The 2008 Mercedes-Benz CL63 AMG with the 6.3L DOHC V8 engine is a pinnacle of German engineering, combining luxury with high-performance driving dynamics. Owners of this vehicle demand the highest level of protection to ensure the longevity and optimal performance of their complex engine and transmission systems. Because this car operates at high temperatures and often under high stress, using standard mineral oils or fluids can lead to premature wear, sludge buildup, and costly repairs. AMSOIL synthetic lubricants are formulated to meet and exceed the stringent specifications required by European manufacturers, offering superior thermal stability and wear protection compared to conventional products.
Recommended AMSOIL Products
For the 2008 Mercedes-Benz CL63 AMG, maintaining the correct fluid specifications is critical. The following AMSOIL products are specifically recommended to protect your investment and ensure smooth operation across all driving conditions.
- AMSOIL 5W-40 FS 100% Synthetic European Motor Oil – A premium motor oil designed specifically for the unique demands of European vehicles, featuring a precise blend of synthetic base oils and additives to protect against wear and deposits at high temperatures.
- AMSOIL 0W-40 FS 100% Synthetic European Motor Oil – An alternative viscosity option for European engines, providing excellent cold-start protection and high-temperature stability, ideal for extreme weather or severe driving conditions.
- AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Provides outstanding protection for the 7-speed transmission, withstanding heavy towing, elevated temperatures, and challenging terrain while remaining fluid in sub-zero conditions.
- AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – A cost-effective yet high-performance synthetic transmission fluid that meets original equipment standards, offering excellent wear protection for daily driving.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Ensures superior brake responsiveness with an extremely high boiling point, maintaining stable viscosity over a wide temperature range to prevent brake fade and ABS issues.
- AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid – Reduces friction and helps keep seals soft to prevent leaks, offering excellent high-temperature protection and quiet operation for your power steering system.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A pre-mixed, ethylene glycol formulation that protects against corrosion and extends cooling system life, compatible with all other antifreeze colors and safe for gaskets and hoses.
Proper lubrication extends the service intervals for your vehicle while providing a safety margin against the rigors of high-performance driving. Whether you are extending the time between changes or pushing the vehicle through extreme conditions, these AMSOIL synthetic fluids ensure your engine and transmission remain clean and cool.
Engine Oil Specifications and Maintenance
The heart of the 2008 CL63 AMG is the massive 6.3-liter V8 engine. This powerplant requires a high-quality synthetic oil that can handle the intense heat generated by the compression ratios and high RPMs typical of this AMG model. The recommended oil capacity for a complete change, including the filter, is 9.3 quarts. It is important to note that on models equipped with an external oil cooler, additional oil may be required if the cooler is drained during the service.
When performing an oil change, always allow at least five minutes after refilling or turning off the engine before checking the oil level to ensure an accurate reading on the dipstick. The oil drain plug requires a specific torque setting of 22 ft-lbs to prevent leaks or stripping of the threads. Both AMSOIL 5W-40 and 0W-40 FS European Motor Oils are engineered to handle the “all-temps” requirement, ensuring the oil flows freely in cold starts while maintaining a robust film strength in high-heat scenarios. These oils feature a European formula with a precise blend of synthetic base oils and premium additives designed specifically for gasoline, diesel, and hybrid European vehicles.
Although no specific oil filter recommendation is available in the source data for this vehicle, the use of AMSOIL synthetic motor oil significantly reduces the accumulation of carbon and sludge, which helps keep the engine internal components clean and operational. The extended service life of synthetic oil means fewer filter changes are required over the life of the vehicle compared to conventional oil, further reducing long-term maintenance costs.
Transmission and Cooling System Protection
The 2008 CL63 AMG utilizes a sophisticated 7-speed automatic transmission (722.9 series), which is sensitive to the type of fluid used. For transmissions with code SL057 (without reduced-friction code A89) or code SL058 (with reduced-friction code A89), the total fill capacity is 9.3 quarts. The AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid is an excellent choice for this application, as it remains fluid in sub-zero temperatures and withstands the rigors of heavy towing, elevated temperatures, and challenging terrain.
Thermal management is equally critical for the longevity of the engine and transmission. The cooling system holds approximately 11.3 quarts of coolant. AMSOIL Passenger Car & Light Truck Antifreeze & Coolant is a unique poly-organic acid (OAT) formulation that provides protection for up to 150,000 miles or 5 years. It is phosphate-, nitrate-, nitrite-, silicate-, borate-, and amine-free, ensuring compatibility with all cooling system metals, gaskets, and hoses. For those who prefer a concentrated option, the AMSOIL Propylene Glycol Antifreeze and Engine Coolant offers extended protection, allowing for a mix with distilled water to achieve the desired concentration for your specific climate.
Brake, Steering, and Additional Maintenance
Safety is paramount in a vehicle of this caliber. The braking system requires a fluid that can withstand high temperatures without boiling, which can lead to a spongy pedal or brake failure. The AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid is recommended for this vehicle. It offers excellent ABS and traction-control responsiveness and provides a stable viscosity over a wide temperature range, ensuring consistent braking performance even under heavy use.
The power steering system, labeled PS031, benefits from the synthetic nature of AMSOIL’s Multi-Vehicle Power Steering Fluid. This fluid resists heat degradation, helping to prevent leaks by keeping seals soft and pliable. It is formulated for quiet operation and provides strong anti-wear protection, which is essential for the precision steering components found in the CL-Class.
For seasonal storage, protecting the fuel system and engine internals is essential. AMSOIL Gasoline Stabilizer can keep fuel fresh for up to 12 months, fighting ethanol corrosion and preventing varnish and gum buildup. If the vehicle will be stored for an extended period, the Engine Fogging Oil is an effective rust preventive that protects internal engine components during long periods of inactivity.
About the Vehicle
The 2008 Mercedes-Benz CL63 AMG represents the pinnacle of the CL-Class lineup during that era, serving as a grand touring coupe that blended high-speed capability with ultimate luxury. Based on the Mercedes-Benz R216 platform, the CL63 AMG was powered by the legendary 6.3-liter V8 M156 engine, which was a naturally aspirated powerhouse known for its smooth power delivery and aggressive torque curve. This model was part of Mercedes-Benz’s AMG division, which is responsible for taking production vehicles and enhancing their performance to racing levels.
Owners of the 2008 CL63 AMG appreciate its dual nature as both a comfortable daily driver and a high-performance sports coupe. The interior featured premium leather upholstery, advanced infotainment systems, and exquisite craftsmanship typical of the Mercedes-Benz brand at the time. Under the hood, the 6.3L V8 produced substantial horsepower, making it one of the fastest production coupes available without forced induction like turbos or superchargers. This natural aspiration provided a linear power delivery that enthusiasts found particularly rewarding. The vehicle was designed for long-distance travel, offering a smooth ride quality that isolated occupants from road imperfections while maintaining sharp handling dynamics through its sophisticated suspension systems. As one of the last naturally aspirated AMG V8s, it holds a significant place in automotive history for car enthusiasts who value raw engine characteristics and build quality. Maintaining this vehicle with high-quality synthetic fluids ensures that this heritage of performance and luxury continues for years to come.