The M43B18 is a 1.8 L petrol inline-4 from BMW's M43 family, built 1993–2001 and rated at 115 hp and 168 Nm. It powered the BMW E36 318i and BMW E34 518i.
This guide is about the M43B18 specifically: its specification, the cars that use it, how it differs from the other M43 versions, what to check, prices from our stock and fitment answers for each model. For the history of the whole family, read our M43 guide.
- Capacity and layout: 1.8 L, inline-4, naturally aspirated
- Output: 115 hp and 168 Nm
- Production: 1993–2001
- Fitted to: 2 models across 2 chassis generations
- In our stock: ask the desk for the next arrival
M43B18 specifications
| Item | Value |
|---|---|
| Engine code | M43B18 |
| Family | M43 |
| Capacity | 1.8 L |
| Layout | Inline-4 |
| Fuel | Petrol |
| Aspiration | Naturally aspirated |
| Power | 115 hp |
| Torque | 168 Nm |
| Specific output | 64 hp per litre |
| Production | 1993–2001 |
| Models | 2 |
The M43B18 is a 1.8 L inline-4 petrol engine, naturally aspirated, rated at 115 hp and 168 Nm. BMW built it from 1993 to 2001. That is about 64 hp and 93 Nm per litre, a relaxed tune aimed at torque, durability and economy. Within the M43 family, the M43B19 (118 hp) is more powerful, while the M43B16 (102 hp) is milder. It was fitted to the BMW E36 318i and BMW E34 518i.
What the code M43B18 means
- M marks an M-series code, the naming BMW used for its engine families up to the early 2000s.
- 43 is the family number.
- B stands for petrol (from the German Benzin).
- 18 is the capacity in decilitres, so 1.8 litres.
Which BMW models use the M43B18
| Model | Generation | Built |
|---|---|---|
| BMW E36 318i | third 3 Series | 1990–2000 |
| BMW E34 518i | third 5 Series | 1988–1996 |
In the E36 third 3 Series (1990–2000), the M43B18 powered the 318i. Engines from other models fit the E36 as long as the sump, mounts and ancillaries match, which we check against your VIN. All E36 engines
In the E34 third 5 Series (1988–1996), the M43B18 powered the 518i. Engines from other models fit the E34 as long as the sump, mounts and ancillaries match, which we check against your VIN. All E34 engines
M43B18 compared with other M43 versions
| Code | Capacity | Power | Torque | Years |
|---|---|---|---|---|
| M43B16 | 1.6 L | 102 hp | 150 Nm | 1993–2002 |
| M43B18 | 1.8 L | 115 hp | 168 Nm | 1993–2001 |
| M43B19 | 1.9 L | 118 hp | 180 Nm | 1998–2002 |
M43B18 or M43B19?
The M43B19 has 3 hp more than the M43B18 (118 against 115 hp), from 1.9 L instead of 1.8 L, and was built 1998–2002. A different capacity means a different crankshaft, pistons or head, and different software. It can be fitted as an upgrade with the matching engine control unit and wiring, but it is a conversion rather than a straight replacement.
M43B18 or M43B16?
The M43B16 has 13 hp less than the M43B18 (102 against 115 hp), from 1.6 L instead of 1.8 L, and was built 1993–2002. A different capacity means a different crankshaft, pistons or head, and different software. It can be fitted as an upgrade with the matching engine control unit and wiring, but it is a conversion rather than a straight replacement.
Common M43B18 problems
The M43B18 shares its weak points with the rest of the M43 family. These are the faults to check on a used unit and on your own engine. The full explanation of each is in the M43 guide.
| Known fault | What to check |
|---|---|
| Timing chain guide rail | Remove the valve cover and inspect the top of the guide; replace it when fitting any used M43. |
| Valve cover gasket leaks | Look for burnt oil on the exhaust side. |
| Ticking hydraulic lifters | Listen after the engine has warmed; noise that stays is a lifter problem. |
| Engine mounts and vibration | Check mounts for split rubber when the engine is in the car. |
Timing chain guide rail. The M43's plastic guide rail can crack and break, which lets the chain slap and in the worst case jump. It is the single most important check on this engine.
M43B18 maintenance
- 5W-40 or 10W-40 synthetic, about 4.25 litres with filter.
- Oil every 10,000 to 15,000 km; inspect the chain guide whenever the valve cover is removed.
- Single-row timing chain with a plastic guide rail and hydraulic tensioner.
Will the M43B18 fit my car?
Will the M43B18 fit my BMW E34 518i?
Yes, the BMW E34 518i left the factory with the M43B18, so an M43B18 from another car is the direct replacement. The third 5 Series was built 1988–1996, and the M43B18 was produced 1993–2001, 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 518i?
We do not have an M43B18 on the shelf for the E34 518i at the moment. Units arrive regularly; send us your VIN and we will tell you when the next one is ready and what it will cost, including delivery.
M43B18 prices
We do not have an M43B18 on the shelf at the moment. Send us your VIN or the code you need and the desk will tell you when the next unit arrives and what it will cost.
Buying a used M43B18: checklist
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
Questions about the M43B18
What is the BMW M43B18 engine?
The BMW M43B18 is a 1.8 liter (1,796 cc) petrol engine from the M43 family. It has an inline 4, SOHC, 8 valve layout with no turbo (naturally aspirated), and makes 85 kW (115 HP) with 168 Nm of torque. BMW built it from 1993 to 2001 and it meets the Euro 2 emission standard.
You find the M43B18 in the BMW E36 318i, BMW E46 318i and BMW E36 Compact 316i. What we list: BMW M43 1.6 and 1.8 petrol engines for E36 and E46.
At Autowerke Engines every M43B18 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 M43 Engines · Search M43B18 in the shop
How long does delivery of an M43B18 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 M43 Engines · Search M43B18 in the shop
How much is a replacement M43B18 engine for a BMW E36 318i?
A used M43B18 for the BMW E36 318i costs from about 800 € to 1.450 € 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 M43B18 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 M43 Engines · Search M43B18 in the shop
How do I know a used M43B18 engine is in good shape?
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. 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 M43B18, 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 M43 Engines · Search M43B18 in the shop
How much power and torque does the BMW M43B18 have?
From the factory the BMW M43B18 makes 85 kW (115 HP) and 168 Nm of torque. It is a 1.8 liter (1,796 cc) inline 4, SOHC, 8 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 M43B18 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 M43 Engines · Search M43B18 in the shop
How much does a used BMW M43B18 engine cost?
A used BMW M43B18 engine in our yard usually costs between 800 € and 1.450 €. 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 M43 Engines · Search M43B18 in the shop
How much is a replacement M43B18 engine for a BMW E36 Compact 316i?
A used M43B18 for the BMW E36 Compact 316i costs from about 800 € to 1.450 € 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 M43B18 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 M43 Engines · Search M43B18 in the shop
Will the M43B18 engine fit my BMW E36 318i?
Yes, if your BMW E36 318i was built with the M43B18. BMW used this 1.8 liter (1,796 cc) petrol engine with 85 kW (115 HP) in the E36 318i from about 1993 to 2001.
Some E36 318i cars were built with a different engine: the M40B18 and M42B18. These look alike from the outside, so check the code on your 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 M43 Engines · Search M43B18 in the shop
Will the M43B18 engine fit my BMW E46 318i?
Yes, if your BMW E46 318i was built with the M43B18. BMW used this 1.8 liter (1,796 cc) petrol engine with 85 kW (115 HP) in the E46 318i from about 1993 to 2001.
Some E46 318i cars were built with a different engine: the N46B20. These look alike from the outside, so check the code on your engine or send us your VIN.
Also tell us if your E46 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 M43 Engines · Search M43B18 in the shop
Are there other versions of the BMW M43B18?
In our yard the M43B18 is the only listed version of the M43 family. It makes 85 kW (115 HP) and 168 Nm, and was built from 1993 to 2001.
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 M43 Engines · Search M43B18 in the shop
Will the M43B18 engine fit my BMW E36 Compact 316i?
Yes, if your BMW E36 Compact 316i was built with the M43B18. BMW used this 1.8 liter (1,796 cc) petrol engine with 85 kW (115 HP) in the E36 Compact 316i from about 1993 to 2001.
In our records the M43B18 is the engine for the E36 Compact 316i, 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 M43 Engines · Search M43B18 in the shop
What should I replace when I fit a used M43B18 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 M43 Engines · Search M43B18 in the shop
Which cars use the BMW M43B18 engine?
BMW fitted the M43B18 to the BMW E36 318i, BMW E46 318i and BMW E36 Compact 316i. These cars were built with this engine from about 1993 to 2001.
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.
The M43B18 is the only M43 version we list, which makes it easy to pick, but the wiring and the engine computer still need to match 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.
See all M43 Engines · Search M43B18 in the shop
Does a used M43B18 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 M43 Engines · Search M43B18 in the shop
How much is a replacement M43B18 engine for a BMW E46 318i?
A used M43B18 for the BMW E46 318i costs from about 800 € to 1.450 € 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 M43B18 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 M43 Engines · Search M43B18 in the shop
Can you check if an M43B18 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 M43B18, 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 318i, BMW E46 318i and BMW E36 Compact 316i.
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 M43 Engines · Search M43B18 in the shop
Is the BMW M43B18 a diesel or petrol engine?
The M43B18 is a petrol engine. It is a 1.8 liter (1,796 cc) inline 4, SOHC, 8 valve unit with no turbo (naturally aspirated), and it was built to the Euro 2 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 M43 Engines · Search M43B18 in the shop
What comes with a used M43B18 engine?
Each M43B18 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 M43 Engines · Search M43B18 in the shop
Delivery, warranty and payment
Before an M43B18 leaves our Hamburg yard it is drained of oil and coolant, every opening is sealed, and it is strapped to a pallet and wrapped. We send photographs of the packed unit and the tracking details.
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.
