Ensuring your 2009 Mercedes-Benz CL65 AMG runs at peak performance requires fluids that meet the exacting standards of its formidable 6.0L V12 biturbo engine. This high-performance grand tourer is equipped with the robust M275.98 engine code and demands synthetic lubricants capable of withstanding extreme heat and high RPMs. Using the correct oil viscosity, a high-quality AMSOIL motor oil, and proper coolants is essential to protecting the engine’s turbochargers and maintaining the vehicle’s renowned drivability. Regular maintenance with premium synthetics not only extends component life but also preserves the vehicle’s value and driving dynamics.
Recommended AMSOIL Products
- AMSOIL 5W-40 FS 100% Synthetic European Motor Oil – Specifically formulated with a precise blend of synthetic base oils and premium additives for the unique demands of gasoline, diesel, and hybrid European vehicles.
- AMSOIL 0W-40 FS 100% Synthetic European Motor Oil – An ideal choice for extreme temperature protection, offering the European formula required for the CL65 AMG’s high-output engine.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A 50/50 pre-mix formulation that protects cooling system metals, gaskets, and hoses while exceeding OEM requirements.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated coolant option that offers superior protection against metallic corrosion and erosion for extended service intervals.
- AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Designed to withstand 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 OE replacement that protects against wear and ensures smooth shifting for the 722.6 transmission.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Provides excellent ABS and traction-control responsiveness with a 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 while offering strong anti-wear protection.
The 2009 Mercedes-Benz CL65 AMG is powered by the legendary M275 6.0-liter V12 twin-turbo engine, a powerhouse that generates immense torque and horsepower. Because of the high stress placed on engine components, oil capacity is critical. This engine requires 9.5 quarts of oil when performing a standard change with a filter replacement. It is important to note that on models equipped with an external oil cooler, additional oil may be needed if the cooler is drained during service. Allow five minutes after refilling or turning the engine off before checking the oil level to ensure accuracy. The oil drain plug must be torqued to 22 ft/lbs to prevent leaks. For cooling, the system holds approximately 14.7 quarts of coolant, requiring a high-quality antifreeze to manage the heat generated by the massive twin-scroll turbos.
Transmission and Differential Maintenance
The CL65 AMG utilizes a sophisticated automatic transmission, specifically the 722.6 model, which requires precise transmission fluid for smooth operation. A total fill for this transmission system is approximately 9.2 quarts. Selecting the right fluid is vital for protecting the gearbox from wear, sludge, and heat-related degradation. AMSOIL offers both Signature Series and OE Fuel-Efficient options to meet these needs. The Signature Series Fluid-Efficient 100% Synthetic is engineered to withstand the rigors of heavy towing and elevated temperatures, while the OE version provides a reliable, wear-protecting alternative. For the rear differential, the capacity is approximately 3.4 pints, though specific lubricant recommendations for this component were not detailed in the fitment data.
Brake Fluid and Power Steering
Maintaining safety systems is paramount for a vehicle of this caliber. The braking system on the CL65 AMG requires a high-performance DOT 4 fluid. AMSOIL’s DOT 3 and DOT 4 100% Synthetic Brake Fluid is recommended to ensure optimal pedal feel and responsiveness, even under the heavy loads typical of a grand tourer. Additionally, the power steering system benefits from the AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid. This fluid helps seals remain soft to prevent leaks and offers excellent high-temperature protection, ensuring quiet and smooth steering operation for the heavy vehicle.
Seasonal Storage and Fuel Care
If the vehicle is subjected to seasonal storage, proper protection is necessary to prevent corrosion and fuel degradation. AMSOIL Gasoline Stabilizer can keep fuel fresh for up to 12 months, protecting against varnish and gum buildup and fighting ethanol corrosion. For long-term engine protection, the AMSOIL Engine Fogging Oil is a highly-effective rust preventive designed to safeguard internal components during periods of inactivity. Furthermore, the AMSOIL P.i. Performance Improver Gasoline Additive is recommended to restore fuel injectors to 100% flow rate, improve fuel economy, and help prevent carbon buildup and pre-ignition knock, ensuring the engine performs efficiently throughout its operating range.
About the Vehicle
The 2009 Mercedes-Benz CL65 AMG represents the pinnacle of luxury performance coupes from the early 2000s. Based on the W216 S-Class platform, the CL-Class is a grand tourer designed to blend the comfort of a high-end sedan with the aggressive styling and power of a sports car. The CL65 AMG variant, in particular, stands out due to its hand-built 6.0-liter V12 twin-turbo engine. This powerplant is not just a standard upgrade; it is a masterpiece of engineering that produces a staggering amount of low-end torque, making the car feel incredibly powerful even at low speeds while delivering blistering top-end speed.
Owners of the CL65 AMG often prize this vehicle for its ability to cover vast distances in absolute silence and comfort, yet deliver exhilarating performance on demand. The combination of the twin-scroll turbos and the direct injection system allows for rapid acceleration that rivals dedicated sports cars of the era. However, the very complexity and power of this engine mean that it places unique demands on its lubrication system. The high compression and turbocharger speeds generate significant heat, necessitating a fluid that can maintain its viscosity and protective properties under extreme thermal stress. Regular maintenance with high-quality synthetic fluids is not merely a recommendation for this vehicle; it is a necessity to preserve the integrity of the engine, transmission, and other high-performance components that define the CL65 AMG experience.