Maintaining the 2009 Mercedes-Benz CLK63 AMG requires precise fluid specifications to handle its high-revving 6.3L V8 engine and sophisticated 7-speed automatic transmission. The CLK63 AMG is built for performance, demanding lubricants that can withstand extreme heat, high shear forces, and the specific material requirements of European engineering. Using the correct oils and fluids ensures that the engine’s Variable Cam Timing (VVT) system operates smoothly, the transmission shifts without hesitation, and the cooling system protects the powerful M156 engine from thermal breakdown.
Recommended AMSOIL Products
- AMSOIL 5W-40 FS 100% Synthetic European Motor Oil – A European-formulated synthetic oil designed specifically for the high-temperature demands of the CLK63’s DOHC engine, offering precise additive blending for extended service life.
- AMSOIL 0W-40 FS 100% Synthetic European Motor Oil – Provides superior cold-start protection and high-temperature stability for the 6.3L engine, ensuring optimal viscosity under all operating conditions.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A 50/50 pre-mix ethylene glycol formulation that protects cooling system metals and hoses, capable of lasting up to 150,000 miles or 5 years.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated, eco-friendlier option that provides exceptional corrosion protection and can be mixed to meet specific temperature requirements for the European cooling system.
- AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Engineered to withstand the rigors of the 722.9 transmission, offering reserve protection during heavy use and maintaining fluidity in extreme temperatures.
- AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – A cost-effective OE-grade synthetic fluid that protects against wear and ensures smooth shifting performance for the CLK63 AMG.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Delivers excellent responsiveness for ABS and traction-control systems with stable viscosity over a wide temperature range, meeting strict MB Sheet 331.0 approval standards.
- AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid – Formulated to reduce friction, keep seals soft to prevent leaks, and resist high temperatures for long fluid life in the CLK’s hydraulic system.
The engine compartment of the CLK63 AMG houses one of the most naturally aspirated V8 engines of its era. To keep this powerplant running smoothly, you must adhere to the correct fluid capacity and change intervals. The engine requires a substantial volume of oil due to the internal volume of the V8 and the oil cooler system. The total capacity is 9.3 quarts when including the oil filter change. If your specific model features an oil cooler, you must account for additional oil when draining the cooler lines to ensure the system is properly filled. After refilling, it is critical to allow five minutes for the oil to settle before checking the dipstick for an accurate reading. The oil drain plug must be torqued to 22 ft/lbs to prevent leaks while ensuring the gasket seals correctly against the high pressure generated by the high-revving 6.3L engine.
While the engine receives the most attention, the transmission is equally vital for this high-performance coupe. The 2009 CLK63 AMG utilizes the 7G-Tronic (722.9) 7-speed automatic transmission. Whether your vehicle has the standard setting or the Reduced-Friction (A89) code, the fluid requirements remain critical. The total fill capacity for this transmission is 9.5 quarts. Using a fluid that meets the specific OEM requirements while offering superior thermal stability is essential for the longevity of the torque converter and shift clutch packs. AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid and AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid offer formulations that exceed OEM standards, providing protection against sludge and wear even during spirited driving or towing scenarios.
Beyond the powertrain, the safety and maintenance systems of the CLK63 require high-quality fluids. The braking system relies on AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid, which offers a higher boiling point than conventional fluids, which is crucial for preventing brake fade during hard cornering or track use. Similarly, the power steering system benefits from AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid that resists oxidation and maintains seal integrity, preventing the leaks that often plague older European luxury vehicles as they age. The cooling system must also be capable of managing the heat generated by the V8; AMSOIL Passenger Car & Light Truck Antifreeze & Coolant and AMSOIL Propylene Glycol Antifreeze and Engine Coolant are designed to be phosphate-, nitrate-, and silicate-free, which is compatible with the specific materials used in Mercedes cooling systems.
For those who maintain this vehicle as a show piece or a garage find, seasonal preparation is key. If you plan to store the CLK63 AMG for extended periods, treating the fuel system with a stabilizer prevents the degradation of gasoline and the formation of varnish that can clog fuel injectors. AMSOIL Gasoline Stabilizer is essential for preventing fuel issues during storage. An AMSOIL Engine Fogging Oil can also be used to coat internal components and prevent rust during storage, ensuring the engine starts smoothly when the season returns. These small steps significantly extend the life of the vehicle during downtime and protect your investment.
About the Vehicle
The 2009 Mercedes-Benz CLK63 AMG represents the pinnacle of the CLK Class before the lineage transitioned into the E-Class coupes. Powered by the M156 6.3L naturally aspirated V8 engine, this vehicle was a favorite among enthusiasts for its raw power and distinct exhaust note. The engine produces around 480 horsepower, delivering acceleration that rivals many modern sports cars, all without the turbo lag associated with smaller displacement forced-induction engines. The platform, known as the C209 generation, was widely regarded as one of the most stylish and driver-focused coupes Mercedes produced in the 2000s, blending luxury with genuine performance capabilities.
Owners of the CLK63 AMG often value the vehicle for its dual nature as a daily driver and a weekend track weapon. The 7-speed automatic transmission (7G-Tronic) was a significant advancement at the time, offering paddle shifters for manual control and rapid response times. The suspension is tuned to provide a firm, connected feel to the road without sacrificing the ride quality typical of a Mercedes-Benz. Produced at the Tuscaloosa Assembly Plant in Alabama, the CLK63 AMG brought American manufacturing precision to the global stage. As these vehicles age, proper maintenance becomes even more critical to prevent expensive repairs on the suspension and engine components, making the choice of high-quality lubricants a wise investment for the long-term health of the car.