BMW S85 Engine – V-type 10-cylinder piston engine with two overhead camshafts (DOHC), which replaced the S62 engine, was produced from 2005 to 2010 and was used in BMW E60 M5, E61 M5 and E63/64 M6. The S85B50 engine is high-revving, with a red mark on the 8250 rpm rev counter. It reaches over 100 hp (70 kW) per liter, and has a very high compression ratio of 12.0:1. Its technology is based on the BMW Williams F1 engine.
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 BMW S85 engine is characterized by premature wear on the connecting rod bearings. Replacement must be done every 80 thousand kilometers. In this case, it is better to change the liners in advance, without waiting for complete wear and tear, in order to prevent breakdowns, the elimination of which will require significant investments.
Periodic repairs are necessary for the Vanos system, problems occur infrequently, but require timely elimination. Overheating of the motor should be avoided.
With regular diagnostics and maintenance, the powertrain of the BMW S85 will last a long time and without any problems.
