The 2007 Mercedes-Benz CLS550 is a vehicle that demands precision and consistent high-performance lubrication. Its powerful 5.5L V8 engine, specifically the 273.960.0 engine code, operates at the limit of engineering, requiring a fluid that can withstand high stress, extreme temperatures, and the unique tolerances of European manufacturing. Using the wrong oil or fluid can lead to increased wear, reduced fuel economy, and premature failure of critical components. Proper maintenance is not just about keeping the car running; it is about preserving the driving dynamics and longevity of a luxury grand tourer.
Recommended AMSOIL Products
To ensure your CLS550 receives the protection it deserves, AMSOIL has formulated a specific lineup of synthetic lubricants. These products are designed to exceed the strict requirements of Mercedes-Benz while offering extended service intervals and superior engine protection.
- AMSOIL 5W-40 FS 100% Synthetic European Motor Oil – This oil features a precise blend of synthetic base oils and premium additives tailored specifically for the unique demands of European gasoline, diesel, and hybrid vehicles. It provides excellent thermal stability and wear protection.
- AMSOIL 0W-40 FS 100% Synthetic European Motor Oil – Offering enhanced low-temperature protection, this viscosity grade ensures rapid flow during cold starts while maintaining a robust film strength at high operating temperatures, ideal for the rigorous demands of the 2007 CLS550 engine.
- AMSOIL Oil Filter – Designed to provide a filtering efficiency of 99 percent at 20 microns, this high-capacity filter traps wear-causing contaminants more effectively than standard filters, reducing engine wear and extending service life.
- WIX Oil Filter – A premium alternative featuring advanced media that offers improvements over original equipment manufacturer-branded filters, ensuring reliable filtration for your vehicle’s oil change.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – This unique poly-organic acid formulation exceeds OEM requirements and protects the cooling system metals, gaskets, and hoses. It is a phosphate-, nitrate-, nitrite-, silicate-, borate-, and amine-free 50/50 pre-mix that offers up to 150,000 miles of protection.
- 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. This fluid provides reserve protection during heavy use and helps prevent sludge buildup in the 722.9 transmission.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Formulated for excellent ABS and traction-control responsiveness, this fluid maintains stable viscosity over a wide temperature range, ensuring consistent braking performance even under the most demanding driving conditions.
- AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid – Reduces friction and helps seals remain soft to prevent leaks. It resists heat for long fluid life and offers strong anti-wear protection, ensuring quiet operation of your power steering system.
Selecting the correct viscosity and capacity is the first step in maintaining this high-performance machine. The engine oil capacity for the 2007 Mercedes-Benz CLS550 is 9.0 quarts when a filter change is performed. After refilling, it is crucial to check the oil level to ensure it is within the proper range. The recommended viscosities include 0W-20, 0W-30, and 0W-40 for all temperatures, with 5W-30 and 5W-40 suitable for temperatures above -25°C. Beyond the engine, the automatic transmission requires a full fill of 9.7 quarts for the 722.9 transmission. The cooling system holds 11.9 quarts of antifreeze, ensuring the powerful 5.5L V8 remains cool even during spirited driving or in peak summer heat.
Comprehensive Protection for Engine and Drivetrain
The heart of the CLS550 is the M273 engine, a 5.5-liter naturally aspirated V8 that produces substantial power. While this engine is renowned for its smoothness and torque, it operates in a tight tolerance environment that benefits significantly from synthetic lubrication. Standard mineral oils can break down under the heat generated by this engine, leading to sludge formation and increased oil consumption. AMSOIL’s European formula motor oils are designed to resist thermal breakdown, ensuring that the oil film remains intact on critical engine components like the camshafts and valve train.
Filtration is equally critical. The AMSOIL Oil Filter captures microscopic particles that standard filters might allow to pass, which is vital for the longevity of the hydraulic lifters and variable valve timing mechanisms often found in these engines. For those who prefer an alternative filter brand, the WIX Oil Filter also offers premium media and robust construction suitable for high-mileage European vehicles.
The transmission system in the CLS550, specifically the 7-speed automatic with the 722.9 designation, requires a fluid that can handle rapid shifts and high heat. The AMSOIL Signature Series Fuel-Efficient Automatic Transmission Fluid is engineered to withstand the rigors of heavy towing and elevated temperatures. It remains fluid in sub-zero conditions and provides reserve protection during heavy use. The alternative AMSOIL OE Fuel-Efficient Automatic Transmission Fluid also offers excellent protection against wear and is a solid choice for maintaining shift quality and transmission longevity.
Cooling the engine is a constant challenge, particularly in a car with the power density of the CLS550. The cooling system capacity is 11.9 quarts. Using a high-quality AMSOIL Propylene Glycol Antifreeze and Engine Coolant ensures that the system is protected against corrosion and boiling. This OAT formulation is compatible with all other antifreeze colors and protects metal surfaces, gaskets, and hoses. For those who prefer a concentrate, the AMSOIL Propylene Glycol Antifreeze offers extended protection, lasting up to 150,000 miles or 5 years in passenger cars.
Essential Fluids for Braking and Steering
Safety and control are paramount in a luxury performance vehicle. The braking system requires a fluid that does not absorb moisture easily and maintains a consistent boiling point. The AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid is formulated to meet or exceed Mercedes-Benz requirements, providing excellent ABS responsiveness and a stable viscosity across a wide temperature range. This ensures that pedal feel remains consistent and braking power is never compromised.
Similarly, the power steering system benefits from synthetic lubrication. The AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid helps seals remain soft to prevent leaks, resists heat degradation, and offers superior anti-wear protection. This fluid is formulated for quiet operation, reducing the noise often associated with power steering pumps in high-mileage vehicles. By keeping these fluids fresh, owners can maintain the precise handling characteristics that define the CLS550 experience.
About the Vehicle
The 2007 Mercedes-Benz CLS550 represents a unique chapter in automotive history, bridging the gap between a sleek two-door coupe and a practical four-door sedan. Debuting as the CLS-Class, Mercedes-Benz redefined the “four-door coupe” segment, creating a body style that was as aerodynamic and stylish as a sports car but retained the utility of a traditional sedan. The CLS550, in particular, was the flagship model, equipped with the formidable 5.5-liter M273 V8 engine. This powerplant was a masterpiece of German engineering, delivering a smooth and powerful driving experience that appealed to enthusiasts and luxury buyers alike.
At the time of its release, the CLS550 was a flagship of the brand’s styling, characterized by its sweeping roofline and distinctive “frameless door” design. The interior reflected the high standards of the S-Class platform, which served as its architectural foundation, offering plush seating and advanced technology for its time. The driving character of the CLS550 was defined by a blend of luxury and agility. Despite its substantial curb weight, the powerful V8 provided effortless acceleration, allowing the car to feel both relaxed on a long highway commute and energetic when driven with purpose. The 7-speed automatic transmission, paired with the engine, ensured that power delivery was seamless and intuitive.
For owners of the CLS550, the vehicle offers a unique blend of style and performance that remains highly sought after. It is a car that turns heads due to its distinctive silhouette, yet it serves as a comfortable daily driver. The platform, known for its solid build quality and refined ride, has earned a reputation for reliability when properly maintained. However, like any high-performance vehicle, it requires diligent care to ensure its longevity and performance capabilities remain intact.
There are specific areas where owners of the CLS550 often encounter challenges, and using high-performance synthetic lubricants can be a proactive solution to these common issues. One prevalent issue in this engine family is oil consumption and sludge formation if synthetic oils are not used. The M273 engine benefits greatly from the thermal stability of AMSOIL products, which help prevent the breakdown of oil film and the formation of carbon deposits that can lead to increased oil consumption. Another common concern involves the cooling system, where corrosion and sediment buildup can occur over time. Regular use of a high-quality, extended-life antifreeze like AMSOIL Passenger Car & Light Truck Antifreeze & Coolant helps mitigate corrosion and extends the life of the radiator and water pump.
Transmission concerns are also not uncommon, particularly regarding shift quality and heat management after significant mileage. The AMSOIL Signature Series Fuel-Efficient Automatic Transmission Fluid is designed to maintain the hydraulic properties of the transmission fluid, helping to prevent harsh shifts and ensuring smooth operation even as the transmission accumulates miles. Additionally, brake fluid moisture absorption can lead to reduced boiling points and spongy pedal feel. The AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid is highly resistant to moisture absorption, ensuring consistent braking performance and protecting the ABS module from corrosion. Finally, power steering leaks are a known issue in many Mercedes models as seals age. Using a synthetic power steering fluid like AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid can help condition seals and prevent these leaks, maintaining quiet and responsive steering for years longer than conventional fluids.
By addressing these specific needs with the correct synthetic lubricants, CLS550 owners can preserve the vehicle’s performance and value. The combination of the M273 engine’s power and the sophisticated chassis design makes the CLS550 a standout in the luxury segment, provided it receives the care it requires. Whether for a spirited drive or a daily commute, the right fluids ensure that the car continues to deliver the smooth, reliable, and luxurious experience that Mercedes-Benz owners expect.