The first two 5 Series generations, the E12 (1972 to 1981) and E28 (1981 to 1988), used the M10 four, the M20 and M30 sixes, the M21 turbodiesel and, in the M535i and M5, the M90, M30B34 and M88/3.
Buyers are restoring classics or looking for a donor engine for a swap. This guide covers every engine and the period-correct options.
In total, 13 model and engine combinations are listed for the BMW E12 and E28 5 Series in our data, using 6 engine families: M10, M30, M20, M88 and S38 and M21 and M41. Production covered 1972–1981 and 1981–1988. We currently hold 26 engines that suit these cars.
Every BMW E12 and E28 5 Series engine at a glance
| Model | Engine code | Fuel | Power | Torque | Years |
|---|---|---|---|---|---|
| E12 518 | M10B18 | Petrol | 105 hp | 145 Nm | 1962–1988 |
| E12 520 | M10B20 | Petrol | 125 hp | 170 Nm | 1962–1988 |
| E12 525 | M30B25 | Petrol | 150 hp | 215 Nm | 1968–1994 |
| E12 M535i | M90 | Petrol | 218 hp | 310 Nm | 1979–1986 |
| E28 520 | M10B20 | Petrol | 125 hp | 170 Nm | 1962–1988 |
| E28 525i | M30B25 | Petrol | 150 hp | 215 Nm | 1968–1994 |
| E28 528i | M30B28 | Petrol | 184 hp | 240 Nm | 1968–1994 |
| E28 533i | M30B32 | Petrol | 197 hp | 285 Nm | 1976–1984 |
| E28 520i | M20B20 | Petrol | 129 hp | 164 Nm | 1977–1992 |
| E28 M5 | M88 | Petrol | 286 hp | 340 Nm | 1978–1988 |
| E28 525e | M20B27 | Petrol | 125 hp | 240 Nm | 1982–1988 |
| E28 535i | M30B34 | Petrol | 218 hp | 310 Nm | 1982–1994 |
| E28 524td | M21D24 | Diesel | 115 hp | 220 Nm | 1983–1991 |
BMW E12 and E28 5 Series: petrol engines
M10 in the BMW E12 and E28 5 Series
For the E12 518, BMW fitted the M10B18 — 1.8 L, naturally aspirated, 105 hp.
The E12 520 uses the M10B20, a 2.0 L inline-4 rated at 125 hp and 170 Nm, built 1962–1988.
The E28 520 uses the M10B20, a 2.0 L inline-4 rated at 125 hp and 170 Nm, built 1962–1988.
BMW designed the M10 under Alex von Falkenhausen with a canted block, a chain-driven camshaft and a crossflow aluminium head.
On the M10, our workshop watches for camshaft and rocker wear, timing chain guides and tensioner and warped head after overheating. Valve clearance is adjusted cold with eccentric adjusters on the rocker arms. Fit a new spray bar if the old one is blocked or loose.
M30 in the BMW E12 and E28 5 Series
For the E12 525, BMW fitted the M30B25 — 2.5 L, naturally aspirated, 150 hp.
The E28 525i uses the M30B25, a 2.5 L inline-6 rated at 150 hp and 215 Nm, built 1968–1994.
E28 528i: M30B28, 2.8 L, 184 hp and 240 Nm (1968–1994).
The E28 533i uses the M30B32, a 3.2 L inline-6 rated at 197 hp and 285 Nm, built 1976–1984.
E28 535i: 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.
M30 in the BMW E12 and E28 5 Series
For the E12 M535i, BMW fitted the M90 — 3.5 L, naturally aspirated, 218 hp.
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.
M20 in the BMW E12 and E28 5 Series
For the E28 520i, BMW fitted the M20B20 — 2.0 L, naturally aspirated, 129 hp.
E28 525e: M20B27, 2.7 L, 125 hp and 240 Nm (1982–1988).
The M20 arrived in the E12 520/6 and E21 320/6 as a 2.0 litre with a single belt-driven camshaft.
On the M20, our workshop watches for timing belt failure, cylinder head cracks and rocker arm and shaft wear. Valve clearance is set cold at about 0.25 mm with eccentric adjusters. Use a new head bolt set whenever the head comes off.
M88 and S38 in the BMW E12 and E28 5 Series
For the E28 M5, 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
BMW E12 and E28 5 Series: diesel engines
M21 and M41 in the BMW E12 and E28 5 Series
E28 524td: M21D24, 2.4 L, 115 hp and 220 Nm (1983–1991).
BMW built the M21 from the M20 petrol six with a diesel head, a timing belt and a turbocharger.
On the M21 and M41, our workshop watches for injection pump, head cracks and timing belt (m21). Change the M21 timing belt when fitting a used engine.
Read our full M21 and M41 guide
Will it fit? BMW E12 and E28 5 Series engine questions
Will the M10B18 fit my BMW E12 518?
The M10B18 is the original engine for the BMW E12 518, which makes it the straightforward choice. The first 5 Series was built 1972–1981, and the M10B18 was produced 1962–1988, 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 E12 518?
We do not have an M10B18 on the shelf for the E12 518 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 M10B20 fit my BMW E12 520?
Yes, the BMW E12 520 left the factory with the M10B20, so an M10B20 from another car is the direct replacement. The first 5 Series was built 1972–1981, and the M10B20 was produced 1962–1988, 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 E12 520?
We do not have an M10B20 on the shelf for the E12 520 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 M30B25 fit my BMW E12 525?
Yes, the BMW E12 525 left the factory with the M30B25, so an M30B25 from another car is the direct replacement. The first 5 Series was built 1972–1981, 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 E12 525?
We do not have an M30B25 on the shelf for the E12 525 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 E12 M535i?
The M90 is the original engine for the BMW E12 M535i, which makes it the straightforward choice. The first 5 Series was built 1972–1981, 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 E12 M535i?
We do not have an M90 on the shelf for the E12 M535i 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 M10B20 fit my BMW E28 520?
The M10B20 is the original engine for the BMW E28 520, which makes it the straightforward choice. The second 5 Series was built 1981–1988, and the M10B20 was produced 1962–1988, 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 E28 520?
We do not have an M10B20 on the shelf for the E28 520 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 M30B25 fit my BMW E28 525i?
For the BMW E28 525i, the M30B25 is the factory engine and the one to order. The second 5 Series was built 1981–1988, 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 E28 525i?
We do not have an M30B25 on the shelf for the E28 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 E28 528i?
For the BMW E28 528i, the M30B28 is the factory engine and the one to order. The second 5 Series was built 1981–1988, 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 E28 528i?
We do not have an M30B28 on the shelf for the E28 528i 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 E28 533i?
Yes, the BMW E28 533i left the factory with the M30B32, so an M30B32 from another car is the direct replacement. The second 5 Series was built 1981–1988, 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 E28 533i?
We do not have an M30B32 on the shelf for the E28 533i 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 E28 M5?
Yes, the BMW E28 M5 left the factory with the M88, so an M88 from another car is the direct replacement. The second 5 Series was built 1981–1988, 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 E28 M5?
We do not have an M88 on the shelf for the E28 M5 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 M20B27 fit my BMW E28 525e?
The M20B27 is the original engine for the BMW E28 525e, which makes it the straightforward choice. The second 5 Series was built 1981–1988, and the M20B27 was produced 1982–1988, 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 E28 525e?
We do not have an M20B27 on the shelf for the E28 525e 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 E28 535i?
The M30B34 is the original engine for the BMW E28 535i, which makes it the straightforward choice. The second 5 Series was built 1981–1988, 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 E28 535i?
We do not have an M30B34 on the shelf for the E28 535i 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 M21D24 fit my BMW E28 524td?
Yes, the BMW E28 524td left the factory with the M21D24, so an M21D24 from another car is the direct replacement. The second 5 Series was built 1981–1988, and the M21D24 was produced 1983–1991, so check that your car's build date falls inside that window. Confirm the drive type (rear-drive or xDrive), the gearbox (manual or automatic) and the emissions standard, because these can change the sump, the flywheel and the software. Send us the VIN and we check all of it for you.
How much is a replacement engine for a BMW E28 524td?
We do not have an M21D24 on the shelf for the E28 524td 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.
Engine swap questions for the BMW E12 and E28 5 Series
Owners often ask whether a more powerful engine from another BMW E12 and E28 5 Series model can be fitted. These answers show what each upgrade involves.
Can I fit the M30B32 from the E28 533i into an E12 518?
It is a conversion rather than a replacement. The M30B32 is an inline-6 and the M10B18 an inline-4, so mounts, sump, cooling, exhaust, wiring and ECU all change. The gain is 92 hp and 140 Nm. In Germany and most of Europe a swap must be inspected and registered; check with your testing station first.
Can I fit the M20B27 from the E28 525e into an E12 518?
It is a conversion rather than a replacement. The M20B27 is an inline-6 and the M10B18 an inline-4, so mounts, sump, cooling, exhaust, wiring and ECU all change. The gain is 20 hp and 95 Nm. In Germany and most of Europe a swap must be inspected and registered; check with your testing station first.
Can I fit the M30B34 from the E28 535i into an E12 520?
It is a conversion rather than a replacement. The M30B34 is an inline-6 and the M10B20 an inline-4, so mounts, sump, cooling, exhaust, wiring and ECU all change. The gain is 93 hp and 140 Nm. In Germany and most of Europe a swap must be inspected and registered; check with your testing station first.
Can I fit the M90 from the E12 M535i into an E12 520?
It is a conversion rather than a replacement. The M90 is an inline-6 and the M10B20 an inline-4, so mounts, sump, cooling, exhaust, wiring and ECU all change. The gain is 93 hp and 140 Nm. In Germany and most of Europe a swap must be inspected and registered; check with your testing station first.
Can I fit the M90 from the E12 M535i into an E12 525?
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 M90 needs its own wiring harness and ECU, the matching gearbox or clutch, and often a different sump, cooling and exhaust. The gain is 68 hp and 95 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 E28 M5 into an E12 525?
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 136 hp and 125 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 E28 M5 into an E12 M535i?
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 68 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 M30B34 from the E28 535i into an E28 520?
It is a conversion rather than a replacement. The M30B34 is an inline-6 and the M10B20 an inline-4, so mounts, sump, cooling, exhaust, wiring and ECU all change. The gain is 93 hp and 140 Nm. In Germany and most of Europe a swap must be inspected and registered; check with your testing station first.
Can I fit the M90 from the E12 M535i into an E28 520?
It is a conversion rather than a replacement. The M90 is an inline-6 and the M10B20 an inline-4, so mounts, sump, cooling, exhaust, wiring and ECU all change. The gain is 93 hp and 140 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 E28 M5 into an E28 525i?
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 136 hp and 125 Nm. In Germany and most of Europe a swap must be inspected and registered; check with your testing station first.
Can I fit the M90 from the E12 M535i into an E28 525i?
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 M90 needs its own wiring harness and ECU, the matching gearbox or clutch, and often a different sump, cooling and exhaust. The gain is 68 hp and 95 Nm. In Germany and most of Europe a swap must be inspected and registered; check with your testing station first.
Can I fit the M90 from the E12 M535i into an E28 528i?
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 M90 needs its own wiring harness and ECU, the matching gearbox or clutch, and often a different sump, cooling and exhaust. The gain is 34 hp and 70 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 E28 M5 into an E28 528i?
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 M88 from the E28 M5 into an E28 533i?
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 89 hp and 55 Nm. In Germany and most of Europe a swap must be inspected and registered; check with your testing station first.
Can I fit the M90 from the E12 M535i into an E28 533i?
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 M90 needs its own wiring harness and ECU, the matching gearbox or clutch, and often a different sump, cooling and exhaust. The gain is 21 hp and 25 Nm. In Germany and most of Europe a swap must be inspected and registered; check with your testing station first.
Can I fit the M30B25 from the E12 525 into an E28 520i?
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 M30B25 needs its own wiring harness and ECU, the matching gearbox or clutch, and often a different sump, cooling and exhaust. The gain is 21 hp and 51 Nm. In Germany and most of Europe a swap must be inspected and registered; check with your testing station first.
Can I fit the M30B34 from the E28 535i into an E28 520i?
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 M30B34 needs its own wiring harness and ECU, the matching gearbox or clutch, and often a different sump, cooling and exhaust. The gain is 89 hp and 146 Nm. In Germany and most of Europe a swap must be inspected and registered; check with your testing station first.
Can I fit the M30B25 from the E28 525i into an E28 525e?
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 M30B25 needs its own wiring harness and ECU, the matching gearbox or clutch, and often a different sump, cooling and exhaust. The gain is 25 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 M90 from the E12 M535i into an E28 525e?
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 M90 needs its own wiring harness and ECU, the matching gearbox or clutch, and often a different sump, cooling and exhaust. The gain is 93 hp and 70 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 E28 M5 into an E28 535i?
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 68 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 M90 from the E12 M535i into an E28 524td?
It is a full conversion: the M90 runs on petrol and the M21D24 on diesel, so the fuel system, wiring, ECU, instrument coding and usually the gearbox change too. The gain is 103 hp and 90 Nm. In Germany and most of Europe a swap must be inspected and registered; check with your testing station first.
Can I fit the M20B27 from the E28 525e into an E28 524td?
It is a full conversion: the M20B27 runs on petrol and the M21D24 on diesel, so the fuel system, wiring, ECU, instrument coding and usually the gearbox change too. The gain is 10 hp and 20 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 E12 and E28 5 Series
- The E28 M5 uses the M88/3 (S38 in the US); matching numbers add significant value.
- M30 engines move easily between E12, E28 and E24 with the right mounts.
- The M20 uses a timing belt; change it on any used unit.
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.
M10: The M10 responds to a sharper camshaft, a 2.0 litre conversion on 1.8 cars and twin Weber or Dellorto carburettors. Historic racers often fit a 2002 tii head and injection. Keep the original block if the car's identity matters.
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.
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.
M20: The classic upgrade is the M20 'stroker': a 2.7 eta block and crank with a 885 head from a 325i, giving more torque without losing the rev range. Chip tuning on Motronic cars and a free-flowing exhaust add modest gains.
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.
M21 and M41: Few tuning options exist.
Known problems by engine in the BMW E12 and E28 5 Series
M10
- Camshaft and rocker wear. Remove the rocker cover and look at the lobes and rocker faces for pitting or a polished flat.
- Timing chain guides and tensioner. Listen at the front cover during the first seconds after a cold start.
- Warped head after overheating. Ask for a compression or leak-down test and check the coolant for oil.
- Valve stem seals. Watch the exhaust for the first ten seconds after a cold start.
- Oil leaks from age. Look under the bellhousing and around the front cover for fresh oil.
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.
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.
M20
- Timing belt failure. Ask for the date of the last belt and tensioner change. If there is no record, treat it as due.
- Cylinder head cracks. Pressure-test the cooling system and look for cracks when the cam cover is off.
- Rocker arm and shaft wear. Inspect rockers and clips with the cam cover removed.
- Oil spray bar and cam wear. Check the spray bar banjo bolts are tight and the holes clear.
- Water pump and thermostat. Look for coolant trails below the pump and on the belt cover.
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.
M21 and M41
- Injection pump. Check for smoke and starting problems.
- Head cracks. Pressure-test the system.
- Timing belt (M21). Ask for the belt history.
How to identify the right engine for your BMW E12 and E28 5 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 E12 and E28 5 Series engine prices
We currently hold 26 BMW E12 and E28 5 Series engine engines. The cheapest is 6.154,00 €, the most expensive 9.136,00 €, and half of them cost less than 7.700,00 €.
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 E12 and E28 5 Series engine prices by model year
| Model years | Units | From | Median | To |
|---|---|---|---|---|
| 1985–1989 | 6 | 6.164,00 € | 8.490,00 € | 8.850,00 € |
| 1990–1994 | 20 | 6.154,00 € | 7.700,00 € | 9.136,00 € |
Engines from 1985–1989 have a median of 8.490,00 €, while units from 1990–1994 sit at 7.700,00 €. Newer engines usually cost more because they come from younger donor cars with lower mileage and later updates.
BMW E12 and E28 5 Series engine prices by mileage
| Donor mileage | Units | From | Median |
|---|---|---|---|
| under 50,000 km | 4 | 6.630,00 € | 8.325,00 € |
| 50,000 to 100,000 km | 7 | 6.876,00 € | 8.372,00 € |
| 100,000 to 150,000 km | 6 | 7.444,00 € | 8.676,00 € |
| over 150,000 km | 8 | 6.154,00 € | 6.761,00 € |
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 E12 and E28 5 Series engines in stock now
Here is a selection of BMW E12 and E28 5 Series engine engines currently on our shelves, photographed in the yard. Click any of them for the full photographs, mileage and specification.
BMW E28 M5 S38B35 Engine 19886.849,00 €BMW E28 M5 S38B36 Engine 1992, 179,700 km6.761,00 €BMW E28 M5 S38B36 Engine 1990, 54,700 km7.018,00 €
BMW E28 M5 S38B36 Engine 1991, 119,200 km8.676,00 €
BMW E28 M5 S38B36 Engine 1990, 104,700 km8.851,00 €BMW E28 M5 S38B36 Engine 1992, 94,600 km9.136,00 €
BMW E28 M5 S38B36 Engine 1992, 168,400 km7.304,00 €
BMW E28 M5 S38B36 Engine 1991, 181,300 km6.154,00 €BMW E28 M5 S38B36 Engine 1992, 191,100 km6.508,00 €
BMW E28 M5 S38B36 Engine 1990, 121,700 km7.697,00 €
BMW E28 M5 S38B36 Engine 1988, 181,200 km8.490,00 €
BMW E28 M5 S38B36 Engine 1989, 43,800 km8.822,00 €BMW E28 M5 S38B35 Engine 1988 — 6.849,00 €, reduced from 8.000,00 €. It comes from a 1988 donor car, and 7 units are available. The listing shows every side of the engine and the fitted parts.
BMW E28 M5 S38B36 Engine 1992, 179,700 km — 6.761,00 €, reduced from 7.950,00 €. It comes from a 1992 donor car with 179,700 km, and 25 units are available. The listing shows every side of the engine and the fitted parts.
BMW E28 M5 S38B36 Engine 1990, 54,700 km — 7.018,00 €, reduced from 8.350,00 €. It comes from a 1990 donor car with 54,700 km, and 12 units are available. We can confirm fitment against your VIN the same day.
BMW E28 M5 S38B36 Engine 1991, 119,200 km — 8.676,00 €, reduced from 9.400,00 €. It comes from a 1991 donor car with 119,200 km, and 18 units are available. The listing shows every side of the engine and the fitted parts.
BMW E28 M5 S38B36 Engine 1990, 104,700 km — 8.851,00 €, reduced from 9.950,00 €. It comes from a 1990 donor car with 104,700 km, and 15 units are available. We can confirm fitment against your VIN the same day.
BMW E28 M5 S38B36 Engine 1992, 94,600 km — 9.136,00 €, reduced from 10.050,00 €. It comes from a 1992 donor car with 94,600 km, and 19 units are available. The listing shows every side of the engine and the fitted parts.
BMW E28 M5 S38B36 Engine 1992, 168,400 km — 7.304,00 €, reduced from 8.100,00 €. It comes from a 1992 donor car with 168,400 km, and 7 units are available. Ask the desk for compression figures or extra photographs before you order.
BMW E28 M5 S38B36 Engine 1991, 181,300 km — 6.154,00 €, reduced from 7.050,00 €. It comes from a 1991 donor car with 181,300 km, and 13 units are available. The listing shows every side of the engine and the fitted parts.
BMW E28 M5 S38B36 Engine 1992, 191,100 km — 6.508,00 €, reduced from 7.950,00 €. It comes from a 1992 donor car with 191,100 km, and 12 units are available. We can confirm fitment against your VIN the same day.
BMW E28 M5 S38B36 Engine 1990, 121,700 km — 7.697,00 €, reduced from 8.450,00 €. It comes from a 1990 donor car with 121,700 km, and 28 units are available. Ask the desk for compression figures or extra photographs before you order.
BMW E28 M5 S38B36 Engine 1988, 181,200 km — 8.490,00 €, reduced from 9.450,00 €. It comes from a 1988 donor car with 181,200 km, and 25 units are available. We can confirm fitment against your VIN the same day.
BMW E28 M5 S38B36 Engine 1989, 43,800 km — 8.822,00 €, reduced from 10.000,00 €. It comes from a 1989 donor car with 43,800 km, and 10 units are available. We can confirm fitment against your VIN the same day.
Buying checklist for a BMW E12 and E28 5 Series engine
- Confirm the exact engine code. Read the code stamped on the block and compare it with the code for your car. Send us the last seven characters of the VIN and we confirm the match before anything is paid.
- Ask how the donor car was damaged. Most good used engines come from cars with body damage. A front-end impact can crack sensors, the timing cover or the sump; a rear or side impact usually leaves the engine untouched. The yard records the damage on each unit.
- Compression or leak-down figures. Even compression across all cylinders tells you more than mileage. Ask for the figures, not just a pass or fail, and compare the highest and lowest readings: a spread above 10 to 15 percent deserves a question.
- Look at the oil and coolant. Clean oil without metal particles and coolant without oil are good signs. Milky oil, oily coolant or a burnt smell mean the engine needs further checks before it is fitted.
- Photographs from every side. Good suppliers photograph the actual engine you will receive. Look for the block stamp, the sump, the timing cover and any broken brackets or connectors in the pictures.
- List of what is fitted. Engines are sold with different ancillaries: some have the turbo, injectors, manifolds, alternator and starter, others are long blocks. Agree the list in writing so you know which parts must come from your old engine.
- Sump, oil pickup and drive variants. Rear-drive, xDrive and front-drive cars can use different sumps, oil pickups and engine mounts even with the same engine code. Check that the sump matches your subframe and front axle.
- Gearbox and flywheel match. Manual and automatic engines differ at the flywheel or flexplate, and sometimes at the crankshaft spigot. Make sure the engine you buy matches your gearbox or that you transfer the right parts.
- Warranty terms in writing. Read what the warranty covers, how long it runs and what fitting conditions apply. Most warranties require a qualified workshop, new fluids and filters, and replacement of the cooling parts that caused the original failure.
- Why your old engine failed. Before fitting a replacement, find out why the original failed. An overheating radiator, a blocked intercooler or a failed turbo can destroy a second engine if they are not fixed.
- 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.
- 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.
- 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.
- Timing belt history. A timing belt must be changed on time and distance. With no dated record, treat the belt, tensioner and water pump as due and replace them before the first start.
- 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.
- 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.
Fitting an engine to your BMW E12 and E28 5 Series
- Compare the engines side by side. Put the replacement next to the old engine and compare sensors, brackets, connectors, the sump, the starter and the flywheel or flexplate. Note anything that must be transferred.
- Transfer the parts that differ. Move the parts that are specific to your car, such as the engine harness on some models, the sump on xDrive cars or the air conditioning compressor bracket. Use new seals and gaskets for everything you move.
- Replace the rear main seal and drive parts. With the engine out, the rear crankshaft seal is easy to reach. Fit a new one, inspect the flywheel and clutch on manual cars or the converter seal on automatics.
- Renew the cooling system. Most engine failures start with cooling. Fit a new water pump, thermostat and hoses, check the radiator and fan, and use the correct coolant.
- Fit new engine mounts. Old mounts transfer vibration and can let the engine move enough to damage hoses. They are cheap and easy to replace with the engine out.
- Inspect or replace the timing chain parts. Look at the guides and tensioner. On high-mileage engines, replacing them now costs far less than doing it later.
- Fit a new timing belt kit. Fit a new belt, tensioner and water pump and set the timing with the correct tools before the first start.
- 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.
- 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.
- Clean the intake. If the old engine failed internally, debris can be in the intake or intercooler. Clean them so nothing reaches the new engine.
- Fill with the right oil and prime it. Fill with new oil of the correct specification and a new filter. Crank with the fuel and ignition disabled until oil pressure builds.
- Coding and adaptations. On modern BMWs, the engine ECU must be matched to the car's immobiliser (CAS, FEM or BDC). Reset adaptations, register the battery and clear faults with diagnostic software.
- First start and leak check. Start the engine, let it idle and watch oil pressure, temperature and fault codes. Check for leaks and bleed the cooling system.
- First 1,000 km. Drive gently for the first few hundred kilometres, vary the engine speed and avoid full load. Change the oil and filter after about 1,000 km to remove any assembly debris.
Diagnosing engine trouble in a BMW E12 and E28 5 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.
| Symptom | Likely cause |
|---|---|
| Knocking from the bottom of the engine | A deep knock that rises with engine speed usually means worn rod or main bearings. |
| Overheating or losing coolant | Coolant loss without visible leaks points to a head gasket or a cracked head; visible leaks point to the water pump, hoses, thermostat housing or expansion tank. |
| White smoke that smells sweet | Coolant burning in the cylinders, from a head gasket, a cracked head or, on diesels, a leaking EGR cooler. |
| Blue smoke | Oil burning in the cylinders. |
| Rough idle or misfire | Ignition coils, spark plugs, injectors and vacuum leaks are the usual causes. |
| Loss of power | Start with the simple things: air filter, boost leaks on turbo engines, fuel pressure and fault codes. |
| Rattle for a few seconds after a cold start | The classic sign of a weak timing chain tensioner or stretched chain. |
| Whistle, loss of boost or limp mode | A split charge pipe, a sticking wastegate or worn turbo bearings. |
| 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. |
| Engine stops suddenly and will not restart | On belt-driven engines, a snapped timing belt. |
| 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. |
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.
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.
Engine stops suddenly and will not restart. On belt-driven engines, a snapped timing belt. Do not keep cranking: on an interference engine the valves are probably already bent.
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 E12 and E28 5 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 E12 and E28 5 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.
Door-to-door delivery is included to the address you give at checkout. Typical delivery takes three to five working days within Germany and neighbouring countries and five to ten working days to the rest of Europe and the UK.
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 E12 and E28 5 Series engines from Hamburg to customers across Europe and beyond. Typical door-to-door times and customs status:
| Country | Typical delivery | Customs and VAT |
|---|---|---|
| Germany | 2–4 working days | No customs; German VAT on the invoice |
| Netherlands | 3–5 working days | EU delivery, no customs |
| Belgium | 3–5 working days | EU delivery, no customs |
| Austria | 3–5 working days | EU delivery, no customs |
| Denmark | 3–5 working days | EU delivery, no customs |
| Poland | 3–6 working days | EU delivery, no customs |
| Czech Republic | 3–6 working days | EU delivery, no customs |
| France | 4–7 working days | EU delivery, no customs |
| Italy | 5–8 working days | EU delivery, no customs |
| Spain | 5–8 working days | EU delivery, no customs |
| Portugal | 6–9 working days | EU delivery, no customs |
| Sweden | 5–8 working days | EU delivery, no customs |
| Norway | 6–10 working days | Export; import VAT and duty in Norway |
| Switzerland | 5–8 working days | Export; import VAT and duty in Switzerland |
| United Kingdom | 5–10 working days | Export; UK import VAT and duty on arrival |
| Ireland | 6–10 working days | EU delivery, no customs |
| United States | Quoted per order | Export; US import duties apply |
| United Arab Emirates | Quoted per order | Export; UAE import duties apply |
Times are typical for pallet delivery after dispatch and can vary with holidays and remote addresses. Business buyers in the EU with a valid VAT number can order without German VAT.
Questions about BMW E12 and E28 5 Series engines
Will the M20B25 engine fit my BMW E28 525i?
Yes, if your BMW E28 525i was built with the M20B25. BMW used this 2.5 liter (2,494 cc) petrol engine with 126 kW (171 HP) in the E28 525i from about 1985 to 1993.
In our records the M20B25 is the engine for the E28 525i, which makes the match simple. Still, check the code on your old engine or send us your VIN.
Also tell us if your E28 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 M20 Engines · Search M20B25 in the shop
How much is a replacement M20B25 engine for a BMW E28 525i?
A used M20B25 for the BMW E28 525i costs from about 1.300 € to 2.200 € in our yard. The price depends on the year, the mileage and the parts that come with the engine.
Shipping is a flat 249 € per order. It is added once at checkout and printed on the invoice, so there is no extra fee later. Inside the EU there is no import duty. Outside the EU, the receiver pays local duty and VAT.
A replacement engine is often much cheaper than rebuilding a damaged one, and much faster. The M20B25 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 M20 Engines · Search M20B25 in the shop
Will the M20B20 engine fit my BMW E28 520i?
Yes, if your BMW E28 520i was built with the M20B20. BMW used this 2.0 liter (1,991 cc) petrol engine with 95 kW (129 HP) in the E28 520i from about 1977 to 1992.
In our records the M20B20 is the engine for the E28 520i, which makes the match simple. Still, check the code on your old engine or send us your VIN.
Also tell us if your E28 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 M20 Engines · Search M20B20 in the shop
How much is a replacement M20B20 engine for a BMW E28 520i?
A used M20B20 for the BMW E28 520i costs from about 1.000 € to 1.700 € 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 M20B20 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 M20 Engines · Search M20B20 in the shop
Will the M30B35 engine fit my BMW E28 535i?
Yes, if your BMW E28 535i was built with the M30B35. BMW used this 3.5 liter (3,430 cc) petrol engine with 155 kW (211 HP) in the E28 535i from about 1982 to 1993.
In our records the M30B35 is the engine for the E28 535i, which makes the match simple. Still, check the code on your old engine or send us your VIN.
Also tell us if your E28 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 E28 535i?
A used M30B35 for the BMW E28 535i 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 E28 M5?
Yes, if your BMW E28 M5 was built with the M30B34. BMW used this 3.4 liter (3,430 cc) petrol engine with 160 kW (218 HP) in the E28 M5 from about 1985 to 1988.
Some E28 M5 cars were built with a different engine: the S38B36. These look alike from the outside, so check the code on your engine or send us your VIN.
Also tell us if your E28 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 E28 M5?
A used M30B34 for the BMW E28 M5 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 S38B36 engine fit my BMW E28 M5?
Yes, if your BMW E28 M5 was built with the S38B36. BMW used this 3.6 liter (3,535 cc) petrol engine with 232 kW (315 HP) in the E28 M5 from about 1988 to 1992.
Some E28 M5 cars were built with a different engine: the M30B34. These look alike from the outside, so check the code on your engine or send us your VIN.
Also tell us if your E28 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 S38 Engines · Search S38B36 in the shop
How much is a replacement S38B36 engine for a BMW E28 M5?
A used S38B36 for the BMW E28 M5 costs from about 6.000 € to 9.200 € 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 S38B36 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 S38 Engines · Search S38B36 in the shop
Questions about the engines in the BMW E12 and E28 5 Series
Will the M10B18 engine fit my BMW E30 318i?
Yes, if your BMW E30 318i was built with the M10B18. BMW used this 1.8 liter (1,766 cc) petrol engine with 77 kW (105 HP) in the E30 318i from about 1975 to 1988.
Some E30 318i cars were built with a different engine: the M40B18. These look alike from the outside, so check the code on your engine or send us your VIN.
Also tell us if your E30 has a manual or an automatic gearbox. The flywheel or the flex plate and some sensors depend on it.
Not sure? Send us your VIN and your gearbox code. We match the engine family, the year window and the parts on the engine before anything is reserved, and the check is free.
See all M10 Engines · Search M10B18 in the shop
Glossary
- Wastegate — A valve that lets exhaust gas bypass the turbine to control boost pressure. Worn wastegates rattle and can cause boost faults.
- 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.
- 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.
- Timing belt — A rubber belt that drives the camshaft. It must be replaced on time to avoid valve damage.
- TU — Technical Update, BMW's suffix for a revised version of an engine.
Our verdict
The BMW E12 and E28 5 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 E12 and E28 5 Series engine in stock, or ask the Hamburg desk to check your VIN.
