2005 — 2010
5.0L (S85B50) V10 - High-performance naturally aspirated M-engine
Petrol
Check this by performing a cold start while listening closely to the engine bay. | Description: Listen for any irregular ticking or knocking sounds that could indicate worn rod bearings; the S85 engine is known to benefit from preventative monitoring of these bearings as the odometer climbs.
While driving at low speeds in manual mode, pay attention to the SMG transmission gear shifts. | Description: Assess if the shifts feel reasonably crisp; any excessive hesitation or 'clunking' could suggest that the SMG hydraulic pump or clutch release bearing may require professional inspection in the future.
During your test drive, observe the iDrive screen and infotainment operation. | Description: Ensure the screen remains stable and responsive, as the CCC modules in these era BMWs can occasionally develop software glitches or display failure, which is worth noting for your long-term ownership plan.
Check this by performing a few firm stops in a safe area to test the brake feel. | Description: The M6 is a heavy, high-performance machine, so verify that the pedal is firm and lacks any pulsation, as the rotors and pads are significant wear items for a car of this caliber.
Consider a comprehensive inspection of the SMG fluid and clutch wear percentage via a diagnostic tool.
A common point to review the condition of the throttle actuator gears and potential rod bearing health.
Recommend a full cooling system refresh including the water pump and thermostat to ensure optimal thermal management for the V10.
Prioritise regular engine oil changes using the manufacturer-specified high-grade synthetic oil to keep the V10 internals happy.
Keep a close eye on your oil consumption, as these high-performance engines often prefer to be kept topped up between services.
Periodically inspect the condition of the suspension bushings and control arms, as the weight of the car can lead to natural wear over time.
Check the battery health regularly, as the complex electronics in the M6 require a steady voltage to function without throwing false warnings.
Ensure the Vanos high-pressure lines and solenoids are checked during your major service intervals to maintain that signature M-power delivery.
Estimated repair costs if issues arise
Given the high-revving nature of the S85 V10, some owners choose to replace these as a piece-of-mind measure. It is a specialised job involving the dropping of the subframe and sump.
If the transmission begins to show symptoms of slow engagement, it is wise to budget for a potential hydraulic pump refresh or clutch disc replacement to keep the drivetrain feeling sharp.
These units manage the individual throttle bodies for each cylinder. If you notice a 'limp mode' or power reduction, these actuators may eventually need to be refurbished or replaced.
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Disclaimer: This report is generated with the assistance of AI analysis based on verified automotive data. While we strive for 100% accuracy, enthusiasts should always conduct physical inspections and consult service records. View Full Disclaimer