Maintaining the performance of your 2008 Mercedes-Benz S63 AMG requires more than just following a standard maintenance schedule; it demands fluids engineered specifically for the unique demands of its high-performance 6.3L DOHC V8 engine. This vehicle represents the pinnacle of AMG engineering, featuring an engine code that requires precise lubrication to handle extreme thermal loads and high RPMs. Using the wrong viscosity or a lower-quality fluid can compromise the engine’s longevity and the driving dynamics that S63 owners expect. The 6.3-liter naturally aspirated V8, known for its distinct sound and power delivery, places significant stress on oil, coolant, and transmission fluids, necessitating top-tier synthetic protection.
Recommended AMSOIL Products
- AMSOIL 5W-40 FS 100% Synthetic European Motor Oil – Specifically designed for the unique demands of European gasoline and hybrid vehicles, this oil offers a precise blend of synthetic base oils and premium additives to protect the high-stress engine.
- AMSOIL 0W-40 FS 100% Synthetic European Motor Oil – An excellent alternative viscosity that provides superior flow in extreme cold while maintaining a robust protective film at high operating temperatures for this 6.3L V8.
- AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Designed to withstand the rigors of heavy use and elevated temperatures, this fluid remains fluid in sub-zero conditions and provides reserve protection for the 7-speed transmission.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A unique poly-organic acid formulation that exceeds OEM requirements, protecting cooling system metals, gaskets, and hoses for up to 150,000 miles or 5 years.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated option that greatly surpasses standards for metallic corrosion and erosion, allowing for mixing with distilled water to achieve a wide range of performance levels.
- AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Provides essential protection against wear for automatic transmissions, ensuring smooth operation and extended service life.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Delivers excellent ABS and traction-control responsiveness with a stable viscosity over a wide temperature range, meeting the stringent requirements of Mercedes-Benz braking systems.
- AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid – Reduces friction and helps seals remain soft to prevent leaks while resisting heat for long fluid life and providing strong anti-wear protection.
The engine oil capacity for the 2008 Mercedes-Benz S63 AMG with the 6.3L 8-cylinder DOHC E engine is 9.3 quarts when a filter is included. It is important to note that on models equipped with an oil cooler, additional oil may be needed if the cooler is drained during service. Proper installation involves a torque specification of 22 ft/lbs for the oil drain plug. After refilling the oil, allow the engine to sit for five minutes or turn it off before checking the oil level to ensure an accurate reading and prevent overfilling. This specific engine configuration benefits significantly from the European formula of AMSOIL oils, which are calibrated for the tight tolerances and high-temperature environments found in AMG powertrains.
Moving beyond the engine, the cooling system for this vehicle requires a robust antifreeze solution. The cooling system capacity for this S63 is 11.8 quarts. The cooling system is critical not just for temperature regulation but for preserving the integrity of the cooling system metals, gaskets, and hoses. AMSOIL offers both a 50/50 pre-mix formulation that is ready to use and a concentrated propylene glycol option that can be mixed with distilled water to achieve precise cooling properties. Both formulations are phosphate-, nitrate-, nitrite-, silicate-, borate-, and amine-free, ensuring compatibility with the vehicle’s cooling system materials and extending the lifespan of the antifreeze. The protection provided by these coolants allows for service intervals of up to 150,000 miles or five years, whichever comes first, reducing maintenance frequency while maintaining peak thermal performance.
The transmission system in the S63, typically a 7-speed automatic, operates under significant stress. The fluid capacity for a total fill of the 722.9 transmission is 9.3 quarts. Whether the vehicle has the A89 Reduced-Friction code on the datacard or not, maintaining fluid integrity is vital for shift quality and transmission longevity. AMSOIL offers two primary transmission fluid options for this application. The Signature Series Fuel-Efficient fluid is designed to withstand heavy towing, elevated temperatures, and challenging terrain while remaining fluid in sub-zero conditions. The OE Fuel-Efficient fluid also provides robust protection against wear and is an excellent choice for maintaining the factory shift characteristics while offering superior protection against the heat and shear forces generated during spirited driving. Both fluids are 100% synthetic, offering a level of performance that standard mineral-based fluids cannot match.
Essential Fluids for Braking and Steering
The braking system on a vehicle of this caliber must perform flawlessly under extreme conditions. The 2008 S63 AMG requires brake fluid that meets MB Sheet 331.0 standards, specifically DOT 4 Plus. AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid is an ideal replacement, offering a stable viscosity over a wide temperature range. This ensures excellent responsiveness from the ABS and traction-control systems, providing the driver with the confidence to push the vehicle to its limits. The synthetic nature of the fluid prevents moisture absorption and boiling, which are common failure points in high-performance braking systems.
Similarly, the power steering system benefits from high-quality lubrication. The recommended fluid for the PS031 system in this vehicle is the AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid. This fluid is formulated to reduce friction and keep seals soft, preventing leaks that can lead to a loss of steering assist. It offers excellent high-temperature protection and low-temperature performance, ensuring quiet operation and strong anti-wear properties regardless of the weather conditions or driving style. This synthetic fluid helps maintain the precision and smoothness of the steering input, a key characteristic of the Mercedes-Benz driving experience.
Additional Protection and Maintenance
For vehicle owners who engage in long-term storage, AMSOIL offers specialized products to preserve the vehicle’s condition. AMSOIL Gasoline Stabilizer helps keep fuel fresh for up to 12 months, protecting against varnish and gum buildup, which is crucial for engines that are driven less frequently. Additionally, AMSOIL Engine Fogging Oil provides a highly effective rust preventive coating for internal engine components during periods of inactivity, safeguarding the engine’s internals from corrosion.
During regular maintenance, the use of fuel additives like AMSOIL P.i. Performance Improver can restore up to 14% horsepower and clean GDI fuel injectors back to 100% flow rate. This helps prevent carbon buildup and controls pre-ignition knock, ensuring the engine runs as efficiently as possible. For general cleaning and care, AMSOIL offers a range of products including brake cleaners, degreasers, and car care solutions that protect the vehicle’s exterior and interior without compromising the delicate finishes or materials used in the S63.
About the Vehicle
The 2008 Mercedes-Benz S63 AMG is a standout in the luxury performance sedan category, representing a significant milestone for the AMG division. This model was powered by the formidable M156 engine, a hand-assembled 6.3-liter naturally aspirated V8 that became one of the most celebrated powerplants in automotive history. Known for its muscular acceleration and distinctive, throaty exhaust note, the S63 AMG delivered over 510 horsepower in this generation, offering a driving experience that rivaled dedicated sports cars while providing the comfort and refinement expected of an S-Class.
Introduced to replace the S65, the S63 AMG marked a shift toward larger-displacement naturally aspirated engines, bypassing the turbochargers that were becoming the norm for performance V8s. This engine was built to be a torque monster, providing smooth, linear power delivery that enthusiasts cherished. The vehicle was built on the W221 platform, which was renowned for its advanced safety features, luxurious interior appointments, and sophisticated chassis dynamics. The S63 AMG combined these traits with the sport-tuned suspension, Brembo brakes, and aggressive styling cues that defined the AMG brand.
Owners of this vehicle appreciate its balance of raw performance and daily usability. It serves as a capable grand tourer, easily absorbing the roughness of the road while remaining sharp and engaging when the driver demands more. The combination of the hand-built engine, the 7-speed automatic transmission, and the high-tech interior made the 2008 S63 AMG a desirable choice for those who refused to compromise between luxury and performance. Its reputation as a reliable high-performance sedan continues to make it a sought-after vehicle for collectors and driving enthusiasts alike.