Maintaining the high-performance potential of your 2021 Mercedes-Benz GLC63 AMG S requires more than just regular service; it demands fluids specifically engineered for its demanding 4.0L twin-turbo V8. This vehicle operates under extreme thermal and mechanical stress, particularly when the turbochargers are spooling or when navigating tight corners with aggressive handling. Using the correct lubricants ensures that critical components remain protected against wear, sludge, and varnish buildup, extending the life of the engine and transmission while preserving the vehicle’s responsive driving characteristics.
Recommended AMSOIL Products
- AMSOIL 5W-40 FS 100% Synthetic European Motor Oil – Designed for the unique demands of European gasoline and hybrid vehicles, this oil features a precise blend of synthetic base oils and premium additives to handle extreme temperatures.
- AMSOIL 0W-40 FS 100% Synthetic European Motor Oil – Ideal for colder climates, this fluid ensures rapid circulation and protection for the AMG engine during cold starts while maintaining high-temperature stability.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A unique poly-organic acid formulation that provides corrosion protection for all cooling system metals, gaskets, and hoses for up to 150,000 miles.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated formula requiring mixing, offering superior protection against corrosion and erosion that greatly surpasses standard OEM requirements.
- 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 for reserve protection during abuse.
- AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Provides essential protection against wear and ensures reliable shift performance in severe driving conditions.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Offers excellent ABS and traction-control responsiveness with stable viscosity over a wide temperature range, meeting or exceeding MB Sheet 331.0 standards.
Engine Oil and Filter Specifications
The 2021 Mercedes-Benz GLC63 AMG S is powered by the 4.0L 8-cylinder engine, identified by the engine code 177.980 0 Turbo. This high-output powerplant places significant stress on lubricants due to high operating temperatures and boost pressure. For optimal protection, AMSOIL recommends either the 5W-40 FS 100% Synthetic European Motor Oil or the 0W-40 FS 100% Synthetic European Motor Oil. These formulations are tailored to meet the strict requirements of European manufacturers, ensuring compatibility with the vehicle’s complex engine components.
The total oil capacity for this vehicle is 9.5 quarts when including a filter change. After refilling, it is crucial to check the oil level to ensure accuracy. When performing a service, note the torque specifications for the oil drain plug: use 3 ft/lbs for plastic plugs and 22 ft/lbs for metal plugs. Additionally, you should replace the drain plug seal to prevent leaks. While specific oil filter recommendations for this model are not currently available in the database, maintaining a tight seal and clean flow path is essential for the longevity of the turbocharged engine.
Transmission and Differential Lubrication
The automatic transmission in the GLC63 AMG S operates under intense load, especially when accelerating from a standstill or towing. AMSOIL offers two primary options for transmission fluid: the Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid and the OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid. Both fluids are designed to protect against wear and thermal breakdown, ensuring smooth shifting and prolonged transmission life.
For the differential and transfer case, fluid capacities vary depending on the specific configuration. The rear differential holds 2.5 pints, while the front differential holds 1.3 pints. For the transfer case, if equipped, the capacity is 1.5 pints. When servicing the transfer case, ensure the fill plug is torqued to 10 ft/lbs and the drain plug to 18 ft/lbs. AMSOIL products for these differentials provide the necessary protection against the shear forces generated by all-wheel-drive systems.
Cooling System and Brake Fluid
Maintaining the cooling system is vital for a twin-turbocharged engine, as overheating can quickly lead to catastrophic failure. The vehicle’s cooling system holds varying amounts of fluid depending on the configuration: 4.9 quarts for the LTCC4.9 system and 11.7 quarts for the HTCC11.7 system. The AMSOIL Passenger Car & Light Truck Antifreeze & Coolant or the Propylene Glycol Antifreeze are recommended. Both options offer extended service intervals up to 150,000 miles or 5 years and are free from phosphates, nitrates, nitrites, silicates, borates, and amines, which protects all metals and gaskets.
Brake fluid performance is critical for a vehicle with the handling capabilities of the GLC63 AMG S. The manufacturer specifies the use of DOT 4 plus fluid, specifically meeting Mercedes-Benz Sheet 331.0 standards (part numbers 0009895605090109, 0009895605110111, or 000989080701). The AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid meets these requirements, providing a stable viscosity range that ensures consistent pedal feel and ABS responsiveness, even in extreme temperature fluctuations.
About the Vehicle
The 2021 Mercedes-Benz GLC63 AMG S represents the pinnacle of performance-oriented compact SUVs, blending the practicality of a crossover with the raw power of a high-performance sports sedan. Under the hood lies the legendary M177 4.0-liter V8 twin-turbo engine, a piece of engineering designed to deliver aggressive acceleration and thrilling driving dynamics. This engine code, 177.980 0, signifies the latest iteration of Mercedes-AMG’s modular engine family, which utilizes flat-plane crank technology in some variants to reduce internal weight and increase throttle response.
Owners of the GLC63 AMG S often describe the vehicle as a “wolf in sheep’s clothing,” capable of seating five passengers comfortably while delivering performance figures that rival dedicated supercars. The “S” model designation indicates the top-tier version of the AMG lineup, featuring a high-output engine with approximately 503 horsepower and the ability to launch from 0 to 60 mph in under 3.5 seconds. The chassis is stiffened and the suspension tuned to handle this immense power, providing a driving character that is both precise and commanding on the track or the open road.
Despite its robust engineering, the GLC63 AMG S can present specific maintenance challenges common to high-performance AMG vehicles. One notable issue is the potential for turbocharger wear due to the extreme thermal cycling these engines undergo. The turbochargers operate at incredibly high speeds and temperatures, and oil breakdown can lead to sludge accumulation in the oil feed lines or bearing failure. Using a high-quality synthetic oil that resists thermal breakdown and keeps the engine clean is the best defense against premature turbo failure.
Another common concern for owners of these AMG models is oil consumption. The complex geometry of the cylinder walls and piston rings, combined with the high stresses of the turbo system, can sometimes lead to increased oil consumption over time. AMSOIL’s European formula motor oils are specifically engineered with seal conditioners and viscosity stabilizers that help maintain oil pressure and reduce consumption, ensuring the engine runs smoothly for longer periods between top-offs. Additionally, the cooling system can be susceptible to corrosion or degradation, especially if standard coolants are used for too long. The specialized antifreeze formulations for these vehicles prevent corrosion in the aluminum components and gaskets, which are critical for the cooling of the hot engine block.
Furthermore, the all-wheel-drive system in the GLC63 AMG S is a sophisticated engineering marvel, but it places unique demands on the differential fluids. The constant torque distribution and the ability to send power to individual wheels can cause rapid breakdown of standard gear oils. Without proper lubrication, the differential gears and bearings can suffer from excessive wear or noise. Premium synthetic differential fluids provide the necessary extreme pressure protection and shear stability to keep the drivetrain operating silently and efficiently, preventing the clunks and whines that can plague these systems over time. By addressing these specific wear points, owners can maintain the vehicle’s legendary performance and reliability for years to come.
Additional Maintenance and Care
To ensure your 2021 GLC63 AMG S remains in top condition, regular maintenance extends beyond just engine oil. Fuel system health is paramount for maintaining power and efficiency. The AMSOIL P.i. Performance Improver can help restore up to 14% horsepower and clean GDI fuel injectors to 100% flow rate, ensuring the turbocharged engine receives a clean fuel supply. For vehicles that may be stored for periods, the AMSOIL Gasoline Stabilizer keeps fuel fresh for up to 12 months, preventing varnish and gum buildup that can clog injectors.
For those looking to protect their vehicle during long storage periods, the AMSOIL Engine Fogging Oil provides a highly effective rust preventive coating for internal engine components. Whether you are storing the vehicle for winter or preparing it for a long trip, these additives ensure that when you start the engine, it runs smoothly without internal corrosion. Regular cleaning with AMSOIL Engine Degreaser can also keep the engine bay spotless, removing stubborn grease and grime that can trap heat or cause corrosion on electrical connectors.
Finally, for the exterior and interior of your vehicle, a range of detailing products can help maintain its pristine appearance. From the AMSOIL Miracle Wash Waterless Wash and Wax Spray that protects against UV rays to the specialized Interior Detailers that trap odors, keeping the GLC63 AMG S looking as good as it drives is essential for any enthusiast. By utilizing the full spectrum of AMSOIL products, you are investing in the comprehensive care of your vehicle, ensuring that every component, from the engine block to the brake calipers, receives the highest level of protection available.