The 2008 BMW M6 is an engineering masterpiece, distinguished by its unique 5.0-liter V10 engine code S85 B50A 1. This naturally aspirated powerplant is renowned for its high-revving character and precision engineering, requiring lubricants that can withstand extreme thermal loads and high rotational speeds. Selecting the correct fluids is not merely a maintenance task; it is a critical component of preserving the vehicle’s performance and longevity. Standard oils often fail to provide the necessary film strength and thermal stability required by the S85 engine, potentially leading to accelerated wear or reduced power output.
Recommended AMSOIL Products
- AMSOIL 10W-60 FS 100% Synthetic European Motor Oil – The premier choice for this high-performance V10, this oil features a European formula with a precise blend of synthetic base oils and premium additives designed specifically for the thermal demands of the 2008 BMW M6. It provides superior protection in extreme temperatures and extends the service interval significantly.
- MANN-FILTERS Oil Filter – Designed to work in tandem with AMSOIL oil, this filter offers premium media that improves filtration efficiency over original equipment manufacturer standards. It ensures that critical contaminants are removed from the high-flow S85 engine oil to maintain peak performance.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A unique poly-organic acid (OAT) formulation that provides robust protection for the entire cooling system. This pre-mixed solution protects all cooling system metals, gaskets, and hoses for up to 150,000 miles or 5 years, ensuring the V10 stays within optimal operating temperatures.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – For those preferring a concentrated solution, this product offers enhanced protection up to 150,000 miles or 5 years. It requires mixing with distilled water and vastly surpasses standards for metallic corrosion and erosion, safeguarding the aluminum engine block.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – This fluid provides excellent ABS and traction-control responsiveness with a stable viscosity over a wide temperature range. It is ideal for the high-performance braking systems found on the M6, ensuring consistent pedal feel during spirited driving.
- AMSOIL SEVERE GEAR® 75W-140 100% Synthetic Gear Lube – Recommended for the rear limited-slip differential, this heavy-duty lubricant contains friction modifiers specifically formulated for limited-slip applications. It helps control thermal runaway and reduces operating temperatures in the diff, extending the life of the gears.
- AMSOIL SEVERE GEAR® 75W-90 100% Synthetic Gear Lube – An excellent alternative for the rear standard differential, this lube offers advanced protection against wear and rust. It helps reduce operating temperatures and ensures long oil and seal life under the torque loads of the V10 drivetrain.
- AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid – This fluid resists heat for a long fluid life and helps seals remain soft to prevent leaks. It offers strong anti-wear protection and excellent high-temperature performance, ensuring quiet operation of the steering system.
- AMSOIL Signature Series Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – Withstands the rigors of high-performance driving, heavy towing, and elevated temperatures. This fluid remains fluid in sub-zero conditions and provides reserve protection during heavy use, ensuring smooth, shudder-free shifts.
- AMSOIL OE Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – An excellent option that protects against wear, resists harmful sludge, and guards against leaks. It promotes smooth, shudder-free shifts and offers outstanding cold-weather performance for the BMW transmission.
Proper maintenance of the 2008 BMW M6 extends far beyond just the engine oil. The cooling system, for instance, requires a specific volume of fluid to manage the heat generated by the S85 engine. The capacity for the cooling system is 15.9 quarts, necessitating a substantial amount of high-quality AMSOIL Passenger Car & Light Truck Antifreeze & Coolant. Whether you choose the pre-mixed AMSOIL Passenger Car & Light Truck Antifreeze & Coolant or the concentrated AMSOIL Propylene Glycol Antifreeze and Engine Coolant, maintaining the correct ratio and volume is essential. The cooling system is under constant stress, and the glycol-based formulas prevent corrosion on aluminum components and protect gaskets from degradation, which is vital for preventing costly overheating issues common in high-mileage vehicles.
The differential and power steering systems also demand attention. The rear differential, whether equipped with a limited-slip mechanism or a standard setup, requires a specific capacity of lubricant—2.3 pints for the rear unit. Using a synthetic AMSOIL SEVERE GEAR® 75W-140 100% Synthetic Gear Lube for limited-slip applications ensures that the friction modifiers are present to prevent chattering and wear. For the standard differential, the AMSOIL SEVERE GEAR® 75W-90 100% Synthetic Gear Lube variant provides the necessary viscosity and protection against rust and corrosion. These synthetic fluids are engineered to control thermal runaway, a critical factor given the heat generated by the rear axle during aggressive driving. Similarly, the power steering system benefits from a fluid that resists heat breakdown, such as AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid, ensuring the seals stay soft and operation remains quiet and responsive.
About the Vehicle
The 2008 BMW M6 represents the pinnacle of the E63/E64 generation, combining the luxurious grand touring capabilities of the 6 Series with the raw performance of the M division. At the heart of this machine lies the S85 V10 engine, a rarity in the automotive world that is widely celebrated by enthusiasts. This naturally aspirated 5.0-liter unit was the first road-going V10 from BMW and was developed in-house by BMW Motorsport. It is known for its distinctive, high-pitched exhaust note and its ability to rev freely to an 8,200 RPM redline. The engine produces approximately 500 horsepower, delivering power with a linear, throttle-controlled feel that is characteristic of naturally aspirated engines.
Externally, the M6 is a two-door coupe that commands attention with its aggressive styling cues, including a widened front fascia, sculpted wheel arches, and the signature kidney grille. The chassis was heavily reinforced to handle the torque of the V10, featuring an aluminum strut front suspension and a multi-link rear suspension. The car was designed for both high-speed stability on the Autobahn and agility on the track, offering a driving dynamic that is both refined and exhilarating. Owners of the 2008 M6 often describe it as a car that bridges the gap between a comfortable daily driver and a dedicated supercar, offering a level of performance that was unmatched in its class at the time of its release.
Maintaining this vehicle requires a deep understanding of its specific needs. The S85 engine, while reliable, is sensitive to oil quality and cooling efficiency due to its high operating temperatures. The use of AMSOIL synthetic lubricants ensures that the engine, transmission, and differential receive the protection necessary to handle the extreme conditions imposed by this high-performance powertrain. From the initial oil change to the final AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid flush, using the correct fluids is the key to preserving the value and performance of this exceptional machine for years to come.
For owners looking to optimize the vehicle’s condition, additional products such as fuel additives can play a supportive role. The AMSOIL P.i.® Performance Improver Gasoline Additive is designed to clean carbon deposits from injectors and restore lost horsepower, which can be particularly beneficial for engines that see regular spirited driving. Similarly, during seasonal storage, using an AMSOIL Engine Fogging Oil or a fuel stabilizer can prevent internal corrosion and fuel degradation, ensuring the car is ready to fire up whenever the weather turns favorable. The comprehensive range of AMSOIL fluids covers every aspect of the vehicle’s lubrication system, providing peace of mind for those who demand the best for their BMW.
In conclusion, the 2008 BMW M6 is a vehicle that rewards careful and knowledgeable ownership. By adhering to the specific lubrication requirements and utilizing premium synthetic products, owners can mitigate the risks associated with high-performance engines and maintain the car’s exceptional character. Whether you are driving on the open road or pushing the vehicle to its limits on the track, the right fluids ensure that the M6 performs as intended, delivering the precision, power, and reliability that make it a legend in the automotive world.