The 2009 BMW M6 is a masterpiece of engineering, powered by the legendary S85 5.0L V10 engine. This high-revving powerhouse demands the absolute highest level of protection to maintain its performance characteristics and longevity. Owners who prioritize precision maintenance know that using the correct synthetic lubricants is not merely a suggestion but a requirement for this complex drivetrain. Proper fluids ensure that the engine, transmission, and differential systems operate smoothly under the extreme thermal and mechanical stresses associated with high-performance driving.
Recommended AMSOIL Products
- AMSOIL 10W-60 FS 100% Synthetic European Motor Oil – Specifically formulated for high-performance European vehicles with a 10W-60 viscosity, this oil provides precise protection for the S85 V10 engine. The recommended capacity is 10.4 quarts when replacing the filter.
- MANN-FILTERS Oil Filter – This premium filtration media offers significant improvements over standard original equipment manufacturer filters, ensuring maximum flow and contaminant capture for your M6.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A unique poly-organic acid formulation that provides protection up to 150,000 miles or 5 years. It is a 50/50 pre-mix ethylene glycol formula compatible with all cooling system metals and hoses, with a system capacity of 15.9 quarts.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated formula designed for high-mileage protection up to 150,000 miles, offering exceptional corrosion and erosion control for the cooling system.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Recommended for the brake hydraulic system to ensure excellent ABS responsiveness and stable viscosity across a wide temperature range, a critical requirement for a high-performance vehicle.
- AMSOIL SEVERE GEAR® 75W-140 100% Synthetic Gear Lube – An ideal choice for the rear limited-slip differential (GLS23) to control thermal runaway, reduce operating temperatures, and provide friction modifiers for the limited-slip application. The capacity is 2.3 pints.
- AMSOIL SEVERE GEAR® 75W-90 100% Synthetic Gear Lube – Recommended for the rear standard differential (GLS24) to offer advanced wear protection and rust inhibition, with a capacity of 2.3 pints.
- AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid – Reduces friction and helps seals remain soft to prevent leaks, providing strong anti-wear protection for the power steering system.
- AMSOIL Signature Series Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – Engineered to withstand the rigors of heavy use, elevated temperatures, and challenging terrain, remaining fluid in sub-zero conditions to promote smooth, shudder-free shifts.
- AMSOIL OE Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – A cost-effective alternative that guards against leaks and promotes smooth shifting while protecting against wear and harmful sludge.
Ensuring that your 2009 BMW M6 receives the correct lubricants is essential for preserving the vehicle’s integrity. The S85 engine is one of the most sophisticated naturally aspirated V10s ever put into a production car. It features a dual VANOS system that adjusts intake and exhaust cam timing, along with a sophisticated valve train. To keep this system lubricated and cool, the AMSOIL 10W-60 FS offers superior thermal stability and film strength. Unlike conventional oils that break down under the high heat generated by the V10, this synthetic fluid maintains its viscosity and protective properties even during track use or spirited driving on winding roads. The specified 10.4-quart capacity ensures that every bearing and camshaft in the engine receives a consistent flow of fresh lubricant, reducing friction and minimizing wear on critical components.
Transmission and Differential Protection
The transmission and differential systems in the M6 are just as critical as the engine itself. The vehicle utilizes a high-torque transmission that handles the immense power output of the 5.0L engine. Using AMSOIL Signature Series or OE Multi-Vehicle Automatic Transmission Fluid ensures that the transmission shifts smoothly and remains protected against the heat generated during aggressive acceleration. These fluids are designed to resist thermal breakdown, which is a common issue in high-performance automatic transmissions.
Similarly, the rear differential requires specific attention depending on the configuration. If your M6 is equipped with a limited-slip differential (GLS23), the AMSOIL SEVERE GEAR® 75W-140 100% Synthetic Gear Lube is the recommended lubricant. Its formulation includes friction modifiers essential for limited-slip clutches, preventing shudder while providing exceptional boundary lubrication. For the standard differential (GLS24), the SEVERE GEAR® 75W-90 grade offers a robust protective barrier against wear and corrosion. Both grades are 100% synthetic, ensuring low-temperature flow for quick protection upon startup and high-temperature stability to prevent the fluid from thinning out under stress.
Fluids for Seasonal and Heavy-Duty Conditions
Beyond the engine and drivetrain, other fluid systems in the M6 benefit from AMSOIL’s advanced chemistry. The cooling system capacity is 15.9 quarts, making the choice of antifreeze vital. AMSOIL Passenger Car & Light Truck Antifreeze & Coolant provides a phosphate-, nitrate-, nitrite-, silicate-, borate-, and amine-free formula that protects all metals and rubber components in the cooling system. For owners who store their vehicles or drive in extreme climates, the AMSOIL Propylene Glycol Antifreeze offers a concentrated option that greatly surpasses industry standards for corrosion and erosion protection.
AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid is another critical safety component. The M6’s braking system requires a high-temperature fluid that resists boiling. This fluid provides excellent ABS and traction-control responsiveness, maintaining a stable viscosity over a wide temperature range. This stability ensures that pedal feel remains consistent even after repeated hard stops. Additionally, the power steering system utilizes the AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid, which helps seals remain soft and prevents leaks while offering strong anti-wear protection for the steering pump and rack.
Maintenance and Long-Term Ownership
Proper maintenance intervals and fluid changes are the keys to a long life for the 2009 BMW M6. By adhering to the recommended fluid specifications and capacities, owners can avoid costly repairs associated with overheating, sludge buildup, or transmission failure. The AMSOIL product line for this vehicle covers every aspect of the lubrication system, from the initial fill to the final inspection. Whether you are performing a DIY service or have a professional handle the work, using these high-performance synthetic lubricants ensures that your M6 continues to deliver the driving dynamics it was designed for. Regular fluid changes with these products help maintain the vehicle’s value and performance, allowing the S85 engine to reach high RPMs without worry.
Model History and Performance
The 2009 BMW M6 represents a pinnacle of automotive engineering from the E63/E64 generation. It serves as the two-door coupe and convertible (E64) variant of the 6 Series, but it is distinct from the standard 6 Series models due to its exclusive M badging and high-performance components. Under the hood lies the naturally aspirated S85 V10 engine, a direct descendant of the technology used in the BMW F1 racing cars of the early 2000s. This 5.0-liter engine was unique in its ability to rev to 8,250 rpm, a characteristic that made it one of the most exciting engines in automotive history.
Owners of the 2009 M6 appreciate its raw driving character, which combines the luxury of a grand tourer with the aggression of a dedicated sports car. The vehicle’s design, led by Adrian van Hooydonk, features the iconic “kidney grille” that is larger and more aggressive than its non-M counterparts, along with wider fenders and a muscular stance. The interior is focused on the driver, with sport seats, an aluminum-finished interior, and a distinct M-branded steering wheel. The M6 is not just a luxury coupe; it is a high-performance machine that rivals many dedicated supercars of its era in terms of handling and power delivery.
Produced at the BMW plant in Spartanburg, South Carolina, the M6 was a halo vehicle for the brand during this period. Its market position was unique, as it bridged the gap between a comfortable daily driver and a track-capable sports car. The dual-clutch transmission options (or manual in earlier years, though the 2009 model typically featured the SMG) allowed for lightning-fast shifts that matched the engine’s power output. The 2009 model year specifically benefits from the continued refinement of the S85 engine, known for its smooth power delivery and distinctive sound. While the S85 engine has become a subject of enthusiast reverence due to the rise of turbocharging, the naturally aspirated V10 in the 2009 M6 remains a beloved symbol of BMW’s commitment to driving purity. This legacy makes the maintenance of the vehicle a passion for many, ensuring that these high-performance machines continue to perform as they were intended for years to come.