The 2008 Mercedes-Benz S65 AMG is a pinnacle of engineering, powered by a legendary 6.0L V12 biturbo engine. This powerhouse delivers immense performance, but such sophisticated machinery demands equally sophisticated lubrication. Regular maintenance with the correct fluids is not just about meeting service intervals; it is about ensuring that the twin-turbo system runs cool, the high-compression internals are protected from wear, and all mechanical systems operate with minimal friction. Using premium AMSOIL synthetic lubricants helps safeguard this investment against the extreme thermal and mechanical stresses associated with high-performance driving.
Recommended AMSOIL Products
- AMSOIL 5W-40 FS 100% Synthetic European Motor Oil – Specifically engineered for the unique demands of European vehicles, this oil provides superior protection for the 6.0L twin-turbo V12 and maintains performance across a wide temperature range.
- AMSOIL 0W-40 FS 100% Synthetic European Motor Oil – An excellent alternative for extreme cold weather starting, offering the same high-level protection and fluidity required for this high-output engine.
- AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Designed to withstand the rigors of heavy towing and elevated temperatures, ensuring smooth shifts and long transmission life.
- AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – A high-performance alternative that protects against wear and maintains optimal viscosity for the 5-speed automatic transmission.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Meets Mercedes-Benz specifications with excellent ABS and traction-control responsiveness, providing stable viscosity over a wide temperature range.
- AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid – Reduces friction and helps seals remain soft to prevent leaks, offering excellent protection for the hydraulic power steering system.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A pre-mixed formulation that protects all cooling system metals and hoses while meeting OEM requirements for this high-heat engine.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated AMSOIL coolant option that offers extended protection against corrosion and erosion, ideal for owners who prefer to mix their own solutions.
When performing maintenance on the S65 AMG, it is vital to note the specific fluid capacities to ensure proper system operation. The 6.0L V12 engine requires a substantial amount of oil due to its size and the twin-turbo configuration. With the AMSOIL oil filter changed, the engine requires 9.5 quarts of motor oil. It is crucial to allow five minutes after refilling or turning the engine off before checking the oil level, as the oil needs time to drain back into the sump. On models equipped with an external oil cooler, additional oil may be necessary if the cooler is drained during the service, so always verify the level carefully after the initial fill. The oil drain plug should be torqued to 22 ft/lbs to ensure a secure seal without risking damage to the aluminum pan.
The cooling system is equally critical for a vehicle of this caliber. The 2008 S65 AMG holds 14.7 quarts of AMSOIL Propylene Glycol Antifreeze and Engine Coolant. Whether you choose the pre-mixed AMSOIL Passenger Car & Light Truck Antifreeze & Coolant or the concentrated propylene glycol version, ensuring the system is filled to the correct capacity prevents overheating, which can be a significant risk for a high-performance twin-turbo engine under load. The synthetic coolants recommended here are phosphate, nitrate, and silicate-free, providing the necessary protection for the various metals and rubber hoses found in the Mercedes cooling loop without causing degradation over time.
Transmission health is paramount for the smooth delivery of the S65’s massive torque. The vehicle utilizes a 5-speed automatic transmission (722.6 series). A complete fill for this system requires 8.5 quarts, while an initial fill capacity stands at 6.9 quarts. Using a high-quality synthetic transmission fluid like the AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid is essential to maintain the precise hydraulic pressures required for smooth shifting and to protect the complex internal gears and clutches from wear. The AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid is another option formulated to remain fluid even in sub-zero temperatures while resisting thermal breakdown during spirited driving or track use.
Vehicle Background
The 2008 Mercedes-Benz S65 AMG represents the apex of the W220 generation’s evolution, marking a time when the S-Class was redefining the concept of a luxury performance sedan. Powered by the M275 engine, a hand-built 6.0-liter V12 bi-turbo, this vehicle delivered approximately 604 horsepower and 738 lb-ft of torque. This massive displacement, combined with the twin-scroll turbochargers, allowed the heavy luxury sedan to accelerate with the punch of a much smaller sports car, a characteristic that made the S65 AMG a favorite among enthusiasts and collectors alike.
Produced at the Mercedes-Benz Sindelfingen plant in Germany, the S65 AMG was distinct from standard S-Class models in both its exterior styling and internal mechanics. The AMG-specific front fascia, larger alloy wheels, and dual-exhaust system gave the car an aggressive stance, while the interior offered a blend of bespoke luxury and driver-focused controls. The “AMG” badge on the trunk signaled a vehicle that had been vetted for high-performance durability, yet it retained the plush ride quality and quiet cabin refinement expected of the S-Class line. Owning an S65 AMG was not just about having a comfortable long-distance cruiser; it was about possessing a machine capable of incredible acceleration and dynamic handling, setting a standard for what a performance luxury sedan could achieve in the late 2000s.
Seasonal and Additional Maintenance
For owners who store their S65 AMG during off-seasons or periods of inactivity, proper preparation is key to preventing engine corrosion and fuel degradation. The AMSOIL Gasoline Stabilizer is an excellent choice for protecting the fuel system, keeping fuel fresh for up to 12 months and fighting ethanol corrosion. This ensures that when the engine is started again, the injectors and combustion chambers are clear of gum and varnish buildup. Additionally, the AMSOIL Engine Fogging Oil provides a rust preventive coating on internal components, offering peace of mind during long storage periods.
Regular cleaning and protection also play a role in preserving the vehicle’s condition. The AMSOIL Power Foam® Carburetor and Induction-System Cleaner can be used to maximize horsepower by removing deposits from the intake system, while the AMSOIL Engine Degreaser helps maintain a clean engine bay, making inspections easier and preventing grime buildup. For the exterior, the AMSOIL Miracle Wash offers a waterless cleaning option that repels dust and dirt, while the AMSOIL Exterior Ceramic Spray provides a durable, shiny finish that sheds water and protects against UV rays. These care products help maintain the pristine appearance of the S65 AMG, ensuring it looks as impressive as it drives.