW (192 HP) and 245 Nm. The other M50 engines are: M50B20 with 110 kW (150 HP) and 190 Nm (1990 to 1995).
Engines in one family share a basic block, but the turbo, the injection, the sensors and the engine computer can differ. A higher power version often has different pistons, a bigger turbo or a different fuel system.
This is why we ask for the exact code. Fitting a different version can work, but the wiring, the software and sometimes the gearbox must be changed to match.
Not sure? Send us your VIN and your gearbox code. We match the engine family, the year window and the parts on the engine before anything is reserved, and the check is free.
See all M50 Engines · Search M50B25 in the shop
How long does delivery of an M50B25 engine take?
Orders confirmed before 14:00 CET on a working day leave Hamburg the same day. Later and weekend orders leave the next working day. Delivery to the Netherlands, Belgium, Germany, France, Luxembourg and Denmark takes 1 to 3 working days.
Spain, Italy, Portugal, Poland, Czechia, Austria, Ireland, the Nordics and the Baltics take 2 to 5 working days. Greek and Spanish islands, Malta, Cyprus and remote areas take 4 to 8 working days. The UK and other countries outside the EU are quoted one by one.
Shipping is a flat 249 € per order. It is added once at checkout and printed on the invoice, so there is no extra fee later. Every engine is drained, sealed at each opening, strapped to a heat-treated pallet and shrink-wrapped, then photographed before it leaves the yard.
You get a tracking number when the pallet is collected. Check the wrapping before you sign, and note any damage on the paperwork.
See all M50 Engines · Search M50B25 in the shop
What should I replace when I fit a used M50B25 engine?
A used engine lasts longest when it starts life in your car with fresh fluids and new seals. Fit a new oil filter and fresh oil of the grade BMW lists for this engine, and refill the coolant with the correct BMW antifreeze mix. Change the drive belt, the thermostat and the water pump seals if they look tired, because they are cheap while the engine is out. Use new gaskets for the exhaust manifold, the intake and the sump plug, and check every hose clip before the first start.
Look at the engine mounts and the clutch or the torque converter while the engine is out. Old mounts can crack a new engine's brackets, and a worn clutch is much easier to change now.
Before the first start, turn the engine over without fuel until the oil pressure light goes out. Then let it idle, check for leaks, and drive gently for the first few hundred kilometres.
The warranty asks for fitting by a qualified mechanic and the correct oil, coolant and filters. Keep your receipts in case you ever need to make a claim.
See all M50 Engines · Search M50B25 in the shop
Does a used M50B25 engine come with a warranty?
Yes. Eligible engines come with a 12 months warranty from the delivery date. It covers internal mechanical failure under normal use and correct fitting by a qualified mechanic or workshop.
The warranty does not cover damage from wrong fitting, overheating, low oil, wrong fluids or fuel, engines that were opened or modified without our approval, or labour and towing costs.
To claim, send us your order number, a short description of the problem, photos or a video, and a mechanic's report if we ask for one. If the claim is approved, we repair, replace or refund the engine.
Keep the receipts for the fitting, the oil and the filters. They make any claim quick and simple.
See all M50 Engines · Search M50B25 in the shop
Can you check if an M50B25 fits my car with my VIN?
Yes, and it is free. Send the 17-character VIN of your car and, if you have it, the gearbox code. We check the engine family, the build year window and the parts your car needs.
For the M50B25, we confirm that your car was built with this code or with a version that can take it. BMW used it in the BMW E36 325i, BMW E34 525i and BMW Z3 2.5.
We only reserve an engine once the match is confirmed, so you never pay for the wrong unit. You can reach the Hamburg desk by email at autowerkeengines@gmail.com, or by phone and WhatsApp on +49 15510 030835, Monday to Friday, 9:00 to 16:00 CET.
You can also use the VIN check on our site. It reads the year, the make, the model and the engine from the public vehicle register.
See all M50 Engines · Search M50B25 in the shop
What is the BMW M50B20 engine?
The BMW M50B20 is a 2.0 liter (1,991 cc) petrol engine from the M50 family. It has an inline 6, DOHC, 24 valve layout with no turbo (naturally aspirated), and makes 110 kW (150 HP) with 190 Nm of torque. BMW built it from 1990 to 1995 and it meets the Euro 1 emission standard.
You find the M50B20 in the BMW E36 320i and BMW E34 520i. What we list: BMW M50 24-valve petrol engines for E36 320i and 325i.
At Autowerke Engines every M50B20 is a real used engine from our yard in Hamburg. Before a unit is listed, the yard checks the engine code against the listing, writes down the parts fitted to it, seals every opening and photographs the real engine you will receive. Each listing shows the year, the mileage and the price, so you can compare units side by side.
Not sure? Send us your VIN and your gearbox code. We match the engine family, the year window and the parts on the engine before anything is reserved, and the check is free.
See all M50 Engines · Search M50B20 in the shop
How much does a used BMW M50B20 engine cost?
A used BMW M50B20 engine in our yard usually costs between 1.300 € and 2.200 €. The exact price depends on the year, the mileage and the parts that come with the engine.
Our units show recorded mileage from about 22,000 km up to around 200,000 km. Lower mileage and more ancillaries mean a higher price. Each listing shows its own price, and the price you see is the price you pay. Prices include VAT for private buyers.
Shipping is a flat 249 € per order. It is added once at checkout and printed on the invoice, so there is no extra fee later. If you order a gearbox or a second engine on the same order, the fee is still charged once.
Inside the EU there is no import duty. For the UK and other non-EU countries, import duty and local VAT are paid by the receiver, and we supply a commercial invoice.
See all M50 Engines · Search M50B20 in the shop
Which cars use the BMW M50B20 engine?
BMW fitted the M50B20 to the BMW E36 320i and BMW E34 520i. These cars were built with this engine from about 1990 to 1995.
The badge on the boot is not enough to be sure. The same model name can hide two different engines, for example after a facelift or a change in emission rules. Always read the engine code stamped on the block, or look it up with your VIN.
Other engines in the same M50 family are the M50B25 (192 HP). They look alike but differ in power, parts and electronics, so they are not always a direct swap.
Not sure? Send us your VIN and your gearbox code. We match the engine family, the year window and the parts on the engine before anything is reserved, and the check is free.
See all M50 Engines · Search M50B20 in the shop
How much power and torque does the BMW M50B20 have?
From the factory the BMW M50B20 makes 110 kW (150 HP) and 190 Nm of torque. It is a 2.0 liter (1,991 cc) inline 6, DOHC, 24 valve petrol engine with no turbo (naturally aspirated).
Without a turbo, the power builds smoothly with the revs. A clean air intake, healthy ignition and the correct fuel are key to getting the full figure.
A used engine reaches its factory numbers when it is fitted with the matching engine computer and software, and serviced with the right oil and filters. If the engine computer from your car is a different version, a specialist may need to code it.
Every M50B20 on our site lists its year and mileage. If you want more photos or a short video of a unit, ask the desk and we send them before you pay.
See all M50 Engines · Search M50B20 in the shop
How do I know a used M50B20 engine is in good shape?
The photos on each listing show the actual engine, not a stock picture. The yard checks the code, records what is bolted on, and seals the openings before the engine is offered. An inspection certificate for the unit can travel with the order when you ask for it.
When you look at a listing, check the recorded mileage, the year and the photos of the ports and the stamp. Ask for photos of anything you want to see closer. Ask the desk for more pictures of any listing. We are happy to show the stamp, the ports and the ancillaries before you decide.
On a petrol engine like the M50B20, a careful fitter will also look at the spark plugs, the coils and the timing side before the engine goes in.
If the engine fails inside under normal use, the warranty covers you. Eligible engines come with a 12 months warranty from the delivery date. It covers internal mechanical failure under normal use and correct fitting by a qualified mechanic or workshop.
See all M50 Engines · Search M50B20 in the shop
What comes with a used M50B20 engine?
Each M50B20 is sold as described on its own listing. The yard writes down the parts that are fitted to that unit, such as the turbo, the injectors, the manifolds or the alternator, so you know what arrives.
Some units are long engines with few ancillaries, others are more complete. If you need a part that is not listed, ask the desk. We often have the matching items in the yard.
Every engine is drained, sealed at each opening, strapped to a heat-treated pallet and shrink-wrapped, then photographed before it leaves the yard.
On delivery, the carrier brings the pallet to the kerb or a loading bay. Please have a forklift, a pallet truck or an engine crane ready.
See all M50 Engines · Search M50B20 in the shop
Is the BMW M50B20 a diesel or petrol engine?
The M50B20 is a petrol engine. It is a 2.0 liter (1,991 cc) inline 6, DOHC, 24 valve unit with no turbo (naturally aspirated), and it was built to the Euro 1 emission standard.
The emission standard matters for registration and for low-emission zones in many cities. When you replace an engine with the same code, the car keeps the same paperwork and the same emission class.
Petrol versions need the correct catalytic converters and oxygen sensors on the car to stay legal and to keep the engine computer happy. Reuse the parts from your car if they are in good condition.
If you are not sure which version you need, send us your VIN. We tell you the right code for free.
See all M50 Engines · Search M50B20 in the shop
What is the difference between the M50B20 and other M50 engines?
The M50B20 makes 110 kW (150 HP) and 190 Nm. The other M50 engines are: M50B25 with 141 kW (192 HP) and 245 Nm (1990 to 1995).
Engines in one family share a basic block, but the turbo, the injection, the sensors and the engine computer can differ. A higher power version often has different pistons, a bigger turbo or a different fuel system.
This is why we ask for the exact code. Fitting a different version can work, but the wiring, the software and sometimes the gearbox must be changed to match.
Not sure? Send us your VIN and your gearbox code. We match the engine family, the year window and the parts on the engine before anything is reserved, and the check is free.
See all M50 Engines · Search M50B20 in the shop
How long does delivery of an M50B20 engine take?
Orders confirmed before 14:00 CET on a working day leave Hamburg the same day. Later and weekend orders leave the next working day. Delivery to the Netherlands, Belgium, Germany, France, Luxembourg and Denmark takes 1 to 3 working days.
Spain, Italy, Portugal, Poland, Czechia, Austria, Ireland, the Nordics and the Baltics take 2 to 5 working days. Greek and Spanish islands, Malta, Cyprus and remote areas take 4 to 8 working days. The UK and other countries outside the EU are quoted one by one.
Shipping is a flat 249 € per order. It is added once at checkout and printed on the invoice, so there is no extra fee later. Every engine is drained, sealed at each opening, strapped to a heat-treated pallet and shrink-wrapped, then photographed before it leaves the yard.
You get a tracking number when the pallet is collected. Check the wrapping before you sign, and note any damage on the paperwork.
See all M50 Engines · Search M50B20 in the shop
What should I replace when I fit a used M50B20 engine?
A used engine lasts longest when it starts life in your car with fresh fluids and new seals. Fit a new oil filter and fresh oil of the grade BMW lists for this engine, and refill the coolant with the correct BMW antifreeze mix. Check the spark plugs and the ignition coils, and make sure the fuel lines are clean and tight before you crank the engine. Change the drive belt, the thermostat and the water pump seals if they look tired, because they are cheap while the engine is out.
Look at the engine mounts and the clutch or the torque converter while the engine is out. Old mounts can crack a new engine's brackets, and a worn clutch is much easier to change now.
Before the first start, turn the engine over without fuel until the oil pressure light goes out. Then let it idle, check for leaks, and drive gently for the first few hundred kilometres.
The warranty asks for fitting by a qualified mechanic and the correct oil, coolant and filters. Keep your receipts in case you ever need to make a claim.
See all M50 Engines · Search M50B20 in the shop
Does a used M50B20 engine come with a warranty?
Yes. Eligible engines come with a 12 months warranty from the delivery date. It covers internal mechanical failure under normal use and correct fitting by a qualified mechanic or workshop.
The warranty does not cover damage from wrong fitting, overheating, low oil, wrong fluids or fuel, engines that were opened or modified without our approval, or labour and towing costs.
To claim, send us your order number, a short description of the problem, photos or a video, and a mechanic's report if we ask for one. If the claim is approved, we repair, replace or refund the engine.
Keep the receipts for the fitting, the oil and the filters. They make any claim quick and simple.
See all M50 Engines · Search M50B20 in the shop
Can you check if an M50B20 fits my car with my VIN?
Yes, and it is free. Send the 17-character VIN of your car and, if you have it, the gearbox code. We check the engine family, the build year window and the parts your car needs.
For the M50B20, we confirm that your car was built with this code or with a version that can take it. BMW used it in the BMW E36 320i and BMW E34 520i.
We only reserve an engine once the match is confirmed, so you never pay for the wrong unit. You can reach the Hamburg desk by email at autowerkeengines@gmail.com, or by phone and WhatsApp on +49 15510 030835, Monday to Friday, 9:00 to 16:00 CET.
You can also use the VIN check on our site. It reads the year, the make, the model and the engine from the public vehicle register.
See all M50 Engines · Search M50B20 in the shop
What is the difference between the BMW M50 engines?
BMW M50 24-valve petrol engines for E36 320i and 325i. We list 2 versions: M50B25 (2.5 liter (2,494 cc), 141 kW (192 HP), 1990 to 1995); M50B20 (2.0 liter (1,991 cc), 110 kW (150 HP), 1990 to 1995).
The versions share the same basic design, but the power, the turbo or injection set-up, the electronics and the emission standard change. The right one for you is the one your car was built with.
The M50 family was used in chassis E36, E34 and Z3. Each engine in the yard is inspected in Hamburg. The code is matched to the listing, the parts on the engine are recorded, the openings are sealed and the real unit is photographed.
Not sure? Send us your VIN and your gearbox code. We match the engine family, the year window and the parts on the engine before anything is reserved, and the check is free.
What should I check on a used BMW M50 engine?
Start with the basics: the engine code on the block, the recorded mileage and the photos. Make sure the code matches your car and the parts you need are on the unit.
On an M50 petrol engine, a fitter usually checks the spark plugs, the coils, the timing side and the oil seals. These parts are easy to check before fitting and easy to change if needed.
You can ask for extra photos, a close-up of the code stamp or a short video before you order. An inspection certificate can travel with the order on request.
Once fitted, change the oil and filter early and drive gently at first. Report any problem right away so the warranty stays valid.
See all M50 Engines · Inspection certificate
Which years were BMW M50 engines made?
BMW built the M50 engines we list from about 1990 to 1995. The M50B25 ran from 1990 to 1995. The M50B20 ran from 1990 to 1995.
They went into chassis E36, E34 and Z3. The exact year of a car matters, because BMW sometimes changed the engine version or its parts in the middle of a model's life.
Each listing in our yard names the engine year, so you can match it to the build date of your car.
Not sure? Send us your VIN and your gearbox code. We match the engine family, the year window and the parts on the engine before anything is reserved, and the check is free.
Glossary
- VANOS — BMW's variable camshaft timing system. It adjusts the intake camshaft (single VANOS) or both camshafts (double VANOS) to improve torque and emissions.
- Long block — An engine with the block, head and internals but without most ancillaries such as manifolds, turbo, alternator or starter.
- Dressed engine — An engine with most ancillaries fitted, ready to install with fewer parts transferred.
- Compression test — A measurement of the pressure each cylinder builds when cranked. Even readings show healthy rings and valves.
- Leak-down test — A test that pressurises each cylinder and measures how much air escapes, showing where any leak is.
- LCI — Life Cycle Impulse, BMW's name for a mid-life update. Engines often change at the LCI.
- xDrive — BMW's all-wheel-drive system. xDrive cars often use a different sump and oil pickup.
- DME — Digital Motor Electronics, BMW's name for the engine control unit.
- CAS, FEM and BDC — The immobiliser and body modules that must be matched to the engine control unit on modern BMWs.
- Timing chain tensioner — A hydraulic or spring device that keeps the timing chain tight. Worn tensioners cause cold-start rattle.
- TU — Technical Update, BMW's suffix for a revised version of an engine.
Our verdict
The M50 rewards owners who understand it. Check the code against your VIN, ask for compression figures and photographs, replace the known weak parts while the engine is out, and fit it with fresh fluids and filters. Do that and a used M50 will give years of service.
Ready to order, or need help choosing? Browse every M50 in stock, contact the Hamburg desk or send us your VIN on WhatsApp.
