BMW M6 E63/E64 Engines — The Complete UK Guide

Affected models:

M6 E63/E64 all variants (2005–2010) with S85B50 engine.

Typical failure mileage:

30,000–80,000 miles.

Root cause:

The S85's rod bearings are the defining weakness of this otherwise magnificent engine. Premature bearing wear is well‑documented and can lead to catastrophic bottom‑end failure if not addressed. The issue is exacerbated by the engine's high‑revving nature and the tight bearing clearances from the factory.

Affected models:

M6 E63/E64 all variants (2005–2010) with S85B50 engine.

Typical failure mileage:

40,000–80,000 miles.

Root cause:

The S85 uses electronic throttle actuators to control the 10 individual throttle bodies. These actuators are a common failure point, leading to reduced power, engine warning lights, and in some cases, limp mode.

Affected models:

M6 E63/E64 all variants (2005–2010) with S85B50 engine.

Typical failure mileage:

50,000–100,000 miles.

Root cause:

The S85's VANOS system can wear over time, leading to reduced low‑end torque, rough idle, and rattling on start‑up. This is a shared issue with other BMW V8 and V10 engines.

Affected models:

M6 E63/E64 with 7‑speed SMG III (2005–2010).

Typical failure mileage:

40,000–80,000 miles.

Root cause:

The 7‑speed SMG III automated manual is a sophisticated gearbox, but it can suffer from hydraulic pump failure, clutch wear, and mechatronics issues -particularly on high‑mileage or tracked cars.

Affected models:

M6 E63/E64 all variants (2005–2010) with S85B50 engine.

Typical failure mileage:

30,000+ miles.

Root cause:

The S85 is known for moderate oil consumption -typically 1 litre per 1,000–2,000 miles, which BMW considers normal. However, excessive consumption can indicate valve stem seal wear or piston ring wear.