Maintaining the 2008 Mercedes-Benz CL63 AMG requires precise fluid specifications to handle the demands of its high-performance 6.3L V8 engine. This vehicle, equipped with a DOHC engine code E, operates under significant thermal and mechanical stress, making the choice of lubricants critical for longevity and performance. Proper maintenance involves more than just an oil change; it encompasses a complete fluid service strategy that includes the engine, transmission, cooling system, and braking components. Using fluids formulated specifically for European engineering standards ensures that all protective coatings and flow characteristics meet the manufacturer’s rigorous requirements.
Recommended AMSOIL Products
For the 2008 Mercedes-Benz CL63 AMG, AMSOIL offers a comprehensive lineup of 100% synthetic fluids designed to exceed OEM specifications. The following products are recommended based on the vehicle’s specific capacities and chemical needs:
- AMSOIL 5W-40 FS 100% Synthetic European Motor Oil – This oil is designed specifically for the unique demands of European gasoline, diesel, and hybrid vehicles, featuring a precise blend of synthetic base oils and premium additives to protect the 6.3L engine.
- AMSOIL 0W-40 FS 100% Synthetic European Motor Oil – An ideal alternative viscosity for this AMG, providing excellent flow at startup and robust protection at operating temperatures, formulated to meet strict European standards.
- AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Withstands the rigors of heavy towing, elevated temperatures, and challenging terrain, remaining fluid in sub-zero conditions to protect the 7-speed 722.9 transmission.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A unique poly-organic acid (OAT) formulation that protects all cooling system metals, gaskets, and hoses, engineered to exceed original equipment manufacturer requirements for this vehicle.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Provides excellent ABS and traction-control responsiveness with stable viscosity over a wide temperature range, approved for use with Mercedes-Benz specifications.
- AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid – Reduces friction and helps seals remain soft to prevent leaks, offering strong anti-wear protection and excellent high-temperature performance for the power steering system.
- AMSOIL P.i. Performance Improver Gasoline Additive – Restores fuel injectors to 100% flow rate and improves fuel economy, helping to prevent carbon buildup that can affect the performance of this high-compression engine.
Engine Oil Specifications and Capacities
The heart of the 2008 CL63 AMG is its 6.3-liter naturally aspirated V8 engine. To ensure optimal lubrication, the engine requires 9.3 quarts of oil when performing a full change with a filter replacement. For owners servicing the engine with the oil cooler drained, additional oil may be necessary to maintain proper levels. The recommended torque for the oil drain plug is 22 ft/lbs, a specific detail that helps prevent thread damage during service. After refilling the engine, it is crucial to allow at least five minutes before turning the engine off or checking the oil level to ensure accurate readings and proper circulation.
Both AMSOIL 5W-40 FS and 0W-40 FS 100% Synthetic European Motor Oils are engineered to handle the extreme heat and pressure generated by this high-performance AMG powerplant. These fluids are designed to withstand severe service conditions, offering superior wear protection compared to standard conventional oils. The European formula includes a precise blend of synthetic base oils and premium additives that are essential for the longevity of the engine’s internal components, including the high-output camshafts and bearings typical of Mercedes-AMG designs.
Transmission and Differential Protection
The transmission in the 2008 Mercedes-Benz CL63 AMG is a critical component that requires fluid specifically compatible with the 722.9 series 7-speed automatic transmission. The capacity for a total fill is 9.3 quarts. It is important to note that there are variations based on the data card code; models without the code A89 (Reduced-Friction) and those with the code A89 may have specific fluid requirements, though the AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid is formulated to meet the broad spectrum of these requirements.
AMSOIL’s fuel-efficient transmission fluid provides reserve protection during heavy use and abuse, ensuring the transmission remains fluid even in sub-zero temperatures. This protection is vital for an AMG that is often subjected to spirited driving. For the rear differential, the capacity is listed as 3.4 pints. Proper lubrication of the differential ensures that the power transfer to the rear wheels is smooth and efficient, reducing noise and wear on the gears during high-torque acceleration events. Additionally, AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid offers a cost-effective alternative for wear protection in these applications.
Cooling and Brake Fluid Services
Effective thermal management is essential for the 6.3L engine. The cooling system requires 11.3 quarts of antifreeze and AMSOIL Passenger Car & Light Truck Antifreeze & Coolant. This product offers protection up to 150,000 miles or 5 years, whichever comes first, in passenger cars. This formulation is phosphate-, nitrate-, nitrite-, silicate-, borate-, and amine-free, making it compatible with the metals and seals used in the Mercedes cooling system. Alternatively, the AMSOIL Propylene Glycol Antifreeze and Engine Coolant is available as a concentrated option that requires mixing with distilled or high-quality water, offering extended protection up to 150,000 miles or 5 years.
Braking performance must remain reliable for safety-critical driving. The CL63 AMG requires DOT 4 plus fluid, which corresponds to specifications like MB Sheet 331.0. AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid is designed to provide excellent ABS and traction-control responsiveness. It maintains a stable viscosity over a wide temperature range, ensuring consistent pedal feel and stopping power whether the vehicle is being driven on a track or navigating city streets.
About the Vehicle
The 2008 Mercedes-Benz CL63 AMG represents a pinnacle of luxury grand touring performance. As part of the S-Class platform lineage, the CL63 AMG combines the opulence and safety of a flagship luxury coupe with the raw power of a track-capable sports car. The 2008 model year was a significant period for the AMG division, as they continued to refine their naturally aspirated 6.3-liter V8 engine, often referred to as the M156 engine in this era. This engine was renowned for its high power output, smooth delivery, and exceptional build quality, producing a driving experience that was both refined and exhilarating.
Owners of this vehicle typically value its dual nature: it serves as a comfortable daily driver with advanced technology and sound insulation, yet it transforms into a high-performance machine when spirited driving is required. The CL-Class body style offers a sleek, two-door coupe silhouette with a long wheelbase, providing a stable and planted ride that inspires confidence at high speeds. As a German engineering icon, the CL63 AMG attracts enthusiasts who appreciate the precision handling, premium materials, and the distinct pedigree of the Mercedes-AMG brand. Maintaining this vehicle with high-quality synthetic lubricants ensures that it retains its reputation for reliability and performance for years to come.
Maintenance Best Practices
Regular maintenance extends the life of the vehicle significantly. Beyond the fluid changes, using additives like the AMSOIL P.i. Performance Improver Gasoline Additive can help keep the fuel system clean, which is especially beneficial for direct injection systems and engines that may experience carbon buildup. During seasonal storage, products like the AMSOIL Gasoline Stabilizer can keep fuel fresh for up to 12 months, protecting against varnish and gum buildup, while AMSOIL Engine Fogging Oil can be used to protect internal engine components from rust during long periods of inactivity. These additional steps ensure that when the vehicle is ready to run again, the engine is in optimal condition.
The comprehensive care of the CL63 AMG extends to exterior and undercarriage protection as well. For owners concerned about corrosion, especially in regions with road salt, the Heavy-Duty Metal Protector offers a long-lasting, wax-like coating that shields steel, iron, and aluminum surfaces from moisture and chemical corrosion. This holistic approach to vehicle care, utilizing top-tier synthetic lubricants and protective products, ensures that the 2008 Mercedes-Benz CL63 AMG remains a reliable and high-performing automobile for its owners.