The BMW S65B40 engine is a V8 naturally aspirated engine with two overhead camshafts (DOHC), 32 valves, which replaced the S54 six-cylinder engine and has been in production since 2007. The BMW S65 is only available on the BMW M3 and has the same bore / stroke as the 10-cylinder S85, but unlike the S85, the VANOS system is driven by oil pressure. The replacement for this power unit was the 6-cylinder – S55.
|Cylinder block alloy||aluminum|
|Number of cylinders||8|
|Valves per cylinder||4|
|Piston stroke, mm||75.2|
|Cylinder bore, mm||92|
|Power output, hp||420 /8300 rpm|
|Torque output, Nm / rpm||400 /3900 rpm|
|Euro standards||Euro 4|
|Fuel consumption, L/100 km (for E90 M3)
|Oil consumption, gr/1000 km||up to 1000|
|Recommended engine oil||10W-60|
|Engine oil capacity, liter||8.8|
|Engine lifespan, km||~200 000|
— M DCT
|Gear ratios, 6MT||1 — 4.06
2 — 2.40
3 — 1.58
4 — 1.19
5 — 1.00
6 — 0.87
|Gear ratios, M DCT||1 — 4.78
2 — 2.93
3 — 2.15
4 — 1.68
5 — 1.39
6 — 1.20
7 — 1.00
Disadvantages of the S65B40 engine
During the operation of the power unit BMW S65 are faced with the problem of rapid wear of the connecting rod bearings – they must be changed every 80 thousand kilometers. To avoid serious damage, it is advisable to replace the liners in advance.
Periodic repairs are required for the Vanos system; for this, a repair kit is used. Running problems can lead to engine rattling.
The motor works without problems for a long time, subject to regular maintenance, no overheating, timely replacement of worn parts.