What are the most common BMW M6 problems?
According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2008 BMW M6 has 6 documented issues. The most frequently reported are: S85 V10 Rod Bearing Failure (Catastrophic Engine Destruction), S85 V10 VANOS High-Pressure Oil Pump Failure, SMG Hydraulic Pump and Clutch Actuator Failure. Of these, 4 are rated critical and should be addressed promptly.
Is the BMW M6 reliable?
The 2008 BMW M6 has 6 known issues compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. 4 issues are rated critical: S85 V10 Rod Bearing Failure (Catastrophic Engine Destruction) and S85 V10 VANOS High-Pressure Oil Pump Failure and SMG Hydraulic Pump and Clutch Actuator Failure and Rod Bearing Premature Wear (S65/S63 Engines). Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.
How much does it cost to fix common BMW M6 problems?
Repair costs for known BMW M6 issues range from $300 to $32,000, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, S85 V10 Rod Bearing Failure (Catastrophic Engine Destruction), typically costs $6,500-$32,000 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
What is the 2006-2010 BMW M6 S85 V10 Rod Bearing Failure (Catastrophic Engine Destruction)?
The S85 5.0L V10 engine in the E63 M6 (2006-2010) has catastrophically tight rod bearing clearances (0.001" vs 0.0025" industry standard) with thin OEM bearings that fail prematurely, leading to spun bearings and complete engine destruction. This is the single most critical issue… Repairs typically run $6,500-$32,000. Severity: high.
What is the 2005-2010 BMW M6 S85 V10 VANOS High-Pressure Oil Pump Failure?
On the S85 5.0L V10 (E63/E64 M6), the VANOS variable-valve-timing system runs off a dedicated high-pressure oil pump mounted in the oil pan that must produce roughly 1,000 psi. Over time the pump's internal seals wear and the high-pressure VANOS lines can split, causing pressure… Repairs typically run $1,800-$5,500. Severity: high.
What is the 2005-2010 BMW M6 SMG Hydraulic Pump and Clutch Actuator Failure?
The E63/E64 M6 uses a Sequential Manual Gearbox (SMG III) that relies on a hydraulic pump and actuator to operate the clutch. The SMG pump is prone to failure, typically between 60,000 and 90,000 miles. When the pump fails, the car displays "SMG Transmission Fault" and may become… Repairs typically run $2,000-$4,000. Severity: high.
What is the 2005-2019 BMW M6 Rod Bearing Premature Wear (S65/S63 Engines)?
Both the S65 V8 (E63 M6) and S63 twin-turbo V8 (F06/F12/F13 M6) suffer from premature rod bearing wear. The S65 is particularly notorious — the OEM rod bearings use a copper-lead composition that wears rapidly, especially with frequent cold starts and short trips. The S63 has imp… Repairs typically run $3,000-$6,000. Severity: high.
What is the 2005-2010 BMW M6 E63/E64 Active Steering and Steering-Gear Play / Knock?
On the E63/E64 6 Series and M6, owners report knocking and developing play from the steering gear (Lenkgetriebe), often associated with the Active Steering setup. German forums (motor-talk.de) describe a clacking/knocking noise and light play in the steering, with replacement ste… Repairs typically run $300-$3,500. Severity: medium.
What is the 2006-2010 BMW M6 S85 V10 Throttle Actuator Failure (Plastic Gear Stripping)?
The S85 V10 engine in the E63 M6 (2006-2010) uses individual throttle bodies with internal throttle actuators containing plastic PPA (polyphthalamide) gears that strip over time, typically around 70,000 miles. The plastic gear teeth are gradually worn down by the metal worm drive… Repairs typically run $500-$4,500. Severity: medium.
