The BMW S85 engine, a V-type 10-cylinder piston engine with two overhead camshafts (DOHC) that took the place of the S62 engine, was manufactured between 2005 and 2010 and was utilized in the BMW E60 M5, E61 M5, and E63/64 M6. A red mark on the 8250 rpm rev counter indicates that the S85B50 engine is high-revving. It has a very high compression ratio of 12.0:1 and can produce more than 100 horsepower (70 kW) per liter. The BMW Williams F1 engine serves as the foundation for its technology.
Specifications
| Manufacturer | Dingolfing Plant |
| Also called | S85 |
| Production years | 2005-2010 |
| Cylinder block alloy | aluminum |
| Fuel system | injector |
| Configuration | V |
| Number of cylinders | 10 |
| Valves per cylinder | 4 |
| Piston stroke, mm | 75.2 |
| Cylinder bore, mm | 92 |
| Compression ratio | 12.0 |
| Displacement, cc | 4999 |
| Power output, hp | 507 /7750 rpm |
| Torque output, Nm / rpm | 520 /6200 rpm |
| Fuel type | petrol |
| Euro standards | Euro 4 |
| Weight, kg | 240 |
| Fuel consumption, L/100 km — city — highway — combined |
22.7 10.2 14.8 |
| Oil consumption, gr/1000 km | up to 1000 |
| Recommended engine oil | 10W-60 |
| Engine oil capacity, liter | 9.3 |
| Engine lifespan, km | ~200 000 |
| Transmission — 6MT — SMG III |
ZF Type-G Getrag 247 |
| Gear ratios, 6MT | 1 — 4.05 2 — 2.40 3 — 1.58 4 — 1.19 5 — 1.00 6 — 0.87 |
| Gear ratios, SMG III | 1 — 3.99 2 — 2.65 3 — 1.81 4 — 1.39 5 — 1.16 6 — 1.00 7 — 0.83 |
Disadvantages of the S85B50 engine
The connecting rod bearings on the BMW S85 engine are prone to premature wear. Every 80,000 kilometers, a replacement must be made. In this situation, it is preferable to replace the liners ahead of time rather than waiting for total wear and tear to avoid breakdowns, which will cost a lot of money to fix.
The Vanos system needs to be repaired on a regular basis; issues are rare but must be resolved quickly. It is important to prevent the motor from overheating.
The BMW S85’s powertrain will have a long and trouble-free lifespan with routine maintenance and diagnostics.