The 2023 Mercedes-Benz CLS450 represents a sophisticated blend of luxury sedan comfort and sporty performance, powered by a robust 3.0-liter inline-six engine featuring the 256.930 2 Turbo designation. Maintaining this vehicle requires a precise approach to lubrication, as modern German engineering relies on specific chemical properties in its fluids to manage the high operating temperatures of turbocharged components and the precision tolerances of the transmission and engine. Using the correct synthetic lubricants is not merely about preventing wear; it is about ensuring optimal fuel efficiency, protecting against high-stress thermal breakdown, and maintaining the responsive driving character that defines the CLS line. The manufacturer specifies specific viscosity grades ranging from 0W-20 to 5W-40 depending on ambient temperature, with a total system capacity of 9 quarts including the filter. Proper fluid maintenance extends the service intervals and ensures the complex valve trains and turbochargers receive adequate lubrication under all driving conditions.
Recommended AMSOIL Products
- AMSOIL 5W-30 LS 100% Synthetic European Motor Oil – A precise European formula designed specifically for the high-performance demands of gasoline, diesel, and hybrid vehicles like the CLS450, offering superior thermal stability and protection against high-stress turbochargers.
- AMSOIL 5W-40 MS 100% Synthetic European Motor Oil – An optimal choice for warmer climates or severe service conditions, providing the necessary viscosity for high-temperature protection while maintaining flow at startup for engines requiring 5W-40 grades.
- AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Engineered to withstand the rigors of heavy towing and elevated temperatures while remaining fluid in sub-zero conditions, ensuring smooth shifts and protecting transmission components from wear.
- AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – A cost-effective alternative that delivers exceptional protection against wear and maintains the fluid’s integrity under the severe operating conditions typical of luxury performance sedans.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Formulated to meet and exceed Mercedes-Benz requirements, providing excellent ABS and traction-control responsiveness with a stable viscosity over a wide temperature range to ensure reliable stopping power.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A 50/50 pre-mix formulation that offers protection up to 150,000 miles, safeguarding all cooling system metals, gaskets, and hoses while being compatible with various antifreeze colors.
Ensuring your Mercedes-Benz CLS450 receives the exact fluid specifications it requires is critical for its longevity. The engine’s turbocharged nature generates significant heat, necessitating a synthetic motor oil that resists thermal breakdown and oxidation. The 5W-30 and 5W-40 options listed above are engineered to handle these high temperatures while maintaining the fluidity needed for rapid oil circulation during cold starts. This ensures that critical components, including the camshafts and turbocharger bearings, are lubricated immediately upon ignition. The 9-quart capacity reflects the extensive oiling requirements of this engine block, and using a high-quality oil filter alongside the oil change is essential for maintaining clean oil flow.
Comprehensive Cooling and Transmission Protection
Beyond engine oil, the cooling system of the CLS450 plays a pivotal role in managing the thermal load of the powertrain. The vehicle requires either 12.7 quarts of high-performance antifreeze or 3.2 quarts if using a specific system configuration, making the volume of fluid a significant factor in maintenance costs and effectiveness. The AMSOIL Passenger Car & Light Truck Antifreeze & coolant is an ethylene glycol 50/50 pre-mix that eliminates the need for mixing while offering corrosion protection for all metals within the cooling system. It is free from phosphates, nitrates, nitrites, silicates, borates, and amines, which ensures compatibility with the advanced materials used in modern Mercedes engines. For those who prefer concentrated coolant, the Propylene Glycol Antifreeze and Engine Coolant offers extended protection up to 1,000,000 miles in heavy-duty applications, though the pre-mix is generally more convenient for passenger car service intervals.
The transmission is the other vital area requiring specialized attention. While the vehicle may not list a specific fluid recommendation in all contexts, the transmission operates under high stress and temperature. The Signature Series Fuel-Efficient Automatic Transmission Fluid provides a robust barrier against wear, sludge, and temperature-related degradation. It is designed to remain fluid in sub-zero temperatures, ensuring immediate protection during cold starts, while maintaining viscosity stability during the high heat generated by the turbocharged engine’s power delivery. This fluid helps extend the life of the transmission by reducing friction and preventing the formation of deposits that can lead to slipping or harsh shifting. The OE Fuel-Efficient option serves as an equally reliable alternative for owners seeking a high-performance synthetic fluid that adheres to OEM standards.
Brake Fluid and Fluid Management Systems
Safety is paramount in a vehicle of this caliber, making brake fluid quality non-negotiable. The CLS450 requires DOT 4 Plus fluid or products approved on MB Sheet 331.0. The AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid is a top-tier choice that meets these stringent requirements. It is engineered to deliver excellent responsiveness for both ABS and traction control systems, which are integral to the CLS450’s handling dynamics. By preventing moisture absorption and maintaining a stable viscosity across a wide temperature spectrum, this brake fluid ensures consistent pedal feel and reliable stopping power in all weather conditions. It is a vital component of the vehicle’s safety systems, preventing the boiling of fluid under heavy braking which can lead to brake fade.
Seasonal and Performance Enhancements
For owners who utilize seasonal storage or wish to maximize the performance of their vehicle, AMSOIL offers a range of additives and protectants. The AMSOIL P.i. Performance Improver Gasoline Additive is a powerful tool for maintaining engine health. It works to clean fuel injectors, including those in Gasoline Direct Injection (GDI) systems, restoring up to 100% of their flow rate after a single tank. This process can restore up to 14% horsepower and improve fuel economy, effectively reducing the need for higher-octane fuels. For vehicles stored for extended periods, the AMSOIL Gasoline Stabilizer keeps fuel fresh for up to 12 months, fighting ethanol corrosion and preventing the varnish and gum buildup that can clog fuel systems. Additionally, the Engine Fogging Oil provides a protective layer of rust prevention for internal engine components during long periods of inactivity, ensuring the engine is ready to run smoothly whenever it is started again.
Essential Maintenance and Cleaning
Maintenance extends to the physical cleanliness and protection of the vehicle’s surfaces and mechanical components. The AMSOIL Synthetic Multi-Purpose Grease offers superior resistance to thermal and oxidation degradation, making it ideal for chassis points and moving parts that require long-term performance. For exterior and interior maintenance, the AMSOIL Miracle Wash Waterless Wash and Wax Spray provides a protective finish without the need for water, repelling dust and dirt while shielding the paint from UV rays. For cleaning tasks, the AMSOIL Heavy-Duty Degreaser effectively removes oil, tar, and grime from engine surfaces, while the Brake and Parts Cleaner ensures that brake components are free of contaminants that could cause squeal or chatter. These products, combined with the silicone spray for rubber and plastic protection, ensure that the vehicle remains in pristine condition, protecting the finish and mechanical seals from the elements.
About the 2023 Mercedes-Benz CLS450
The 2023 Mercedes-Benz CLS450 continues the legacy of the CLS coupe sedan, a body style that Mercedes-Benz popularized with the first-generation CLS in the mid-2000s. This four-door coupe is characterized by its dramatic, sloping roofline that merges the sporty aesthetic of a coupe with the practicality and accessibility of a sedan. Under the hood, the CLS450 is powered by a 3.0-liter twin-scroll turbocharged inline-six engine paired with a 48-volt EQ Boost mild-hybrid system. This powertrain delivers a significant amount of torque, providing the vehicle with an effortless yet spirited driving character. The integration of the 48-volt system allows for smoother start-stop functionality and an additional torque boost during acceleration, enhancing the car’s dynamic capabilities.
Positioned as a luxury performance sedan, the CLS450 competes in a segment defined by sleek design and advanced technology. It features a sophisticated interior with high-quality materials, advanced infotainment systems, and a range of driver-assistance technologies. The vehicle is known for its agility and handling, thanks to its suspension setup and rear-wheel-biased all-wheel-drive system, which provides traction in various conditions while maintaining the engaging feel preferred by enthusiasts. Originating from Germany, the CLS line represents Mercedes-Benz’s commitment to blending style with engineering excellence. It is a favorite among owners who desire a unique vehicle that stands out from the standard sedan lineup without sacrificing the luxury and comfort expected from the brand. The CLS450, with its turbocharged power and hybrid assistance, offers a modern solution for those who appreciate the harmony of performance and efficiency in a daily driver.