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.
Specifications
| Manufacturer | Munich Plant |
| Also called | S65 |
| Production years | 2007-2013 |
| Cylinder block alloy | aluminum |
| Fuel system | injector |
| Configuration | V |
| Number of cylinders | 8 |
| Valves per cylinder | 4 |
| Piston stroke, mm | 75.2 |
| Cylinder bore, mm | 92 |
| Compression ratio | 12.0 |
| Displacement, cc | 3999 |
| Power output, hp | 420 /8300 rpm |
| Torque output, Nm / rpm | 400 /3900 rpm |
| Fuel type | petrol |
| Euro standards | Euro 4 |
| Weight, kg | 202 |
| Fuel consumption, L/100 km (for E90 M3) — city — highway — combined |
17.0 9.0 11.9 |
| Oil consumption, gr/1000 km | up to 1000 |
| Recommended engine oil | 10W-60 |
| Engine oil capacity, liter | 8.8 |
| Engine lifespan, km | ~200 000 |
| Transmission — 6MT — M DCT |
ZF Type-G Getrag GS7D36SG |
| 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.
