The 2021 Mercedes-Benz GLS63 AMG is a powerhouse in the full-size luxury SUV segment, combining opulent comfort with serious performance credentials. Under the hood lies the 4.0-liter twin-turbocharged V8 engine, a high-performance unit that demands superior lubrication to operate smoothly under extreme stress. For owners who expect the best from their investment, using standard factory-fill oils may not be sufficient to protect the engine’s complex turbocharging system, high-pressure injection systems, and precision tolerances over the long term. Proper lubrication is the backbone of reliability for this machine, ensuring that critical components remain clean, cool, and protected against the harsh conditions of both stop-and-go traffic and high-speed driving.
Recommended AMSOIL Products
For the 2021 Mercedes-Benz GLS63 AMG, AMSOIL provides specialized synthetic lubricants designed to exceed the rigorous demands of European performance vehicles. Below are the recommended fluids and additives that address the specific needs of the 4.0L V8 engine and its associated systems.
- AMSOIL 5W-40 FS 100% Synthetic European Motor Oil – This premium synthetic oil is specifically engineered for the unique demands of gasoline, diesel, and hybrid European vehicles. It features a precise blend of synthetic base oils and premium additives to handle the high temperatures and stress of the AMG turbocharger.
- AMSOIL 0W-40 FS 100% Synthetic European Motor Oil – Offering superior cold-weather protection while maintaining optimal viscosity at operating temperatures, this oil ensures immediate flow and protection upon startup, crucial for high-performance engines.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A unique poly-organic acid (OAT) formulation that protects the cooling system metals, gaskets, and hoses for up to 150,000 miles. This pre-mix formulation is compatible with all other antifreeze colors and provides robust protection against freezing and boiling.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Designed to provide excellent ABS and traction-control responsiveness, this fluid maintains stable viscosity over a wide temperature range, ensuring consistent braking performance when the vehicle is put to the test.
- AMSOIL P.i.® Performance Improver Gasoline Additive – This powerful additive restores up to 14% horsepower and cleans fuel injectors to 100% flow rate after a single tank of fuel. It is particularly beneficial for GDI engines, helping to prevent carbon buildup and improve overall engine efficiency.
When performing maintenance on the GLS63 AMG, understanding the specific fluid capacities and requirements is essential for a successful service. The engine oil system, including the filter change, requires a capacity of 10 quarts. After refilling, it is critical to check the oil level to ensure proper lubrication. When replacing the oil drain plug, the torque specifications vary by material: 3 ft/lbs for a plastic plug and 15 ft/lbs for a metal plug. Always replace the seal during this process to prevent leaks.
The cooling system also requires attention, with capacities varying based on the type of coolant system. The Low Temp Coolant Capacity (LTCC) is 5.3 quarts, while the High Temp Coolant Capacity (HTCC) is 16.6 quarts. Owners should choose between the ready-to-use pre-mix or the concentrated propylene glycol option depending on their preference and application. The brake fluid system recommends DOT 4 Plus or products approved on MB Sheet 331.0, making the synthetic AMSOIL brake fluid an ideal choice for maintaining peak braking performance.
While the source documentation indicates that there are no specific oil filter, transmission fluid, or differential lubricant recommendations available at this time for this specific configuration, the engine oil remains the most critical component. The use of AMSOIL European synthetic motor oils ensures that the engine remains clean and protected from sludge formation, which can be a concern in high-mileage performance vehicles. By extending the intervals between oil changes, owners can reduce maintenance costs while keeping the engine running smoother for longer periods.
About the 2021 Mercedes-Benz GLS63 AMG
The 2021 Mercedes-Benz GLS63 AMG is a formidable presence on the road, representing the pinnacle of the luxury SUV market. Based on the X166 platform, which was produced from 2016 to 2019 and updated for subsequent model years, the GLS class serves as Mercedes-Benz’s flagship SUV, offering a commanding driving position and interior space that rivals the S-Class sedan. The GLS63 AMG trim, however, elevates this already impressive vehicle to supercar territory, blending the utility of a large family hauler with the raw performance of a sports car.
At the heart of this beast is the 4.0-liter biturbo V8 engine, codified as the 177.980. This powerplant delivers an impressive output of horsepower and torque, allowing the nearly six-thousand-pound SUV to accelerate from zero to sixty miles per hour in a matter of seconds that would shame many sports cars. The engine is known for its responsiveness and smooth power delivery, thanks in part to the M278 or M177 family engineering, which features twin-scroll turbos and a 53-degree V-angle for better packaging and reduced weight. The engine’s architecture allows for exceptional efficiency relative to its power output, making it a marvel of modern engineering.
Drivers often select the GLS63 AMG for its versatility. It is equally capable on the Autobahn, in city traffic, and when towing heavy loads or hauling passengers and gear for outdoor adventures. The interior is a sanctuary of luxury, featuring high-quality leather, advanced infotainment systems, and a host of driver-assist technologies that make the driving experience less stressful. Despite its size, the vehicle handles surprisingly well, aided by adaptive air suspension and all-wheel drive capabilities.
However, the high-performance nature of the GLS63 AMG introduces specific challenges that owners must be aware of. The intense heat generated by the twin-turbo V8 during track driving or towing can degrade standard oils rapidly, leading to increased wear on bearings and turbocharger components. Additionally, the direct injection system common in these modern engines can suffer from carbon buildup on intake valves, which reduces efficiency and power over time. Frequent stop-and-go driving can also lead to oil sludge formation if the oil is not of sufficient quality to resist oxidation and thermal breakdown.
Another known area of concern for high-mileage owners is the potential for coolant system degradation. The complex cooling requirements of a twin-turbo engine mean that the coolant must provide superior protection against corrosion and boiling. If the coolant is not changed regularly or is of poor quality, it can lead to overheating or blockages in the radiator and heater core. Furthermore, the braking system on a vehicle with this much mass and speed potential requires fluid that does not absorb moisture easily, as water content in brake fluid can lead to vapor lock and reduced braking performance. AMSOIL’s specialized fluids address these specific pain points, offering solutions to maintain the vehicle’s performance and longevity.
Ultimately, the GLS63 AMG is a vehicle that demands respect and proper care. By utilizing synthetic lubricants designed for European specifications, owners can ensure that the engine remains clean, the cooling system stays robust, and the braking system performs reliably. This proactive approach to maintenance not only preserves the vehicle’s high resale value but also ensures that every mile driven is a safe and enjoyable experience.