BMW S14 engine: the complete buyer's guide

The S14 is the four-cylinder racing engine that made the E30 M3 a touring-car legend. With individual throttle bodies and a red line near 7,000 rpm, it has a character no later four-cylinder BMW has matched.

Units are rare and expensive. Buyers are restorers of E30 M3s, historic racers and collectors. Originality, documentation and internal condition are everything.

• Production: 1986–1991
• Versions covered: S14B20 and S14B23
• Output range: 192–200 hp
• Fuel and layout: petrol inline-4
• Fitted to: 4 BMW models across 1 chassis generations
• In our stock now: ask the desk for the next arrival — browse all S14 engines

The S14 at a glance

The table lists every S14 version we supply with its capacity, layout, output and production years. Use it with your car's engine code to find the right unit.

Across 2 versions, output runs from 192 to 200 hp. The spread reflects different capacities, tuning for different markets and the technical updates BMW made over 6 years of production.

History of the S14

BMW Motorsport built the S14 from 1986 to 1991, combining an M10-derived block with a four-valve head derived from the M88. It came as 2.3 litres (195 to 215 hp), the 2.3 Evo and the 2.5 Sport Evolution with 238 hp. Group A versions went far higher.

1986: the S14B20 arrived with 2.0 L and 192 hp in the BMW E30 320iS and BMW E30 320is.

1986: the S14B23 arrived with 2.3 L and 200 hp in the BMW E30 M3 and BMW E30 M3 Evolution. Compared with the S14B20, it added 8 hp.

Every S14 version explained

S14B20 (2.0 L, 192 hp)

S14B20: 2.0 L, inline-4, petrol, naturally aspirated. Output is 192 hp with 210 Nm of torque, and production ran from 1986 to 1991. That is about 96 hp and 105 Nm per litre, a strong figure for a road engine of its era. Within the S14 family, the S14B23 (200 hp) is more powerful. It was fitted to the BMW E30 320iS and BMW E30 320is.

Reading the code: S marks an S-series code, reserved for engines developed by BMW M; 14 is the family number; B stands for petrol (from the German Benzin); 20 is the capacity in decilitres, so 2.0 litres.

S14B23 (2.3 L, 200 hp)

S14B23: 2.3 L, inline-4, petrol, naturally aspirated. Output is 200 hp with 240 Nm of torque, and production ran from 1986 to 1991. That is about 87 hp and 104 Nm per litre, a strong figure for a road engine of its era. Within the S14 family, it is the most powerful version, while the S14B20 (192 hp) is milder. It was fitted to the BMW E30 M3 and BMW E30 M3 Evolution.

Reading the code: S marks an S-series code, reserved for engines developed by BMW M; 14 is the family number; B stands for petrol (from the German Benzin); 23 is the capacity in decilitres, so 2.3 litres.

Which cars use the S14

The S14 was fitted to 4 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.

BMW E30 second 3 Series (1982–1994)

In the second 3 Series, built 1982–1994 as a saloon, Touring, coupé, convertible, the S14 powered the 320iS (S14B20, 192 hp), 320is (S14B20, 192 hp), M3 (S14B23, 200 hp) and M3 Evolution (S14B23, 200 hp).

For an E30, confirm the production date as well as the model: BMW often changed engine versions at the mid-life update. All E30 engines in stock.

The M3 uses the S14B23. BMW M3 engines for sale.

The M3 Evolution uses the S14B23. BMW M3 engines for sale.

Will an S14 fit my BMW? Model-by-model answers

Short answers for every model that left the factory with an S14, with prices from our current stock.

Will the S14B20 fit my BMW E30 320iS?

Yes, the BMW E30 320iS left the factory with the S14B20, so an S14B20 from another car is the direct replacement. The second 3 Series was built 1982–1994, and the S14B20 was produced 1986–1991, 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 E30 320iS?

We do not have an S14B20 on the shelf for the E30 320iS 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.

Will the S14B20 fit my BMW E30 320is?

The S14B20 is the original engine for the BMW E30 320is, which makes it the straightforward choice. The second 3 Series was built 1982–1994, and the S14B20 was produced 1986–1991, 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 E30 320is?

We do not have an S14B20 on the shelf for the E30 320is 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.

S14 model-year guide

Use this year-by-year guide to see which S14 versions were in production when your car was built.

1986 — S14B20 and S14B23 were in production. New this year: S14B20 and S14B23.

1987 — S14B20 and S14B23 were in production.

1988 — S14B20 and S14B23 were in production.

1989 — S14B20 and S14B23 were in production.

1990 — S14B20 and S14B23 were in production.

1991 — S14B20 and S14B23 were in production. Last year for S14B20 and S14B23.

Common S14 problems and what to check

No engine is perfect. These are the faults our workshop sees most often on the S14, what causes them and how to check a used unit before you buy.

Valve clearances

The S14 uses shims under buckets; clearances need checking regularly, and tight valves burn.

How to check: Ask for the last clearance check and a leak-down test.

Timing chain and guides

Chain wear and guide rail wear are common on high-mileage or track engines.

How to check: Inspect guides and listen for a cold-start rattle.

Throttle body linkage

Wear in the ITB linkage causes uneven idle and poor response.

How to check: Check for free play and even opening across the four throttles.

Bearing wear on track engines

Hard use wears the rod bearings.

How to check: Look at the oil analysis or open the sump on unknown engines.

Diagnosing a failing S14: 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 S14 is the better route.

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.

Oil pressure warning or bearing noise at high revs. On M engines, a warning at high revs can be the first sign of bearing wear. Check the oil level and stop driving hard until it is diagnosed.

Repair or replace your S14?

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 S14 are damaged, a used engine is usually cheaper and quicker than a rebuild.

M engines are expensive to rebuild because parts are costly and specialist labour is needed. A used M engine with documented bearings is often the better value for road cars.

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.

S14 maintenance and running costs

Keep the engine number and documentation together; matching numbers add value on an E30 M3.

The single best thing you can do for an S14 is to change the oil more often than the longest factory interval. Clean oil protects bearings, chains, VANOS units and turbochargers, and costs far less than any of them.

Buying a used S14: the full checklist

Work through these points before you order a used S14, whoever you buy from.

1. 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.
2. 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.
3. 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.
4. 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.
5. 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.
6. 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.
7. 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.
8. 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.
9. 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.
10. 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.
11. 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.
12. Bearing and valve clearance history. M engines are built to tighter tolerances. Ask for the last rod bearing replacement and valve clearance check, and consider an oil analysis if the engine can be run.
13. Originality and numbers. For collectible cars, the engine number and correct ancillaries add value. Photograph the stamp and keep it with the car's documents.

S14 prices: what you should pay

We do not have an S14 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.

S14 engines in stock now

Fitting a replacement S14

These are the steps we recommend to every workshop fitting one of our S14 engines.

1. 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.
2. 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.
3. 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.
4. 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.
5. 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.
6. 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.
7. 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.
8. 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.
9. 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.
10. 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.
11. 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

Builds take the S14 to 2.5 litres and beyond with motorsport camshafts and pistons. For originality, most collectors keep it standard.

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.

S14 compared with similar BMW engines

Buyers often compare the S14 with these engines. Here is how they line up.

The B48 and B46 reaches higher outputs (up to 258 hp against 200 hp) and uses timing chain at the rear (gearbox end). Its best-known faults are coolant leaks and oil filter housing gasket. Read the B48 and B46 guide.

The M20 is milder (up to 170 hp against 200 hp) and uses rubber timing belt with tensioner, changed with the water pump every 60,000 km or four years. Its best-known faults are timing belt failure and cylinder head cracks. Read the M20 guide.

The S55 reaches higher outputs (up to 431 hp against 200 hp) and uses timing chain at the front. Its best-known faults are crank hub and charge pipe. Read the S55 guide.

Delivery, warranty and payment

Before an S14 engine 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.

Delivery is door to door and included in the price. Most European addresses receive the engine within five to ten working days; Germany and its neighbours are usually faster.

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 S14 engines from Hamburg to customers across Europe and beyond. Typical door-to-door times and customs status:

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 S14

Will the S14B23 engine fit my BMW E30 M3?

Yes, if your BMW E30 M3 was built with the S14B23. BMW used this 2.3 liter (2,302 cc) petrol engine with 147 kW (200 HP) in the E30 M3 from about 1986 to 1991.

In our records the S14B23 is the engine for the E30 M3, which makes the match simple. Still, check the code on your old engine or send us your VIN.

Also tell us if your E30 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 S14 Engines · Search S14B23 in the shop

How much is a replacement S14B23 engine for a BMW E30 M3?

A used S14B23 for the BMW E30 M3 costs from about 5.850 € to 8.950 € 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 S14B23 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 S14 Engines · Search S14B23 in the shop

Will the S14B23 engine fit my BMW E30 M3 Evolution?

Yes, if your BMW E30 M3 Evolution was built with the S14B23. BMW used this 2.3 liter (2,302 cc) petrol engine with 147 kW (200 HP) in the E30 M3 Evolution from about 1986 to 1991.

In our records the S14B23 is the engine for the E30 M3 Evolution, which makes the match simple. Still, check the code on your old engine or send us your VIN.

Also tell us if your E30 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 S14 Engines · Search S14B23 in the shop

How much is a replacement S14B23 engine for a BMW E30 M3 Evolution?

A used S14B23 for the BMW E30 M3 Evolution costs from about 5.850 € to 8.950 € 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 S14B23 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 S14 Engines · Search S14B23 in the shop

Will the S14B23 engine fit my BMW E30 M3 Sport Evolution?

Yes, if your BMW E30 M3 Sport Evolution was built with the S14B23. BMW used this 2.3 liter (2,302 cc) petrol engine with 147 kW (200 HP) in the E30 M3 Sport Evolution from about 1986 to 1991.

In our records the S14B23 is the engine for the E30 M3 Sport Evolution, which makes the match simple. Still, check the code on your old engine or send us your VIN.

Also tell us if your E30 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 S14 Engines · Search S14B23 in the shop

How much is a replacement S14B23 engine for a BMW E30 M3 Sport Evolution?

A used S14B23 for the BMW E30 M3 Sport Evolution costs from about 5.850 € to 8.950 € 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 S14B23 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 S14 Engines · Search S14B23 in the shop

Will the SR20DET engine fit my Nissan 200SX S14?

Yes, if your Nissan 200SX S14 was built with the SR20DET. Nissan used this 2.0 liter (1,998 cc) petrol engine with 184 kW (250 HP) in the 200SX S14 from about 1994 to 1998.

Check the engine code on your old block, or send us your VIN. Cars sold in different countries or years can have a different engine under the same name.

Also tell us whether your car has a manual or an automatic gearbox, and two or four-wheel drive. The flywheel, the sump and some brackets can change with these.

A used SR20DET costs about 3.150 € to 4.450 € in our yard, plus 249 € shipping per order. 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 SR20 Engines · Search SR20DET in the shop

Can I put an RB26DETT engine in my 240SX S14?

Yes. We sell conversion kits that fit the RB26DETT into the 240SX S14. The kit replaces the RB20, RB25 and KA24, and works with the FS5R30 and Getrag V160.

You can buy the full package with an engine, or only the parts you need: complete conversion with engine, complete conversion, adapter plate, engine mount, wiring and ecu and cooling and exhaust.

A swap like this needs a skilled workshop. Mounts, the adapter, the wiring and the engine computer, the cooling and the exhaust all have to work together. Check your local road rules for engine swaps before you start.

Tell us your 240SX S14's year and current set-up, and we suggest the right parts. 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.

See all RB26 Skyline Conversion Kits · Conversion guide

What is the BMW S14B23 engine?

The BMW S14B23 is a 2.3 liter (2,302 cc) petrol engine from the S14 family. It has an inline 4, DOHC, 16 valve layout with no turbo (naturally aspirated), and makes 147 kW (200 HP) with 240 Nm of torque. BMW built it from 1986 to 1991 and it meets the Euro 1 emission standard.

You find the S14B23 in the BMW E30 M3, BMW E30 M3 Evolution and BMW E30 M3 Sport Evolution. What we list: BMW S14 four-cylinder engines from the E30 M3.

At Autowerke Engines every S14B23 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 S14 Engines · Search S14B23 in the shop

How much does a used BMW S14B23 engine cost?

A used BMW S14B23 engine in our yard usually costs between 5.850 € and 8.950 €. 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 S14 Engines · Search S14B23 in the shop

Which cars use the BMW S14B23 engine?

BMW fitted the S14B23 to the BMW E30 M3, BMW E30 M3 Evolution and BMW E30 M3 Sport Evolution. These cars were built with this engine from about 1986 to 1991.

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 S14B23 is the only S14 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 S14 Engines · Search S14B23 in the shop

How much power and torque does the BMW S14B23 have?

From the factory the BMW S14B23 makes 147 kW (200 HP) and 240 Nm of torque. It is a 2.3 liter (2,302 cc) inline 4, DOHC, 16 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 S14B23 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 S14 Engines · Search S14B23 in the shop

How do I know a used S14B23 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. 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 S14B23, 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 S14 Engines · Search S14B23 in the shop

What comes with a used S14B23 engine?

Each S14B23 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 S14 Engines · Search S14B23 in the shop

Is the BMW S14B23 a diesel or petrol engine?

The S14B23 is a petrol engine. It is a 2.3 liter (2,302 cc) inline 4, DOHC, 16 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 S14 Engines · Search S14B23 in the shop

Are there other versions of the BMW S14B23?

In our yard the S14B23 is the only listed version of the S14 family. It makes 147 kW (200 HP) and 240 Nm, and was built from 1986 to 1991.

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 S14 Engines · Search S14B23 in the shop

How long does delivery of an S14B23 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 S14 Engines · Search S14B23 in the shop

What should I replace when I fit a used S14B23 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 S14 Engines · Search S14B23 in the shop

Does a used S14B23 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 S14 Engines · Search S14B23 in the shop

Can you check if an S14B23 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 S14B23, we confirm that your car was built with this code or with a version that can take it. BMW used it in the BMW E30 M3, BMW E30 M3 Evolution and BMW E30 M3 Sport Evolution.

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 S14 Engines · Search S14B23 in the shop

What should I know about the BMW S14 engine?

BMW S14 four-cylinder engines from the E30 M3. We list one version: S14B23 (2.3 liter (2,302 cc), 147 kW (200 HP), 1986 to 1991).

Because there is only one version, the code is easy to match. You still need the engine computer and wiring that suit your car.

The S14 family was used in chassis E30. 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.

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 S14 Engines

What should I check on a used BMW S14 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 S14 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.

If you want more photos or a short video of a unit, ask the desk and we send them before you pay. 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 S14 Engines · Inspection certificate

Which years were BMW S14 engines made?

BMW built the S14 engines we list from about 1986 to 1991. The S14B23 ran from 1986 to 1991.

They went into chassis E30. 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.

See all S14 Engines

More answers from the Hamburg desk

These are further questions buyers ask us when choosing a replacement engine, answered by the people who check, pack and ship the engines.

How long does engine delivery to Czechia take?

Delivery from our Hamburg yard to Czechia takes 2 to 5 working days after dispatch. Orders confirmed before 14:00 CET on a working day leave Hamburg the same day. Later and weekend orders leave the next working day.

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.

Czechia is in the EU customs area for this shipment, so there is no import duty and no customs paperwork.

The carrier delivers to the kerb or a loading bay. Please have a forklift, a pallet truck or an engine crane ready, and check the wrapping before you sign.

How long does engine delivery to Lithuania take?

Delivery from our Hamburg yard to Lithuania takes 2 to 5 working days after dispatch. Orders confirmed before 14:00 CET on a working day leave Hamburg the same day. Later and weekend orders leave the next working day.

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.

Lithuania is in the EU customs area for this shipment, so there is no import duty and no customs paperwork.

The carrier delivers to the kerb or a loading bay. Please have a forklift, a pallet truck or an engine crane ready, and check the wrapping before you sign.

Is it safe to pay by card?

Yes. Card payments are handled by trusted payment providers with industry-standard encryption.

You never type your card number on our site. We email you a secure payment link after you place the order, and 3-D Secure applies.

Payment is taken when the order is confirmed.

We do not store any card details.

How do I pay with USDT or Bitcoin?

After you place the order, we email a wallet address and the amount in euro.

For USDT, the email also names the network. Send only on that network, or the payment may be lost.

The unit stays reserved until the transfer is confirmed on the network, then it is dispatched.

If anything is unclear, ask the desk before you send.

How do I make a warranty claim?

Contact the desk with your order number, a short description of the problem, and photos or a video.

We may ask for a mechanic's inspection report.

If the claim is approved, we repair, replace or refund the engine.

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.

How long does engine delivery to Luxembourg take?

Delivery from our Hamburg yard to Luxembourg takes 1 to 3 working days after dispatch. Orders confirmed before 14:00 CET on a working day leave Hamburg the same day. Later and weekend orders leave the next working day.

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.

Luxembourg is in the EU customs area for this shipment, so there is no import duty and no customs paperwork.

The carrier delivers to the kerb or a loading bay. Please have a forklift, a pallet truck or an engine crane ready, and check the wrapping before you sign.

How long does engine delivery to Estonia take?

Delivery from our Hamburg yard to Estonia takes 2 to 5 working days after dispatch. Orders confirmed before 14:00 CET on a working day leave Hamburg the same day. Later and weekend orders leave the next working day.

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.

Estonia is in the EU customs area for this shipment, so there is no import duty and no customs paperwork.

The carrier delivers to the kerb or a loading bay. Please have a forklift, a pallet truck or an engine crane ready, and check the wrapping before you sign.

Do I pay customs or import duty?

Inside the EU, there is no import duty and no customs paperwork.

For the UK, Switzerland, Norway and other non-EU countries, the receiver pays import duty and local VAT.

We supply a commercial invoice and origin documents where they apply, which makes customs clearance faster.

Ask the desk for a delivery quote for your country before you order.

How long does engine delivery to Spain take?

Delivery from our Hamburg yard to Spain takes 2 to 5 working days after dispatch. Orders confirmed before 14:00 CET on a working day leave Hamburg the same day. Later and weekend orders leave the next working day.

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.

Spain is in the EU customs area for this shipment, so there is no import duty and no customs paperwork.

The carrier delivers to the kerb or a loading bay. Please have a forklift, a pallet truck or an engine crane ready, and check the wrapping before you sign.

What does the free VIN check do?

The VIN check on our site reads the year, the make, the model and the engine from the public vehicle register.

After that, our desk confirms the gearbox and the parts your car needs, so the engine you reserve is the right one.

The check is free and there is no obligation to buy.

Your VIN is 17 characters long. You find it on the registration papers, at the bottom of the windscreen or on the door pillar.

Which payment methods do you accept?

You can pay by Visa, Mastercard or American Express through a secure link we email after you order. You can also pay by SEPA bank transfer, USDT or Bitcoin.

iDEAL, Bancontact and other local methods are offered based on your delivery country.

Approved workshops and fleet operators can order on 30-day terms.

Every payment runs over an encrypted connection, and we never see or store your card details.

How long does engine delivery to Denmark take?

Delivery from our Hamburg yard to Denmark takes 1 to 3 working days after dispatch. Orders confirmed before 14:00 CET on a working day leave Hamburg the same day. Later and weekend orders leave the next working day.

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.

Denmark is in the EU customs area for this shipment, so there is no import duty and no customs paperwork.

The carrier delivers to the kerb or a loading bay. Please have a forklift, a pallet truck or an engine crane ready, and check the wrapping before you sign.

How do I find the engine code of my car?

The engine code is stamped on the engine block. On most BMW engines it sits on the side of the block, near the base of the cylinder head or by the oil filter housing.

It is also on many registration papers, and a dealer or a parts shop can read it from your VIN.

The easiest way is to send us your VIN. We read the engine code for you and tell you which engine fits.

Never order by the badge on the boot alone. The same model name can hide two different engines.

What should I do before the first start?

Fit a new oil filter, fill with the correct oil and refill the coolant. On turbo engines, fill the turbo oil feed with clean oil.

Turn the engine over without fuel or ignition until the oil pressure light goes out. This brings oil to every bearing before the engine runs.

Check all hoses, clips and electrical plugs, then start the engine and let it idle while you look for leaks.

Bleed the cooling system and top up as the air comes out.

How long does engine delivery to Belgium take?

Delivery from our Hamburg yard to Belgium takes 1 to 3 working days after dispatch. Orders confirmed before 14:00 CET on a working day leave Hamburg the same day. Later and weekend orders leave the next working day.

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.

Belgium is in the EU customs area for this shipment, so there is no import duty and no customs paperwork.

The carrier delivers to the kerb or a loading bay. Please have a forklift, a pallet truck or an engine crane ready, and check the wrapping before you sign.

How long is the engine warranty?

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 engine must be fitted by a qualified mechanic or workshop, with the correct oil, coolant, filters and service parts.

Report any problem to us right away, and do not open or repair the engine without our written approval.

If a claim is approved, we repair, replace or refund the engine.

How long does engine delivery to Finland take?

Delivery from our Hamburg yard to Finland takes 2 to 5 working days after dispatch. Orders confirmed before 14:00 CET on a working day leave Hamburg the same day. Later and weekend orders leave the next working day.

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.

Finland is in the EU customs area for this shipment, so there is no import duty and no customs paperwork.

The carrier delivers to the kerb or a loading bay. Please have a forklift, a pallet truck or an engine crane ready, and check the wrapping before you sign.

Can I reuse parts from my old engine?

Often yes. Turbos, injectors, the alternator and other ancillaries can move over if they are in good condition.

Parts that failed with the old engine, or that look worn, should be replaced. A worn turbo can damage a good engine.

Always use new gaskets and seals where parts are moved over.

Our listings show what is fitted to each unit, so you can plan what to reuse.

How long does engine delivery to Portugal take?

Delivery from our Hamburg yard to Portugal takes 2 to 5 working days after dispatch. Orders confirmed before 14:00 CET on a working day leave Hamburg the same day. Later and weekend orders leave the next working day.

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.

Portugal is in the EU customs area for this shipment, so there is no import duty and no customs paperwork.

The carrier delivers to the kerb or a loading bay. Please have a forklift, a pallet truck or an engine crane ready, and check the wrapping before you sign.

How fast does my order leave the yard?

Orders confirmed before 14:00 CET on a working day leave Hamburg the same day. Later and weekend orders leave the next working day.

You get a tracking number as soon as the carrier collects the pallet.

Delivery inside Western Europe usually takes 1 to 5 working days.

If you need the engine by a certain date, tell us when you order. We plan the dispatch around it.

How is an engine packed for shipping?

Every engine is drained, sealed at each opening, strapped to a heat-treated pallet and shrink-wrapped, then photographed before it leaves the yard.

Open faces are protected with board and foam, so nothing gets knocked in transit.

Fluids are drained to keep the pallet clean and safe for the carrier.

The photos of the packed pallet are kept on file, which helps if there is ever a damage claim.

Can I return an engine?

Yes, within 14 days of delivery, if the item has not been fitted or used and comes back in its original condition and packing with all supplied parts.

Please contact us before you send anything back. Returns without our approval cannot be accepted.

Once the return arrives and is checked, we tell you the result. Approved refunds go back to your original payment method.

The original shipping fee is not refunded unless the return is our mistake.

How long does engine delivery to Sweden take?

Delivery from our Hamburg yard to Sweden takes 2 to 5 working days after dispatch. Orders confirmed before 14:00 CET on a working day leave Hamburg the same day. Later and weekend orders leave the next working day.

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.

Sweden is in the EU customs area for this shipment, so there is no import duty and no customs paperwork.

The carrier delivers to the kerb or a loading bay. Please have a forklift, a pallet truck or an engine crane ready, and check the wrapping before you sign.

What if my engine arrives damaged?

Check the pallet before you sign. If the wrapping is damaged, note it on the paperwork and take photos.

Contact us within 48 hours of delivery with your order number and clear photos of the product and the packing.

If you got the wrong item or it arrived damaged, we pay the return shipping and put it right.

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.

How long does engine delivery to Austria take?

Delivery from our Hamburg yard to Austria takes 2 to 5 working days after dispatch. Orders confirmed before 14:00 CET on a working day leave Hamburg the same day. Later and weekend orders leave the next working day.

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.

Austria is in the EU customs area for this shipment, so there is no import duty and no customs paperwork.

The carrier delivers to the kerb or a loading bay. Please have a forklift, a pallet truck or an engine crane ready, and check the wrapping before you sign.

How should I drive in the first 1,000 km?

Drive gently and vary the speed. Avoid full throttle and very high revs for the first few hundred kilometres.

Watch the temperature and the oil pressure, and check the oil and coolant level often.

Many fitters change the oil and the filter again after the first 1,000 km. It is cheap and removes any dirt from the fitting.

Report any warning light or strange noise to us right away.

How long does engine delivery to Germany take?

Delivery from our Hamburg yard to Germany takes 1 to 3 working days after dispatch. Orders confirmed before 14:00 CET on a working day leave Hamburg the same day. Later and weekend orders leave the next working day.

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.

Germany is in the EU customs area for this shipment, so there is no import duty and no customs paperwork.

The carrier delivers to the kerb or a loading bay. Please have a forklift, a pallet truck or an engine crane ready, and check the wrapping before you sign.

How long does engine delivery to Malta take?

Delivery from our Hamburg yard to Malta takes 4 to 8 working days after dispatch. Orders confirmed before 14:00 CET on a working day leave Hamburg the same day. Later and weekend orders leave the next working day.

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.

Malta is in the EU customs area for this shipment, so there is no import duty and no customs paperwork.

The carrier delivers to the kerb or a loading bay. Please have a forklift, a pallet truck or an engine crane ready, and check the wrapping before you sign.

Glossary

• 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.
• Rod bearings — The bearings between the connecting rods and the crankshaft. On several M engines they wear and are replaced preventively.
• ITB — Individual throttle bodies, one per cylinder, used on most naturally aspirated M engines for sharp response.
• 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

Bought with care, the S14 is a sound choice. 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 S14 will give years of service.

Ready to order, or need help choosing? Browse every S14 in stock, contact the Hamburg desk or send us your VIN on WhatsApp.

Guides to each S14 version

• BMW S14B23 engine: specs, problems and prices
• BMW S14B20 engine: specs, problems and prices