Maintaining the 2009 Mercedes-Benz CL600 requires a level of fluid precision that standard mineral oils simply cannot provide. This luxury performance sedan houses a complex 5.5-liter twin-turbocharged V12 engine that operates under extreme thermal and mechanical stress. To ensure longevity and preserve the vehicle’s legendary driving dynamics, it is essential to use lubricants formulated specifically for high-performance European engineering. AMSOIL synthetic lubricants meet and exceed the rigorous demands of this vehicle, offering superior protection against the high temperatures generated by the turbochargers and the delicate tolerances of the transmission and cooling systems.
Recommended AMSOIL Products
- AMSOIL 5W-40 FS 100% Synthetic European Motor Oil – Specifically engineered with a precise blend of synthetic base oils and premium additives designed for the unique demands of gasoline, diesel, and hybrid European vehicles, ensuring protection in all temperatures.
- AMSOIL 0W-40 FS 100% Synthetic European Motor Oil – A high-performance European formula providing exceptional cold-start protection and high-temperature stability for this twin-turbocharged powerplant.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – An ethylene glycol 50/50 pre-mix formulation that is phosphate-, nitrate-, nitrite-, silicate-, borate-, and amine-free, compatible with all coolant colors and protecting all cooling system metals and hoses.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated coolant requiring mixing with distilled water that offers superior thermal stability and vastly surpasses standards for metallic corrosion and erosion.
- AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Withstands the rigors of heavy towing and elevated temperatures while remaining fluid in sub-zero conditions to protect the 5-speed 722.6 transmission.
- AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Designed to protect against wear and maintain fluid performance for long service intervals in automatic transmissions.
- 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 for reliable stopping power.
- 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 excellent high-temperature performance.
Why Fluid Choice Matters for the CL600
The 2009 Mercedes-Benz CL600 is not a standard luxury vehicle; it is a high-performance grand tourer equipped with the legendary M275 5.5-liter biturbo V12 engine. This powertrain generates immense torque and heat, particularly under hard driving or towing conditions. The standard maintenance intervals and fluid specifications provided by manufacturers are often based on severe driving cycles, but they frequently rely on conventional chemistry that degrades over time. In a vehicle with a twin-turbo setup, thermal breakdown is a primary enemy. Standard oils may thin out or form sludge, leading to increased wear on critical components like the variable valve timing system, camshafts, and crankshaft bearings.
Using a full synthetic European formula like the AMSOIL 5W-40 FS or 0W-40 FS is not merely a preference; it is a necessity for optimal performance. These fluids are chemically engineered to withstand the extreme temperatures found in the cylinder heads and oil galleries of this V12. The oils maintain a stable viscosity, ensuring that a protective film remains between moving parts even during aggressive acceleration or high-speed cruising on the Autobahn. Furthermore, the fluid’s resistance to oxidation prevents the formation of deposits that can clog the sensitive oil passages and the intricate hydraulic systems associated with the turbochargers. This stability translates directly to smoother engine operation, reduced noise, and an extended lifespan for the engine’s internal components.
The cooling system is equally critical. The massive V12 engine requires efficient heat dissipation to prevent warping or head gasket failure. The recommended capacity for the High Temperature Coolant Circuit (HTCC) is 9.3 quarts, while the Low Temperature Coolant Circuit (LTCC) holds 1.6 quarts. Using a coolant that offers protection up to 150,000 miles ensures that the vehicle’s cooling system remains free of corrosion, scale, and cavitation. This is particularly important for the aluminum components in the engine block and cylinder heads, which are susceptible to electrochemical corrosion if the coolant additives deplete. AMSOIL coolants are formulated to be compatible with all existing coolant colors and materials, ensuring that a complete flush or top-off provides maximum protection without introducing incompatibility issues.
Transmission and Drivetrain Protection
The 2009 CL600 is mated to a sophisticated 5-speed automatic transmission (model 722.6), a unit renowned for its smooth shifts but one that benefits significantly from high-quality synthetic fluids. The transmission requires a total fill of 8.1 quarts during a complete change. The stress placed on this transmission, especially when managing the torque output of a twin-turbo V12, demands a fluid that can handle extreme shear and temperature fluctuations. AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid is designed to withstand the rigors of heavy towing and elevated temperatures while remaining fluid in sub-zero conditions.
The fluid provides reserve protection during heavy use, preventing the wear and sludge buildup that can lead to harsh shifting or transmission failure. For those who prefer a slightly different specification or are looking for an OE-focused formulation, the AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid offers robust protection against wear, ensuring the hydraulic components and clutches remain in peak operating condition. Proper fluid maintenance in this area is crucial for preserving the vehicle’s smooth ride quality and handling capabilities, which are hallmarks of the CL600 driving experience.
While the CL600 does not have a traditional differential with high gear stress, the rear axle does require lubrication. The capacity for the rear differential is 3.4 pints. Ensuring this area is properly lubricated is essential for maintaining the integrity of the drivetrain and preventing noise or vibration that can compromise the ride comfort. Additionally, the braking system and power steering system require specific attention. The AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid should be replaced with a DOT 4 standard synthetic fluid to ensure consistent pedal feel and ABS responsiveness, while the power steering system benefits from a Power Steering Fluid that keeps seals soft and prevents leaks, maintaining the quiet and precise steering feel expected in this class of vehicle.
Additional Maintenance and Storage
For owners who do not drive their CL600 daily, seasonal storage preparations are vital to prevent fuel degradation and engine rust. The AMSOIL Gasoline Stabilizer is highly effective at keeping fuel fresh for up to 12 months, protecting against varnish and gum buildup that can clog injectors. This is particularly important for vehicles with high-performance direct injection systems or those that may be stored for extended periods during the off-season. The fuel stabilizer fights ethanol corrosion, a common issue with modern gasoline blends, ensuring that the fuel system remains clean and ready for use when the car is driven again.
When preparing the engine for storage, the AMSOIL Engine Fogging Oil is an invaluable tool. This highly effective rust preventive protects internal engine components by coating critical surfaces, preventing rust and corrosion during long periods of inactivity. By fogging the cylinders and internal mechanisms, the engine remains in a state of readiness, eliminating the need for a major overhaul or cleaning process when the vehicle is taken out of storage. These supplementary products, combined with the primary lubricants, ensure that the CL600 remains in pristine condition, ready to deliver its signature performance whenever the owner chooses to drive it.
About the 2009 Mercedes-Benz CL600
The 2009 Mercedes-Benz CL600 represents the pinnacle of German engineering in the luxury coupe segment, inheriting the platform and mechanicals from the S-Class sedan but wrapped in a sleeker, two-door body style. This model is powered by the M275 5.5-liter twin-turbo V12 engine, a powerplant that delivered exceptional performance with a smoothness that few other engines could match. The CL600 was designed as a grand tourer, blending high-speed stability with a plush, isolated ride quality that made long journeys effortless.
Owners of the CL600 often appreciate its blend of understated elegance and raw power. The car sits on a long wheelbase, which contributes to its commanding road presence and luxurious interior space. The exterior design features the classic Mercedes-Benz cues of the late 2000s, including a prominent grille, sharp LED headlamps, and elegant chrome accents. Inside, the cabin is a sanctuary of leather, wood, and advanced technology, offering features like the COMAND infotainment system, heated and cooled seats, and a premium Burmester sound system.
Under the hood, the twin-turbocharged V12 is the heart of the car, producing around 510 horsepower and 553 lb-ft of torque. This immense power is managed by a 5-speed automatic transmission that shifts smoothly, allowing the driver to accelerate effortlessly without the harshness sometimes associated with high-performance vehicles. The suspension system, often featuring air suspension, provides a ride quality that absorbs road imperfections with ease, making the CL600 a comfortable cruiser as well as a performance machine. It was a favorite among those who wanted the prestige and capability of a V12 engine without the bulk of a full-sized sedan, making it a highly sought-after vehicle in the collector and luxury market today. Proper maintenance, especially with high-quality synthetic fluids, is key to keeping this masterpiece of automotive history running smoothly for years to come.