BMW F25 X3 and F26 X4 engines: every engine, fitment and price

The second X3 (F25, 2010 to 2017) and first X4 (F26, 2014 to 2018) used the N20, N52 and N55 petrols and the N47, B47 and N57 diesels.

In total, 4 model and engine combinations are listed for the BMW F25 X3 and F26 X4 in our data, using 4 engine families: N47, N57, N55 and N20 and N26. Production covered 2010–2017. We currently hold 199 engines that suit these cars.

Every BMW F25 X3 and F26 X4 engine at a glance

BMW F25 X3 and F26 X4: petrol engines

N55 in the BMW F25 X3 and F26 X4

For the F25 X3 35i, BMW fitted the N55B30 — 3.0 L, turbocharged, 306 hp. See every N55B30 in stock.

BMW introduced the N55 with a single twin-scroll turbo, Valvetronic and solenoid direct injectors.

On the N55, our workshop watches for oil filter housing gasket, valve cover gasket and electric water pump and thermostat. Replace the oil filter housing gasket and valve cover gasket before installing a used N55.

Read our full N55 guide

We have 2 N55 engines that suit the BMW F25 X3 and F26 X4, from 5.372,00 €.

N20 and N26 in the BMW F25 X3 and F26 X4

For the F25 X3 28i, BMW fitted the N20B20 — 2.0 L, turbocharged, 245 hp. See every N20B20 in stock.

Launched in 2011 to replace the N52 and N46 in many cars, the N20 combined a twin-scroll turbocharger, direct injection, Valvetronic and double VANOS.

On the N20 and N26, our workshop watches for timing chain guide, oil pump drive chain and electric water pump. Replacing the chain on an N20 normally needs the engine out, so a used unit is the time to do it.

Read our full N20 and N26 guide

We have 77 N20 and N26 engines that suit the BMW F25 X3 and F26 X4, from 1.330,00 €.

BMW F25 X3 and F26 X4: diesel engines

N47 in the BMW F25 X3 and F26 X4

For the F25 X3 20d, BMW fitted the N47D20 — 2.0 L, turbocharged, 184 hp. See every N47D20 in stock.

BMW launched the N47 in 2007 with an aluminium block, common-rail injection and a rear-mounted timing chain.

On the N47, our workshop watches for timing chain, swirl flaps and egr cooler. Replace the timing chain and guides when fitting a used N47 unless they were recently done.

Read our full N47 guide

We have 13 N47 engines that suit the BMW F25 X3 and F26 X4, from 971,00 €.

N57 in the BMW F25 X3 and F26 X4

F25 X3 30d: N57D30, 3.0 L, 258 hp and 560 Nm (2008–2017). See every N57D30 in stock.

BMW launched the N57 in 2008 with common-rail injection and a rear timing chain.

On the N57, our workshop watches for swirl flaps, egr cooler and diesel particulate filter. Check the EGR recall and the swirl flaps when buying.

Read our full N57 guide

We have 54 N57 engines that suit the BMW F25 X3 and F26 X4, from 1.210,00 €.

Will it fit? BMW F25 X3 and F26 X4 engine questions

Will the N47D20 fit my BMW F25 X3 20d?

The N47D20 is the original engine for the BMW F25 X3 20d, which makes it the straightforward choice. The second X3 was built 2010–2017, and the N47D20 was produced 2007–2016, 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 F25 X3 20d?

We have 13 N47D20 engines from F25 donor cars, priced from 971,00 € to 4.406,00 €. 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 N57D30 fit my BMW F25 X3 30d?

Yes, the BMW F25 X3 30d left the factory with the N57D30, so an N57D30 from another car is the direct replacement. The second X3 was built 2010–2017, and the N57D30 was produced 2008–2017, 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 F25 X3 30d?

We have 53 N57D30 engines from F25 donor cars, priced from 1.210,00 € to 3.957,00 €. 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 N55B30 fit my BMW F25 X3 35i?

For the BMW F25 X3 35i, the N55B30 is the factory engine and the one to order. The second X3 was built 2010–2017, and the N55B30 was produced 2009–2017, 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 F25 X3 35i?

We have 2 N55B30 engines from F25 donor cars, priced from 5.372,00 € to 5.522,00 €. 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 N20B20 fit my BMW F25 X3 28i?

The N20B20 is the original engine for the BMW F25 X3 28i, which makes it the straightforward choice. The second X3 was built 2010–2017, and the N20B20 was produced 2011–2017, 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 F25 X3 28i?

We have 77 N20B20 engines from F25 donor cars, priced from 1.330,00 € to 3.178,00 €. 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.

Engine swap questions for the BMW F25 X3 and F26 X4

Owners often ask whether a more powerful engine from another BMW F25 X3 and F26 X4 model can be fitted. These answers show what each upgrade involves.

Can I fit the N20B20 from the F25 X3 28i into an F25 X3 20d?

It is a full conversion: the N20B20 runs on petrol and the N47D20 on diesel, so the fuel system, wiring, ECU, instrument coding and usually the gearbox change too. The gain is 61 hp and 0 Nm. In Germany and most of Europe a swap must be inspected and registered; check with your testing station first.

Can I fit the N57D30 from the F25 X3 30d into an F25 X3 20d?

It is a conversion rather than a replacement. The N57D30 is an inline-6 and the N47D20 an inline-4, so mounts, sump, cooling, exhaust, wiring and ECU all change. The gain is 74 hp and 180 Nm. In Germany and most of Europe a swap must be inspected and registered; check with your testing station first.

Can I fit the N55B30 from the F25 X3 35i into an F25 X3 30d?

It is a full conversion: the N55B30 runs on petrol and the N57D30 on diesel, so the fuel system, wiring, ECU, instrument coding and usually the gearbox change too. The gain is 48 hp and 0 Nm. In Germany and most of Europe a swap must be inspected and registered; check with your testing station first.

Can I fit the N57D30 from the F25 X3 30d into an F25 X3 28i?

It is a full conversion: the N57D30 runs on diesel and the N20B20 on petrol, so the fuel system, wiring, ECU, instrument coding and usually the gearbox change too. The gain is 13 hp and 210 Nm. In Germany and most of Europe a swap must be inspected and registered; check with your testing station first.

Can I fit the N55B30 from the F25 X3 35i into an F25 X3 28i?

It is a conversion rather than a replacement. The N55B30 is an inline-6 and the N20B20 an inline-4, so mounts, sump, cooling, exhaust, wiring and ECU all change. The gain is 61 hp and 50 Nm. In Germany and most of Europe a swap must be inspected and registered; check with your testing station first.

Fitment and swap notes for the BMW F25 X3 and F26 X4

• The 20d moved from the N47 to the B47.

Engines from the same family usually share mounts and gearbox bolt patterns, but wiring, ECU, sump and cooling differ between versions. Moving to a different family is a conversion, not a replacement.

N47: Remaps add around 30 hp; check the chain first.

N57: Remaps add around 50 hp. The N57 is popular for conversions.

N55: Remaps add a lot; upgraded turbos and fuel pumps take it further.

N20 and N26: Remaps unlock significant gains. A healthy N20 with updated guides is a good tuning base.

Known problems by engine in the BMW F25 X3 and F26 X4

N47

• Timing chain. Listen for a rattle at the gearbox end on a cold start and ask whether the chain has been replaced.
• Swirl flaps. Check the intake for damage.
• EGR cooler. Check the recall status and for coolant loss.
• Diesel particulate filter. Read the soot load and DPF fault codes.
• Injectors. Read injector correction values.

N57

• Swirl flaps. Check the intake.
• EGR cooler. Check the recall status.
• Diesel particulate filter. Read the soot load.
• Timing chain. Listen for a rattle on a cold start.
• Injectors. Read injector correction values.

N55

• Oil filter housing gasket. Look below the filter housing.
• Valve cover gasket. Look for oil on the exhaust side.
• Electric water pump and thermostat. Check cooling codes.
• Charge pipe. Listen for boost leaks.
• Wastegate rattle. Listen when lifting off.
• Oil pan gasket. Check underneath.

N20 and N26

• Timing chain guide. Listen for a whine or rattle; ask if the updated guides and chain are fitted.
• Oil pump drive chain. Check oil pressure warnings.
• Electric water pump. Check for cooling fault codes.
• Oil filter housing and valve cover gaskets. Look at the exhaust side for oil.
• Carbon build-up. Borescope inspection.

How to identify the right engine for your BMW F25 X3 and F26 X4

Start with the VIN. The last seven characters identify your car in BMW's systems, and from them we can confirm the engine code, the production date, the gearbox and whether the car has xDrive. That is the only reliable way to order.

Next, check the stamp on the block. On most BMW four- and six-cylinder engines it sits on the left side of the block below the intake; on V engines it is usually at the back near the gearbox. The stamp shows the engine code and serial number.

Finally, compare the ancillaries. Two engines with the same code can carry different turbos, injectors, manifolds or sensors depending on the model and market. Our listings show what is fitted to each unit.

BMW F25 X3 and F26 X4 engine prices

Our BMW F25 X3 and F26 X4 engine stock runs to 199 units, priced from 916,00 € to 5.522,00 € with a median of 2.830,00 €.

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.

BMW F25 X3 and F26 X4 engine prices by model year

Engines from 2010–2014 have a median of 2.830,00 €, while units from 2015–2019 sit at 2.859,00 €. Newer engines usually cost more because they come from younger donor cars with lower mileage and later updates.

BMW F25 X3 and F26 X4 engine prices by mileage

Mileage matters less than history on a well-maintained BMW engine, but it is a useful guide. A low-mileage unit from a younger car gives you more life for a modest premium.

BMW F25 X3 and F26 X4 engines in stock now

Here is a selection of BMW F25 X3 and F26 X4 engine engines currently on our shelves, photographed in the yard. Click any of them for the full photographs, mileage and specification.

BMW F25 X3 xDrive28i N20B20 Engine 2015, 196,700 km2.142,00 €BMW F25 X3 xDrive30d N57D30A Engine 2010, 144,100 km3.768,00 €BMW F25 X3 xDrive30d N57D30A Engine 2011, 200,600 km2.887,00 €BMW F25 X3 xDrive28i N20B20 Engine 2011, 140,200 km2.964,00 €BMW F25 X3 xDrive20d B47D20 Engine 2019, 77,100 km3.224,00 €BMW F25 X3 xDrive28i N20B20 Engine 2013, 183,300 km2.871,00 €BMW F25 X3 xDrive30d N57D30A Engine 2010, 28,300 km3.106,00 €BMW F25 X3 xDrive20d B47D20 Engine 2015, 171,900 km2.930,00 €BMW F25 X3 xDrive28i N20B20 Engine 2011, 75,300 km2.882,00 €BMW F25 X3 xDrive28i N20B20 Engine 2014, 168,600 km2.229,00 €BMW F25 X3 xDrive20d B47D20 Engine 2016, 95,000 km2.429,00 €BMW F25 X3 xDrive20d B47D20 Engine 2015, 62,500 km3.167,00 €

BMW F25 X3 xDrive28i N20B20 Engine 2015, 196,700 km — 2.142,00 €, reduced from 3.600,00 €. It comes from a 2015 donor car with 196,700 km, and 17 units are available. Ask the desk for compression figures or extra photographs before you order.

BMW F25 X3 xDrive30d N57D30A Engine 2010, 144,100 km — 3.768,00 €, reduced from 5.050,00 €. It comes from a 2010 donor car with 144,100 km, and 26 units are available. We can confirm fitment against your VIN the same day.

BMW F25 X3 xDrive30d N57D30A Engine 2011, 200,600 km — 2.887,00 €, reduced from 3.700,00 €. It comes from a 2011 donor car with 200,600 km, and 29 units are available. The listing shows every side of the engine and the fitted parts.

BMW F25 X3 xDrive28i N20B20 Engine 2011, 140,200 km — 2.964,00 €, reduced from 4.100,00 €. It comes from a 2011 donor car with 140,200 km, and 26 units are available. We can confirm fitment against your VIN the same day.

BMW F25 X3 xDrive20d B47D20 Engine 2019, 77,100 km — 3.224,00 €, reduced from 4.150,00 €. It comes from a 2019 donor car with 77,100 km, and 21 units are available. The listing shows every side of the engine and the fitted parts.

BMW F25 X3 xDrive28i N20B20 Engine 2013, 183,300 km — 2.871,00 €, reduced from 3.750,00 €. It comes from a 2013 donor car with 183,300 km, and 12 units are available. We can confirm fitment against your VIN the same day.

BMW F25 X3 xDrive30d N57D30A Engine 2010, 28,300 km — 3.106,00 €, reduced from 4.150,00 €. It comes from a 2010 donor car with 28,300 km, and 25 units are available. We can confirm fitment against your VIN the same day.

BMW F25 X3 xDrive20d B47D20 Engine 2015, 171,900 km — 2.930,00 €, reduced from 3.600,00 €. It comes from a 2015 donor car with 171,900 km, and 5 units are available. The listing shows every side of the engine and the fitted parts.

BMW F25 X3 xDrive28i N20B20 Engine 2011, 75,300 km — 2.882,00 €, reduced from 3.950,00 €. It comes from a 2011 donor car with 75,300 km, and 28 units are available. The listing shows every side of the engine and the fitted parts.

BMW F25 X3 xDrive28i N20B20 Engine 2014, 168,600 km — 2.229,00 €, reduced from 3.400,00 €. It comes from a 2014 donor car with 168,600 km, and 20 units are available. Ask the desk for compression figures or extra photographs before you order.

BMW F25 X3 xDrive20d B47D20 Engine 2016, 95,000 km — 2.429,00 €, reduced from 3.500,00 €. It comes from a 2016 donor car with 95,000 km, and 12 units are available. The listing shows every side of the engine and the fitted parts.

BMW F25 X3 xDrive20d B47D20 Engine 2015, 62,500 km — 3.167,00 €, reduced from 4.050,00 €. It comes from a 2015 donor car with 62,500 km, and 14 units are available. We can confirm fitment against your VIN the same day.

Buying checklist for a BMW F25 X3 and F26 X4 engine

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. Turbocharger shaft play and oil. Rotate the compressor wheel by hand. A small amount of side play is normal; in-and-out play or wheel contact with the housing is not. Oil pooled in the intake or intercooler pipes points to worn seals.
12. Injector correction values. On a diesel that can be run before removal, the injector correction values show whether one injector is delivering more or less fuel than the others. Large deviations mean an injector is on its way out.
13. Particulate filter and EGR history. Short-trip diesels clog their DPF and EGR systems. The engine may be fine, but ask whether the donor car had DPF warnings, and plan to clean or check your own filter before fitting.
14. Swirl flaps. Check whether the swirl flaps are in place, blanked or removed. Broken swirl flaps are a known cause of engine failure on several BMW diesels, so many owners fit blanking plates when the intake is off.
15. 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.
16. Gearbox-end timing chain. On this engine the timing chain sits at the gearbox end, so replacing it normally means removing the engine. If the chain has not been replaced, the time to do it is before the engine goes into your car.
17. 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.
18. Double VANOS units and solenoids. Ask for the adaptation values or fault history if the engine was running. Solenoids are inexpensive and are often replaced as a matter of course on a used engine.
19. Valvetronic motor and eccentric shaft sensor. The Valvetronic motor and its sensor cause limp-mode faults when they fail. Inspect the connector and the seal around the motor for oil.
20. Injectors and high-pressure fuel pump. Direct-injection engines rely on high-pressure pumps and precise injectors. Ask whether the injectors are original or updated and whether there were fuel pressure faults.
21. Electric water pump. This engine uses an electric water pump. It fails without warning and needs a diagnostic bleeding routine when it is replaced or the system is refilled.

Fitting an engine to your BMW F25 X3 and F26 X4

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. Replace the rear timing chain if in doubt. On engines with the chain at the gearbox end, chain work needs the engine out. If the history is unknown, replace the chain, guides and tensioner before fitting.
8. Prepare the turbo. Fit new oil feed and return seals, clean the intercooler and pipes of any oil or debris from the old engine, and prime the turbo with oil before starting.
9. Code the injectors and bleed the fuel. Enter the injector correction codes into the ECU, check the glow plugs and bleed the fuel system so the engine does not crank dry.
10. Check the particulate filter. If the old engine failed with oil or coolant entering the exhaust, the DPF may be contaminated. Check its back-pressure before relying on it.
11. 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.
12. 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.
13. 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.
14. Reset VANOS adaptations. Clear the VANOS adaptations so the ECU learns the camshaft positions of the new engine.
15. Teach the Valvetronic limit stops. Run the Valvetronic learning routine so the ECU knows the eccentric shaft limits.
16. 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.
17. 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.

Diagnosing engine trouble in a BMW F25 X3 and F26 X4

If your current engine is showing one of these symptoms, this table helps you judge whether it can be repaired or whether a replacement engine 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.

Rattle or whine from the gearbox end. On engines with the timing chain at the rear, a rattle or whine from the back of the engine is the warning sign of chain stretch or guide wear.

Whistle, loss of boost or limp mode. A split charge pipe, a sticking wastegate or worn turbo bearings. Check the pipes first, then the turbo shaft for play.

Black smoke under acceleration. Too much fuel for the air available: boost leaks, a sticking EGR valve, a dirty air mass meter or a leaking injector.

Hard starting when cold. Glow plugs or the glow plug control unit. On older diesels, also check the injection pump and fuel lines for air leaks.

Particulate filter warning. Short trips stop the DPF from regenerating. A long motorway run often clears it; a filter that keeps blocking may be covering an injector, EGR or turbo problem.

Sudden metallic noise followed by misfire. On diesels with swirl flaps, a broken flap or screw can enter a cylinder. Stop the engine immediately; continued running usually destroys the piston and head.

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.

Limp mode with a Valvetronic fault. The Valvetronic motor, its eccentric shaft sensor or the wiring. The engine runs on a reduced throttle until it is repaired.

Long cranking before the engine starts. On direct-injection engines, a weak high-pressure fuel pump or leaking injector lets pressure drop when the engine is off.

Repair or replace the engine in your BMW F25 X3 and F26 X4?

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

Timing chain work on the engine needs the engine removed. When the chain has failed and damaged valves or pistons, a replacement engine with a sound chain is often the same price as the repair.

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.

Delivery, warranty and payment

Every BMW F25 X3 and F26 X4 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.

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 BMW F25 X3 and F26 X4 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 about BMW F25 X3 and F26 X4 engines

Will the N57D30A engine fit my BMW F25 X3 xDrive30d?

Yes, if your BMW F25 X3 xDrive30d was built with the N57D30A. BMW used this 3.0 liter (2,993 cc) diesel engine with 190 kW (258 HP) in the F25 X3 xDrive30d from about 2010 to 2017.

In our records the N57D30A is the engine for the F25 X3 xDrive30d, which makes the match simple. Still, check the code on your old engine or send us your VIN.

Your car has all-wheel drive or is an X model, so the sump, the oil pickup and some brackets can differ from the rear-drive cars. Tell us the full model so we send the right set-up.

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 N57 Engines · Search N57D30A in the shop

How much is a replacement N57D30A engine for a BMW F25 X3 xDrive30d?

A used N57D30A for the BMW F25 X3 xDrive30d costs from about 2.650 € to 4.200 € 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 N57D30A 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 N57 Engines · Search N57D30A in the shop

Will the N55B30 engine fit my BMW F25 X3 xDrive35i?

Yes, if your BMW F25 X3 xDrive35i was built with the N55B30. BMW used this 3.0 liter (2,979 cc) petrol engine with 225 kW (306 HP) in the F25 X3 xDrive35i from about 2010 to 2017.

In our records the N55B30 is the engine for the F25 X3 xDrive35i, which makes the match simple. Still, check the code on your old engine or send us your VIN.

Your car has all-wheel drive or is an X model, so the sump, the oil pickup and some brackets can differ from the rear-drive cars. Tell us the full model so we send the right set-up.

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 N55 Engines · Search N55B30 in the shop

How much is a replacement N55B30 engine for a BMW F25 X3 xDrive35i?

A used N55B30 for the BMW F25 X3 xDrive35i costs from about 3.100 € to 4.850 € 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 N55B30 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 N55 Engines · Search N55B30 in the shop

Will the N20B20 engine fit my BMW F25 X3 xDrive28i?

Yes, if your BMW F25 X3 xDrive28i was built with the N20B20. BMW used this 2.0 liter (1,997 cc) petrol engine with 180 kW (245 HP) in the F25 X3 xDrive28i from about 2011 to 2017.

In our records the N20B20 is the engine for the F25 X3 xDrive28i, which makes the match simple. Still, check the code on your old engine or send us your VIN.

Your car has all-wheel drive or is an X model, so the sump, the oil pickup and some brackets can differ from the rear-drive cars. Tell us the full model so we send the right set-up.

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 N20 Engines · Search N20B20 in the shop

How much is a replacement N20B20 engine for a BMW F25 X3 xDrive28i?

A used N20B20 for the BMW F25 X3 xDrive28i costs from about 2.000 € to 3.200 € 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 N20B20 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 N20 Engines · Search N20B20 in the shop

Questions about the engines in the BMW F25 X3 and F26 X4

Will the N57D30A engine fit my BMW F10 530d?

Yes, if your BMW F10 530d was built with the N57D30A. BMW used this 3.0 liter (2,993 cc) diesel engine with 190 kW (258 HP) in the F10 530d from about 2010 to 2017.

In our records the N57D30A is the engine for the F10 530d, which makes the match simple. Still, check the code on your old engine or send us your VIN.

Also tell us if your F10 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 N57 Engines · Search N57D30A in the shop

Is the BMW N55B30 a diesel or petrol engine?

The N55B30 is a petrol engine. It is a 3.0 liter (2,979 cc) inline 6, DOHC, 24 valve unit with a twin-scroll turbocharger, and it was built to the Euro 5 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 N55 Engines · Search N55B30 in the shop

Will the N57D30B engine fit my BMW F10 535d?

Yes, if your BMW F10 535d was built with the N57D30B. BMW used this 3.0 liter (2,993 cc) diesel engine with 230 kW (313 HP) in the F10 535d from about 2011 to 2018.

In our records the N57D30B is the engine for the F10 535d, which makes the match simple. Still, check the code on your old engine or send us your VIN.

Also tell us if your F10 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 N57 Engines · Search N57D30B in the shop

How much is a replacement N57D30A engine for a BMW F30 330d?

A used N57D30A for the BMW F30 330d costs from about 2.650 € to 4.200 € 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 N57D30A 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 N57 Engines · Search N57D30A in the shop

How much is a replacement N55B30 engine for a BMW F20 M135i?

A used N55B30 for the BMW F20 M135i costs from about 3.100 € to 4.850 € 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 N55B30 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 N55 Engines · Search N55B30 in the shop

Which cars use the BMW N57D30S engine?

BMW fitted the N57D30S to the BMW F10 M550d, BMW F15 X5 M50d, BMW F16 X6 M50d and BMW F01 750d. These cars were built with this engine from about 2012 to 2018.

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 N57 family are the N57D30A (258 HP) and N57D30B (313 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 N57 Engines · Search N57D30S in the shop

Will the N55B30 engine fit my BMW E92 335i?

Yes, if your BMW E92 335i was built with the N55B30. BMW used this 3.0 liter (2,979 cc) petrol engine with 225 kW (306 HP) in the E92 335i from about 2010 to 2017.

Some E92 335i cars were built with a different engine: the N54B30. These look alike from the outside, so check the code on your engine or send us your VIN.

Also tell us if your E92 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 N55 Engines · Search N55B30 in the shop

Can I put an N57D30 engine in my Defender 110?

Yes. We sell conversion kits that fit the N57D30 into the Defender 110. The kit replaces the Td5, 300Tdi and 2.2 TDCi, and works with the ZF 8HP70 and R380.

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 Defender 110'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 N57 Defender Conversion Kits · Conversion guide

Will the N20B20 engine fit my BMW F32 428i?

Yes, if your BMW F32 428i was built with the N20B20. BMW used this 2.0 liter (1,997 cc) petrol engine with 180 kW (245 HP) in the F32 428i from about 2011 to 2017.

In our records the N20B20 is the engine for the F32 428i, which makes the match simple. Still, check the code on your old engine or send us your VIN.

Also tell us if your F32 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 N20 Engines · Search N20B20 in the shop

How much is a replacement N47D20C engine for a BMW F31 320d?

A used N47D20C for the BMW F31 320d costs from about 1.400 € to 2.350 € 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 N47D20C 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 N47 Engines · Search N47D20C in the shop

How much is a replacement N57D30B engine for a BMW F16 X6 xDrive35d?

A used N57D30B for the BMW F16 X6 xDrive35d costs from about 3.350 € to 5.200 € 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 N57D30B 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 N57 Engines · Search N57D30B in the shop

What should I check on a used BMW N20 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 N20 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 N20 Engines · Inspection certificate

Are there other versions of the BMW N20B20?

In our yard the N20B20 is the only listed version of the N20 family. It makes 180 kW (245 HP) and 350 Nm, and was built from 2011 to 2017.

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 N20 Engines · Search N20B20 in the shop

Will the N57D30B engine fit my BMW F15 X5 xDrive35d?

Yes, if your BMW F15 X5 xDrive35d was built with the N57D30B. BMW used this 3.0 liter (2,993 cc) diesel engine with 230 kW (313 HP) in the F15 X5 xDrive35d from about 2011 to 2018.

In our records the N57D30B is the engine for the F15 X5 xDrive35d, which makes the match simple. Still, check the code on your old engine or send us your VIN.

Your car has all-wheel drive or is an X model, so the sump, the oil pickup and some brackets can differ from the rear-drive cars. Tell us the full model so we send the right set-up.

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 N57 Engines · Search N57D30B in the shop

What is in the N55 BMW cooling and exhaust kit?

The N55 BMW cooling and exhaust kit includes: Radiator hoses made for this swap; Intercooler pipe set; Downpipe and flex section; Expansion tank adapter; Temperature sender adapter.

It is made for the BMW E36, BMW E46 and BMW E39 (1990–2005), and replaces the M52, M54 and M50. Gearbox set-ups we support are the ZF GS6 and Getrag 420G.

This kit costs about 450 € to 740 €, depending on the exact listing. The engine is not included, so you can use your own N55B30 or buy one from our yard.

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 are not sure which kit you need, tell us your vehicle, its year and its current engine and gearbox. We help for free.

See all N55 BMW Conversion Kits · Conversion guide

What should I check on a used BMW N57 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 N57 diesel, a fitter usually checks the turbo for shaft play, the intake for heavy oil or soot, the injector seals and the glow plugs. These parts are easy to check before fitting and easy to change if needed.

Ask the desk for more pictures of any listing. We are happy to show the stamp, the ports and the ancillaries before you decide. 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 N57 Engines · Inspection certificate

How much does a used BMW N47D20C engine cost?

A used BMW N47D20C engine in our yard usually costs between 1.400 € and 2.350 €. 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 N47 Engines · Search N47D20C in the shop

What is the BMW N55B30 engine?

The BMW N55B30 is a 3.0 liter (2,979 cc) petrol engine from the N55 family. It has an inline 6, DOHC, 24 valve layout with a twin-scroll turbocharger, and makes 225 kW (306 HP) with 400 Nm of torque. BMW built it from 2010 to 2017 and it meets the Euro 5 emission standard.

You find the N55B30 in the BMW F30 335i, BMW F31 335i, BMW E92 335i, BMW F32 435i, BMW F20 M135i, BMW F15 X5 xDrive35i and BMW F25 X3 xDrive35i. What we list: BMW N55 3.0 single-turbo petrol engines for F30 335i, M135i and X5 35i.

At Autowerke Engines every N55B30 is a real used engine from our yard in Hamburg. 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. 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 N55 Engines · Search N55B30 in the shop

How much is a replacement N20B20 engine for a BMW F30 328i?

A used N20B20 for the BMW F30 328i costs from about 2.000 € to 3.200 € 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 N20B20 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 N20 Engines · Search N20B20 in the shop

How long does delivery of an N57D30S 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 N57 Engines · Search N57D30S in the shop

How much is a replacement N20B20 engine for a BMW F20 125i?

A used N20B20 for the BMW F20 125i costs from about 2.000 € to 3.200 € 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 N20B20 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 N20 Engines · Search N20B20 in the shop

What is the difference between the N57D30B and other N57 engines?

The N57D30B makes 230 kW (313 HP) and 630 Nm. The other N57 engines are: N57D30A with 190 kW (258 HP) and 560 Nm (2010 to 2017); N57D30S with 280 kW (381 HP) and 740 Nm (2012 to 2018).

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 N57 Engines · Search N57D30B in the shop

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.
• Valvetronic — BMW's variable valve lift system. It controls engine load with the intake valves instead of a throttle plate, improving economy.
• Direct injection — Fuel is injected directly into the cylinder instead of the intake port. It improves efficiency but can cause carbon build-up on the intake valves.
• Wastegate — A valve that lets exhaust gas bypass the turbine to control boost pressure. Worn wastegates rattle and can cause boost faults.
• DPF — Diesel particulate filter. It traps soot and burns it off during regeneration, which needs longer journeys.
• EGR — Exhaust gas recirculation. It feeds some exhaust back into the intake to reduce NOx emissions but builds up soot.
• Swirl flaps — Flaps in the intake manifold that create swirl at low revs. On some BMW diesels they can break and enter the engine.
• Common rail — A diesel injection system with a high-pressure fuel rail feeding all injectors. It allows precise, multiple injections per cycle.
• 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.
• Rear-mounted timing chain — A timing chain at the gearbox end of the engine. Replacing it normally requires removing the engine.
• Electric water pump — A water pump driven by an electric motor. It needs a diagnostic bleeding routine when the system is refilled.
• TU — Technical Update, BMW's suffix for a revised version of an engine.

Our verdict

The BMW F25 X3 and F26 X4 offers a wide choice of engines, and the right replacement depends on your exact model, build date and gearbox. Confirm the code with your VIN, choose a unit with known history, replace the known weak parts while it is out, and the car will be back on the road for years.

See every BMW F25 X3 and F26 X4 engine in stock, or ask the Hamburg desk to check your VIN.

Model-by-model engine guides

• BMW X3 28i (F25) engine: which one, problems and replacement
• BMW X3 35i (F25) engine: which one, problems and replacement