The 2018 Mercedes-Benz SL63 AMG is a pinnacle of engineering, featuring a twin-turbocharged 5.5-liter V8 engine (Engine Code 157.98.6) that delivers immense power and sophisticated performance. To maintain the integrity of this high-output powertrain and its complex systems, using lubricants designed specifically for European performance requirements is essential. Proper maintenance not only extends the vehicle’s lifespan but also ensures that the turbochargers, transmission, and cooling systems operate within optimal parameters under extreme thermal and mechanical stress.
Recommended AMSOIL Products
- AMSOIL 5W-40 FS 100% Synthetic European Motor Oil – Specifically formulated for gasoline, diesel, and hybrid European vehicles with a precise blend of synthetic base oils and premium additives to handle the rigors of the SL63’s twin-turbo engine.
- AMSOIL 0W-40 FS 100% Synthetic European Motor Oil – An alternative viscosity option designed for the unique demands of European vehicles, providing exceptional cold-start protection and high-temperature stability for extreme conditions.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A unique poly-organic acid (OAT) formulation that protects cooling system metals, gaskets, and hoses while exceeding original equipment manufacturer requirements for up to 150,000 miles or five years.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated coolant that greatly surpasses standards for metallic corrosion and erosion, offering protection up to 150,000 miles or five years and compatibility with all coolant colors.
- AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Withstands the rigors of the SL63’s 7-speed transmission, including heavy towing, elevated temperatures, and challenging terrain, while remaining fluid in sub-zero temperatures.
- AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Provides robust wear protection for the automatic transmission, ensuring smooth shifting and longevity under severe driving conditions.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Delivers excellent ABS and traction-control responsiveness with a stable viscosity over a wide temperature range, meeting the high standards required by Mercedes-Benz sheet 331.0.
- AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid – Reduces friction and helps seals remain soft to prevent leaks, offering strong anti-wear protection and excellent high-temperature performance for quiet operation.
Proper fluid selection for the SL63 AMG goes beyond simple compliance; it is about maximizing the potential of the vehicle’s engineering. The engine oil is perhaps the most critical component. With a capacity of 9 quarts including the filter change, the oil must handle the intense heat generated by the twin-scroll turbochargers and the high compression of the V8. AMSOIL 5W-40 FS and AMSOIL 0W-40 FS Motor Oils are engineered to prevent turbo-induced coking and provide stable viscosity even when the engine is pushed to its limits.
The cooling system of the SL63 is equally vital. Whether using the pre-mixed AMSOIL Passenger Car & Light Truck Antifreeze & Coolant for the HTCC or the concentrated AMSOIL Propylene Glycol Antifreeze and Engine Coolant for the LTCC, these fluids are phosphate-, nitrate-, and nitrite-free, which protects the aluminum and copper components inside the radiator and engine block. The high heat output of the 5.5L biturbo requires a coolant that can withstand thermal breakdown, and the extended protection intervals of these fluids reduce the maintenance burden on the owner.
Transmission fluid is another area where synthetic superiority becomes apparent. The 7-speed 722.9 transmission in the SL63 operates under significant load and heat. The AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid and AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid are designed to resist oxidation and maintain their viscosity, ensuring crisp gear changes and protecting the clutch plates from slippage and wear. Using the correct fluid can prevent costly transmission repairs and maintain the vehicle’s performance characteristics over the long term.
AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid and AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid are often overlooked but are crucial for safety and control. The synthetic brake fluid resists moisture absorption and boiling, maintaining pedal feel and stopping power even after repeated hard braking. Similarly, the synthetic power steering fluid ensures that the steering remains precise and free from cavitation or seal degradation, which is essential for a grand tourer like the SL63.
About the Vehicle
The 2018 Mercedes-Benz SL63 AMG represents the culmination of decades of performance coupe engineering. Part of the R232 generation, this vehicle is a luxury grand tourer that seamlessly blends open-top driving pleasure with track-capable performance. At the heart of the machine is the legendary 5.5-liter M157 biturbo V8, an engine known for its smooth power delivery and immense torque. This powertrain produces over 577 horsepower and 664 lb-ft of torque, launching the car from zero to sixty in under four seconds while maintaining a level of refinement typically reserved for more modest vehicles.
Owners of the SL63 appreciate its dual nature. It is a comfortable cruiser capable of traversing continents in silence and luxury, yet it transforms into a performance weapon at the push of a button. The car features adaptive damping, rear-wheel steering, and a sophisticated all-wheel-drive system (depending on the specific market and option package) that ensures stability at high speeds and in adverse weather. The interior is a showcase of craftsmanship, with high-quality leather, carbon fiber accents, and the latest MBUX infotainment systems, creating a cockpit that feels both futuristic and timeless.
Despite its reliability reputation, the SL63 is not without its maintenance requirements, particularly given the stress placed on its components. One common issue owners may face is the accumulation of sludge and carbon deposits in the engine, particularly if the vehicle is subjected to frequent short trips or spirited driving that doesn’t allow the oil to fully reach operating temperature and clean the internals. AMSOIL synthetic oils are formulated to resist oxidation and thermal breakdown, which helps keep the engine internals cleaner for longer and reduces the risk of sludge buildup that can restrict oil flow to critical components like the turbocharger bearings.
Another potential challenge for the SL63 involves the high-temperature demands placed on the transmission. The torque generated by the V8 puts significant strain on the clutch packs within the 7-speed automatic. Over time, standard transmission fluids may degrade, leading to shuddering or harsh shifts. Regular fluid changes with a high-quality synthetic fluid like the AMSOIL Signature Series can help mitigate these issues by maintaining viscosity and preventing friction modifier depletion, thereby preserving the transmission’s smooth operation.
The cooling system also faces unique challenges due to the high-output engine. Over time, coolant can lose its corrosion-inhibiting properties, leading to premature wear on the water pump, radiator, and thermostat housing. Using an extended-life coolant helps protect these metal and rubber components from corrosion and scaling, ensuring the cooling system remains efficient. Additionally, the braking system on a vehicle of this caliber requires consistent performance; AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid is essential for maintaining a high boiling point to prevent fade during track days or aggressive driving.
Finally, the vehicle’s age and mileage can lead to seal drying and minor leaks, a common concern for any high-mileage performance vehicle. The synthetic nature of the recommended AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid helps keep seals pliable, reducing the likelihood of leaks and ensuring the steering remains responsive and quiet. By adhering to a rigorous maintenance schedule with top-tier synthetic lubricants, SL63 owners can preserve the performance and luxury character of this iconic automobile for years to come.