BMW E24 and E63/E64 6 Series engines: every engine, fitment and price

The first 6 Series (E24, 1976 to 1989) used the M30, M90 and M88. The second (E63 and E64, 2003 to 2010) used the N52, N53, N62 and M57 and the S85 in the M6.

In total, 12 model and engine combinations are listed for the BMW E24 and E63/E64 6 Series in our data, using 5 engine families: M30, M88 and S38, N62 and S85. Production covered 1976–1989, 2003–2010 and 2004–2010. We currently hold 75 engines that suit these cars.

Every BMW E24 and E63/E64 6 Series engine at a glance

BMW E24 and E63/E64 6 Series: petrol engines

M30 in the BMW E24 and E63/E64 6 Series

E24 525i: M30B25, 2.5 L, 150 hp and 215 Nm (1968–1994).

The E24 628CSi uses the M30B28, a 2.8 L inline-6 rated at 184 hp and 240 Nm, built 1968–1994.

E24 630CS: M30B30, 3.0 L, 188 hp and 260 Nm (1968–1994).

The E24 633CSi uses the M30B32, a 3.2 L inline-6 rated at 197 hp and 285 Nm, built 1976–1984.

E24 635CSi: M30B34, 3.4 L, 218 hp and 310 Nm (1982–1994).

Introduced in 1968 at 2.5 and 2.8 litres, the M30 kept its iron block and single chain-driven camshaft throughout.

On the M30, our workshop watches for head gasket and cracked heads, cooling system age and rocker arm wear. Valve clearances are set with eccentric adjusters at about 0.30 mm cold. Keep the cooling system fresh and the fan clutch healthy.

Read our full M30 guide

M88 and S38 in the BMW E24 and E63/E64 6 Series

For the E24 M635CSi, BMW fitted the M88 — 3.5 L, naturally aspirated, 286 hp.

The M88 began in the M1 in 1978 and moved into the M635CSi and E28 M5 as the M88/3.

On the M88 and S38, our workshop watches for valve clearances, timing chain guides and oil pump drive nut. The 3.8 litre S38B38 uses a dual-mass flywheel; check its condition when buying a complete unit.

Read our full M88 and S38 guide

M30 in the BMW E24 and E63/E64 6 Series

E24 635CSi: M90, 3.5 L, 218 hp and 310 Nm (1979–1986).

Introduced in 1968 at 2.5 and 2.8 litres, the M30 kept its iron block and single chain-driven camshaft throughout.

On the M30, our workshop watches for head gasket and cracked heads, cooling system age and rocker arm wear. Valve clearances are set with eccentric adjusters at about 0.30 mm cold. Keep the cooling system fresh and the fan clutch healthy.

Read our full M30 guide

N62 in the BMW E24 and E63/E64 6 Series

E63 645Ci: N62B44, 4.4 L, 333 hp and 450 Nm (2001–2005).

For the E63 645Ci, BMW fitted the N62B40 — 4.0 L, naturally aspirated, 306 hp.

The E63 650i uses the N62B48, a 4.8 L V8 rated at 367 hp and 490 Nm, built 2005–2010. See every N62B48 in stock.

BMW launched the N62 in the E65 7 Series with Valvetronic and double VANOS on both banks, the first V8 with fully variable valve lift.

On the N62, our workshop watches for valve stem seals, alternator bracket gasket and valve cover gaskets. Fit new valve stem seals, the alternator bracket gasket and valve cover gaskets with a used N62 if they have not been done. Access is far easier with the engine out.

Read our full N62 guide

We have 27 N62 engines that suit the BMW E24 and E63/E64 6 Series, from 2.211,00 €.

BMW E24 and E63/E64 6 Series: m and performance engines

S85 in the BMW E24 and E63/E64 6 Series

E63 M6: S85B50, 5.0 L, 507 hp and 520 Nm (2005–2010). See every S85B50 in stock.

E64 M6: S85B50, 5.0 L, 507 hp and 520 Nm (2005–2010). See every S85B50 in stock.

BMW M launched the S85 in 2005 with individual throttle bodies, high-pressure double VANOS and a bedplate block.

On the S85, our workshop watches for rod bearings, throttle actuators and high-pressure vanos. Fit new rod bearings when fitting a used S85 unless they were recently replaced.

Read our full S85 guide

We have 28 S85 engines that suit the BMW E24 and E63/E64 6 Series, from 9.122,00 €.

Will it fit? BMW E24 and E63/E64 6 Series engine questions

Will the M30B25 fit my BMW E24 525i?

Yes, the BMW E24 525i left the factory with the M30B25, so an M30B25 from another car is the direct replacement. The first 6 Series was built 1976–1989, and the M30B25 was produced 1968–1994, 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 E24 525i?

We do not have an M30B25 on the shelf for the E24 525i 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 M30B28 fit my BMW E24 628CSi?

The M30B28 is the original engine for the BMW E24 628CSi, which makes it the straightforward choice. The first 6 Series was built 1976–1989, and the M30B28 was produced 1968–1994, 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 E24 628CSi?

We do not have an M30B28 on the shelf for the E24 628CSi 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 M30B30 fit my BMW E24 630CS?

The M30B30 is the original engine for the BMW E24 630CS, which makes it the straightforward choice. The first 6 Series was built 1976–1989, and the M30B30 was produced 1968–1994, 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 E24 630CS?

We do not have an M30B30 on the shelf for the E24 630CS 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 M30B32 fit my BMW E24 633CSi?

For the BMW E24 633CSi, the M30B32 is the factory engine and the one to order. The first 6 Series was built 1976–1989, and the M30B32 was produced 1976–1984, 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 E24 633CSi?

We do not have an M30B32 on the shelf for the E24 633CSi 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 M88 fit my BMW E24 M635CSi?

For the BMW E24 M635CSi, the M88 is the factory engine and the one to order. The first 6 Series was built 1976–1989, and the M88 was produced 1978–1988, 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 E24 M635CSi?

We do not have an M88 on the shelf for the E24 M635CSi 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 M90 fit my BMW E24 635CSi?

For the BMW E24 635CSi, the M90 is the factory engine and the one to order. The first 6 Series was built 1976–1989, and the M90 was produced 1979–1986, 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 E24 635CSi?

We do not have an M90 on the shelf for the E24 635CSi 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 M30B34 fit my BMW E24 635CSi?

Yes, the BMW E24 635CSi left the factory with the M30B34, so an M30B34 from another car is the direct replacement. The first 6 Series was built 1976–1989, and the M30B34 was produced 1982–1994, 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 E24 635CSi?

We do not have an M30B34 on the shelf for the E24 635CSi 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 N62B44 fit my BMW E63 645Ci?

Yes, the BMW E63 645Ci left the factory with the N62B44, so an N62B44 from another car is the direct replacement. The second 6 Series coupé was built 2003–2010, and the N62B44 was produced 2001–2005, 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 E63 645Ci?

We have 1 N62B44 engine from E63 donor cars, priced from 5.595,00 €. 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 N62B40 fit my BMW E63 645Ci?

Yes, the BMW E63 645Ci left the factory with the N62B40, so an N62B40 from another car is the direct replacement. The second 6 Series coupé was built 2003–2010, and the N62B40 was produced 2005–2010, 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 E63 645Ci?

We have 1 N62B40 engine from E63 donor cars, priced from 5.369,00 €. 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 E24 and E63/E64 6 Series

Owners often ask whether a more powerful engine from another BMW E24 and E63/E64 6 Series model can be fitted. These answers show what each upgrade involves.

Can I fit the S85B50 from the E63 M6 into an E24 525i?

It is a conversion rather than a replacement. The S85B50 is a V10 and the M30B25 an inline-6, so mounts, sump, cooling, exhaust, wiring and ECU all change. The gain is 357 hp and 305 Nm. In Germany and most of Europe a swap must be inspected and registered; check with your testing station first.

Can I fit the S85B50 from the E64 M6 into an E24 525i?

It is a conversion rather than a replacement. The S85B50 is a V10 and the M30B25 an inline-6, so mounts, sump, cooling, exhaust, wiring and ECU all change. The gain is 357 hp and 305 Nm. In Germany and most of Europe a swap must be inspected and registered; check with your testing station first.

Can I fit the N62B48 from the E63 650i into an E24 628CSi?

It is a conversion rather than a replacement. The N62B48 is a V8 and the M30B28 an inline-6, so mounts, sump, cooling, exhaust, wiring and ECU all change. The gain is 183 hp and 250 Nm. In Germany and most of Europe a swap must be inspected and registered; check with your testing station first.

Can I fit the M88 from the E24 M635CSi into an E24 628CSi?

It is possible, and it is one of the more common upgrades. Both engines are petrol inline-6 units, so the engine bay and mounting points are similar, but the M88 needs its own wiring harness and ECU, the matching gearbox or clutch, and often a different sump, cooling and exhaust. The gain is 102 hp and 100 Nm. In Germany and most of Europe a swap must be inspected and registered; check with your testing station first.

Can I fit the S85B50 from the E63 M6 into an E24 630CS?

It is a conversion rather than a replacement. The S85B50 is a V10 and the M30B30 an inline-6, so mounts, sump, cooling, exhaust, wiring and ECU all change. The gain is 319 hp and 260 Nm. In Germany and most of Europe a swap must be inspected and registered; check with your testing station first.

Can I fit the S85B50 from the E64 M6 into an E24 630CS?

It is a conversion rather than a replacement. The S85B50 is a V10 and the M30B30 an inline-6, so mounts, sump, cooling, exhaust, wiring and ECU all change. The gain is 319 hp and 260 Nm. In Germany and most of Europe a swap must be inspected and registered; check with your testing station first.

Can I fit the N62B40 from the E63 645Ci into an E24 633CSi?

It is a conversion rather than a replacement. The N62B40 is a V8 and the M30B32 an inline-6, so mounts, sump, cooling, exhaust, wiring and ECU all change. The gain is 109 hp and 105 Nm. In Germany and most of Europe a swap must be inspected and registered; check with your testing station first.

Can I fit the S85B50 from the E63 M6 into an E24 633CSi?

It is a conversion rather than a replacement. The S85B50 is a V10 and the M30B32 an inline-6, so mounts, sump, cooling, exhaust, wiring and ECU all change. The gain is 310 hp and 235 Nm. In Germany and most of Europe a swap must be inspected and registered; check with your testing station first.

Can I fit the S85B50 from the E63 M6 into an E24 M635CSi?

It is a conversion rather than a replacement. The S85B50 is a V10 and the M88 an inline-6, so mounts, sump, cooling, exhaust, wiring and ECU all change. The gain is 221 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 S85B50 from the E64 M6 into an E24 M635CSi?

It is a conversion rather than a replacement. The S85B50 is a V10 and the M88 an inline-6, so mounts, sump, cooling, exhaust, wiring and ECU all change. The gain is 221 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 N62B48 from the E63 650i into an E24 635CSi?

It is a conversion rather than a replacement. The N62B48 is a V8 and the M30B34 an inline-6, so mounts, sump, cooling, exhaust, wiring and ECU all change. The gain is 149 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 S85B50 from the E63 M6 into an E24 635CSi?

It is a conversion rather than a replacement. The S85B50 is a V10 and the M30B34 an inline-6, so mounts, sump, cooling, exhaust, wiring and ECU all change. The gain is 289 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 S85B50 from the E63 M6 into an E63 645Ci?

It is a conversion rather than a replacement. The S85B50 is a V10 and the N62B40 a V8, so mounts, sump, cooling, exhaust, wiring and ECU all change. The gain is 201 hp and 130 Nm. In Germany and most of Europe a swap must be inspected and registered; check with your testing station first.

Can I fit the S85B50 from the E64 M6 into an E63 645Ci?

It is a conversion rather than a replacement. The S85B50 is a V10 and the N62B40 a V8, so mounts, sump, cooling, exhaust, wiring and ECU all change. The gain is 201 hp and 130 Nm. In Germany and most of Europe a swap must be inspected and registered; check with your testing station first.

Can I fit the S85B50 from the E63 M6 into an E63 650i?

It is a conversion rather than a replacement. The S85B50 is a V10 and the N62B48 a V8, so mounts, sump, cooling, exhaust, wiring and ECU all change. The gain is 140 hp and 30 Nm. In Germany and most of Europe a swap must be inspected and registered; check with your testing station first.

Can I fit the S85B50 from the E64 M6 into an E63 650i?

It is a conversion rather than a replacement. The S85B50 is a V10 and the N62B48 a V8, so mounts, sump, cooling, exhaust, wiring and ECU all change. The gain is 140 hp and 30 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 E24 and E63/E64 6 Series

• The M635CSi uses the M88/3.
• The M6 uses the S85.

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.

M30: M30 owners often fit a 3.5 litre unit in place of a 2.8 or 3.0, or build a turbocharged M30 using the strong bottom end. Head work and cam upgrades suit naturally aspirated builds.

M88 and S38: Builders fit S38B38 cranks into 3.6 litre engines, and many E30 or E34 projects use an S38 with motorsport camshafts. Keep receipts; buyers expect them.

M30: M30 owners often fit a 3.5 litre unit in place of a 2.8 or 3.0, or build a turbocharged M30 using the strong bottom end. Head work and cam upgrades suit naturally aspirated builds.

N62: Gains from remaps and exhaust work are modest. Most N62 buyers want a reliable replacement for an X5, 5 Series, 7 Series or Range Rover.

S85: Exhausts and remaps add modest gains. Most owners keep the S85 standard.

Known problems by engine in the BMW E24 and E63/E64 6 Series

M30

• Head gasket and cracked heads. Do a compression test and look for bubbles in the expansion tank with the engine running.
• Cooling system age. Check the fan clutch resistance hot and the radiator for blocked cores.
• Rocker arm wear. Inspect the cam surface with the valve cover off.
• Timing chain tensioner. Listen for a cold-start rattle at the front of the engine.
• Oil pressure sender and leaks. Check for oil around the filter housing and the bellhousing.

M88 and S38

• Valve clearances. Ask for the last clearance check.
• Timing chain guides. Listen for start-up rattle at the front.
• Oil pump drive nut. Ask if the oil pump nut has been secured.
• Throttle bodies and sensors. Check for smooth idle and even cylinder balance.

M30

• Head gasket and cracked heads. Do a compression test and look for bubbles in the expansion tank with the engine running.
• Cooling system age. Check the fan clutch resistance hot and the radiator for blocked cores.
• Rocker arm wear. Inspect the cam surface with the valve cover off.
• Timing chain tensioner. Listen for a cold-start rattle at the front of the engine.
• Oil pressure sender and leaks. Check for oil around the filter housing and the bellhousing.

N62

• Valve stem seals. Watch the exhaust after a long idle; heavy smoke on the first press of the throttle is typical.
• Alternator bracket gasket. Look for oil at the back of the valley.
• Valve cover gaskets. Look for burnt oil on the manifolds.
• Valvetronic motors and eccentric shaft sensors. Read the fault memory for Valvetronic codes.
• Coolant transfer pipe. Pressure-test the cooling system.
• Timing chain guides. Listen for rattle on a cold start.

S85

• Rod bearings. Ask for the bearing replacement date and use oil analysis.
• Throttle actuators. Read throttle fault codes.
• High-pressure VANOS. Read VANOS fault codes.
• Oil leaks. Check below the sump and around the heads.

How to identify the right engine for your BMW E24 and E63/E64 6 Series

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 E24 and E63/E64 6 Series engine prices

Across 75 BMW E24 and E63/E64 6 Series engine units in our stock today, prices start at 2.211,00 € and reach 13.498,00 €. The median — the price in the middle of the range — is 10.427,00 €.

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 E24 and E63/E64 6 Series engine prices by model year

Engines from 2005–2009 have a median of 3.338,00 €, while units from 2020–2024 sit at 12.930,00 €. Newer engines usually cost more because they come from younger donor cars with lower mileage and later updates.

BMW E24 and E63/E64 6 Series 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 E24 and E63/E64 6 Series engines in stock now

Here is a selection of BMW E24 and E63/E64 6 Series engine engines currently on our shelves, photographed in the yard. Click any of them for the full photographs, mileage and specification.

BMW E63 650i N62B48 Engine 2008, 62,900 km3.338,00 €Mercedes-Benz W213 E63 S M177 Engine 2017, 143,100 km11.417,00 €BMW E64 M6 S85B50 Engine 2006, 28,400 km9.455,00 €BMW E63 M6 S85B50 Engine 2008, 112,300 km11.618,00 €BMW E63 650i N62B48 Engine 2007, 137,100 km2.663,00 €BMW E63 650i N62B48 Engine 2009, 30,100 km2.349,00 €Mercedes-Benz W213 E63 S M177 Engine 2021, 181,900 km12.930,00 €BMW E63 650i N62B48 Engine 2010, 80,200 km3.129,00 €BMW E63 M6 S85B50 Engine 2007, 113,200 km13.443,00 €Mercedes-Benz W213 E63 S M177 Engine 2017, 131,800 km9.402,00 €BMW E64 M6 S85B50 Engine 2010, 96,000 km13.252,00 €BMW E63 M6 S85B50 Engine 2007, 122,700 km10.414,00 €

BMW E63 650i N62B48 Engine 2008, 62,900 km — 3.338,00 €, reduced from 4.800,00 €. It comes from a 2008 donor car with 62,900 km, and 14 units are available. The listing shows every side of the engine and the fitted parts.

Mercedes-Benz W213 E63 S M177 Engine 2017, 143,100 km — 11.417,00 €, reduced from 12.800,00 €. It comes from a 2017 donor car with 143,100 km, and 30 units are available. Ask the desk for compression figures or extra photographs before you order.

BMW E64 M6 S85B50 Engine 2006, 28,400 km — 9.455,00 €, reduced from 10.350,00 €. It comes from a 2006 donor car with 28,400 km, and 14 units are available. We can confirm fitment against your VIN the same day.

BMW E63 M6 S85B50 Engine 2008, 112,300 km — 11.618,00 €, reduced from 12.200,00 €. It comes from a 2008 donor car with 112,300 km, and 17 units are available. Ask the desk for compression figures or extra photographs before you order.

BMW E63 650i N62B48 Engine 2007, 137,100 km — 2.663,00 €, reduced from 3.850,00 €. It comes from a 2007 donor car with 137,100 km, and 11 units are available. The listing shows every side of the engine and the fitted parts.

BMW E63 650i N62B48 Engine 2009, 30,100 km — 2.349,00 €, reduced from 3.100,00 €. It comes from a 2009 donor car with 30,100 km, and 16 units are available. The listing shows every side of the engine and the fitted parts.

Mercedes-Benz W213 E63 S M177 Engine 2021, 181,900 km — 12.930,00 €, reduced from 13.900,00 €. It comes from a 2021 donor car with 181,900 km, and 22 units are available. The listing shows every side of the engine and the fitted parts.

BMW E63 650i N62B48 Engine 2010, 80,200 km — 3.129,00 €, reduced from 4.000,00 €. It comes from a 2010 donor car with 80,200 km, and 14 units are available. Ask the desk for compression figures or extra photographs before you order.

BMW E63 M6 S85B50 Engine 2007, 113,200 km — 13.443,00 €, reduced from 14.600,00 €. It comes from a 2007 donor car with 113,200 km, and 5 units are available. The listing shows every side of the engine and the fitted parts.

Mercedes-Benz W213 E63 S M177 Engine 2017, 131,800 km — 9.402,00 €, reduced from 10.700,00 €. It comes from a 2017 donor car with 131,800 km, and 21 units are available. Ask the desk for compression figures or extra photographs before you order.

BMW E64 M6 S85B50 Engine 2010, 96,000 km — 13.252,00 €, reduced from 13.950,00 €. It comes from a 2010 donor car with 96,000 km, and 13 units are available. Ask the desk for compression figures or extra photographs before you order.

BMW E63 M6 S85B50 Engine 2007, 122,700 km — 10.414,00 €, reduced from 11.400,00 €. It comes from a 2007 donor car with 122,700 km, and 19 units are available. The listing shows every side of the engine and the fitted parts.

Buying checklist for a BMW E24 and E63/E64 6 Series 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. 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. 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.
13. 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.
14. 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.
15. 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.
16. 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.
17. Both cylinder banks. On a V engine, check compression, plugs and coils on both banks. Faults on one bank alone are common and easy to miss on a quick test.
18. Both cylinder banks. On the V10, check both banks separately for compression, throttle actuator faults and VANOS codes.

Fitting an engine to your BMW E24 and E63/E64 6 Series

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. Reset VANOS adaptations. Clear the VANOS adaptations so the ECU learns the camshaft positions of the new engine.
11. Teach the Valvetronic limit stops. Run the Valvetronic learning routine so the ECU knows the eccentric shaft limits.
12. 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.
13. 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 E24 and E63/E64 6 Series

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.

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.

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 the engine in your BMW E24 and E63/E64 6 Series?

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.

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.

Delivery, warranty and payment

Every BMW E24 and E63/E64 6 Series 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.

A 12-month warranty covers eligible internal failure when the engine is fitted by a qualified workshop with new fluids and filters. You can pay by card, bank transfer or crypto and receive the invoice by email straight away.

We deliver BMW E24 and E63/E64 6 Series 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 E24 and E63/E64 6 Series engines

Will the M30B35 engine fit my BMW E24 635CSi?

Yes, if your BMW E24 635CSi was built with the M30B35. BMW used this 3.5 liter (3,430 cc) petrol engine with 155 kW (211 HP) in the E24 635CSi from about 1982 to 1993.

In our records the M30B35 is the engine for the E24 635CSi, which makes the match simple. Still, check the code on your old engine or send us your VIN.

Also tell us if your E24 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 M30 Engines · Search M30B35 in the shop

How much is a replacement M30B35 engine for a BMW E24 635CSi?

A used M30B35 for the BMW E24 635CSi costs from about 1.800 € to 2.950 € 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 M30B35 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 M30 Engines · Search M30B35 in the shop

Will the M30B34 engine fit my BMW E24 M635CSi?

Yes, if your BMW E24 M635CSi was built with the M30B34. BMW used this 3.4 liter (3,430 cc) petrol engine with 160 kW (218 HP) in the E24 M635CSi from about 1985 to 1988.

In our records the M30B34 is the engine for the E24 M635CSi, which makes the match simple. Still, check the code on your old engine or send us your VIN.

Also tell us if your E24 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 M30 Engines · Search M30B34 in the shop

How much is a replacement M30B34 engine for a BMW E24 M635CSi?

A used M30B34 for the BMW E24 M635CSi costs from about 2.150 € to 3.450 € in our yard. The price depends on the year, the mileage and the parts that come with the engine.

Shipping is a flat 249 € per order. It is added once at checkout and printed on the invoice, so there is no extra fee later. Inside the EU there is no import duty. Outside the EU, the receiver pays local duty and VAT.

A replacement engine is often much cheaper than rebuilding a damaged one, and much faster. The M30B34 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 M30 Engines · Search M30B34 in the shop

Will the N62B48 engine fit my BMW E63 650i?

Yes, if your BMW E63 650i was built with the N62B48. BMW used this 4.8 liter (4,799 cc) petrol engine with 270 kW (367 HP) in the E63 650i from about 2005 to 2010.

In our records the N62B48 is the engine for the E63 650i, which makes the match simple. Still, check the code on your old engine or send us your VIN.

Also tell us if your E63 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 N62 Engines · Search N62B48 in the shop

How much is a replacement N62B48 engine for a BMW E63 650i?

A used N62B48 for the BMW E63 650i costs from about 2.150 € to 3.450 € in our yard. The price depends on the year, the mileage and the parts that come with the engine.

Shipping is a flat 249 € per order. It is added once at checkout and printed on the invoice, so there is no extra fee later. Inside the EU there is no import duty. Outside the EU, the receiver pays local duty and VAT.

A replacement engine is often much cheaper than rebuilding a damaged one, and much faster. The N62B48 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 N62 Engines · Search N62B48 in the shop

Will the S85B50 engine fit my BMW E63 M6?

Yes, if your BMW E63 M6 was built with the S85B50. BMW used this 5.0 liter (4,999 cc) petrol engine with 373 kW (507 HP) in the E63 M6 from about 2005 to 2010.

In our records the S85B50 is the engine for the E63 M6, which makes the match simple. Still, check the code on your old engine or send us your VIN.

Also tell us if your E63 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 S85 Engines · Search S85B50 in the shop

How much is a replacement S85B50 engine for a BMW E63 M6?

A used S85B50 for the BMW E63 M6 costs from about 9.050 € to 13.700 € in our yard. The price depends on the year, the mileage and the parts that come with the engine.

Shipping is a flat 249 € per order. It is added once at checkout and printed on the invoice, so there is no extra fee later. Inside the EU there is no import duty. Outside the EU, the receiver pays local duty and VAT.

A replacement engine is often much cheaper than rebuilding a damaged one, and much faster. The S85B50 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 S85 Engines · Search S85B50 in the shop

Will the S85B50 engine fit my BMW E64 M6?

Yes, if your BMW E64 M6 was built with the S85B50. BMW used this 5.0 liter (4,999 cc) petrol engine with 373 kW (507 HP) in the E64 M6 from about 2005 to 2010.

In our records the S85B50 is the engine for the E64 M6, which makes the match simple. Still, check the code on your old engine or send us your VIN.

Also tell us if your E64 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 S85 Engines · Search S85B50 in the shop

How much is a replacement S85B50 engine for a BMW E64 M6?

A used S85B50 for the BMW E64 M6 costs from about 9.050 € to 13.700 € in our yard. The price depends on the year, the mileage and the parts that come with the engine.

Shipping is a flat 249 € per order. It is added once at checkout and printed on the invoice, so there is no extra fee later. Inside the EU there is no import duty. Outside the EU, the receiver pays local duty and VAT.

A replacement engine is often much cheaper than rebuilding a damaged one, and much faster. The S85B50 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 S85 Engines · Search S85B50 in the shop

Questions about the engines in the BMW E24 and E63/E64 6 Series

How long does delivery of an N62B48 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 N62 Engines · Search N62B48 in the shop

Will the N62B48 engine fit my BMW E60 550i?

Yes, if your BMW E60 550i was built with the N62B48. BMW used this 4.8 liter (4,799 cc) petrol engine with 270 kW (367 HP) in the E60 550i from about 2005 to 2010.

In our records the N62B48 is the engine for the E60 550i, which makes the match simple. Still, check the code on your old engine or send us your VIN.

Also tell us if your E60 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 N62 Engines · Search N62B48 in the shop

How do I know a used S85B50 engine is in good shape?

The photos on each listing show the actual engine, not a stock picture. The yard checks the code, records what is bolted on, and seals the openings before the engine is offered. An inspection certificate for the unit can travel with the order when you ask for it.

When you look at a listing, check the recorded mileage, the year and the photos of the ports and the stamp. Ask for photos of anything you want to see closer. Ask the desk for more pictures of any listing. We are happy to show the stamp, the ports and the ancillaries before you decide.

On a petrol engine like the S85B50, 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 S85 Engines · Search S85B50 in the shop

Is the BMW M30B35 a diesel or petrol engine?

The M30B35 is a petrol engine. It is a 3.5 liter (3,430 cc) inline 6, SOHC, 12 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 M30 Engines · Search M30B35 in the shop

How much power and torque does the BMW N62B48 have?

From the factory the BMW N62B48 makes 270 kW (367 HP) and 490 Nm of torque. It is a 4.8 liter (4,799 cc) V8, DOHC, 32 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 N62B48 on our site lists its year and mileage. You can ask for extra photos, a close-up of the code stamp or a short video before you order.

See all N62 Engines · Search N62B48 in the shop

How much power and torque does the BMW M30B35 have?

From the factory the BMW M30B35 makes 155 kW (211 HP) and 305 Nm of torque. It is a 3.5 liter (3,430 cc) inline 6, SOHC, 12 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 M30B35 on our site lists its year and mileage. You can ask for extra photos, a close-up of the code stamp or a short video before you order.

See all M30 Engines · Search M30B35 in the shop

What comes with a used M30B34 engine?

Each M30B34 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 M30 Engines · Search M30B34 in the shop

What is the difference between the M30B35 and other M30 engines?

The M30B35 makes 155 kW (211 HP) and 305 Nm. The other M30 engines are: M30B34 with 160 kW (218 HP) and 310 Nm (1985 to 1988).

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 M30 Engines · Search M30B35 in the shop

Will the S85B50 engine fit my BMW E61 M5?

Yes, if your BMW E61 M5 was built with the S85B50. BMW used this 5.0 liter (4,999 cc) petrol engine with 373 kW (507 HP) in the E61 M5 from about 2005 to 2010.

In our records the S85B50 is the engine for the E61 M5, which makes the match simple. Still, check the code on your old engine or send us your VIN.

Also tell us if your E61 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 S85 Engines · Search S85B50 in the shop

Which years were BMW N62 engines made?

BMW built the N62 engines we list from about 2001 to 2010. The N62B48 ran from 2005 to 2010. The N62B44 ran from 2001 to 2005.

They went into chassis E60, E65, E70, E63 and E53. 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 N62 Engines

Will the N62B48 engine fit my BMW E70 X5 4.8i?

Yes, if your BMW E70 X5 4.8i was built with the N62B48. BMW used this 4.8 liter (4,799 cc) petrol engine with 270 kW (367 HP) in the E70 X5 4.8i from about 2005 to 2010.

In our records the N62B48 is the engine for the E70 X5 4.8i, 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 N62 Engines · Search N62B48 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.
• 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

The BMW E24 and E63/E64 6 Series 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 E24 and E63/E64 6 Series engine in stock, or ask the Hamburg desk to check your VIN.

Model-by-model engine guides

• BMW M6 (E63 and E64) engine: which one, problems and replacement