The 2021 Mercedes-Benz GLS580 is a flagship luxury SUV that demands the highest quality of maintenance to ensure its complex engine and systems perform as intended. Powered by a 4.0-liter twin-turbo V8, this vehicle represents the pinnacle of modern engineering, combining massive power with refined comfort. Because the GLS580 operates under significant thermal and mechanical stress, especially given its size and performance capabilities, using the correct fluids is not just a recommendation but a necessity for longevity. Standard mineral oils and generic coolants often cannot meet the rigorous standards required by German manufacturers, potentially leading to premature wear, sludge buildup, or cooling system failures. AMSOIL synthetic lubricants are engineered to exceed these OEM requirements, providing superior protection against the extreme conditions this SUV encounters.
Recommended AMSOIL Products
- AMSOIL 0W-30 MS 100% Synthetic European Motor Oil – Specifically formulated for the unique demands of gasoline, diesel, and hybrid European vehicles, offering precise blending of synthetic base oils and premium additives to handle the high loads of the 4.0L turbo V8.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A unique poly-organic acid (OAT) formulation that protects cooling system metals, gaskets, and hoses for up to 150,000 miles or 5 years, ideal for the GLS580’s cooling needs.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated option that requires mixing with distilled water, offering extended protection up to 1,000,000 miles in heavy-duty applications and greatly surpassing standards for corrosion protection.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Provides excellent ABS and traction-control responsiveness with stable viscosity over a wide temperature range, meeting the strict MB Sheet 331.0 standards.
Keeping the engine of your 2021 GLS580 clean and lubricated is the first line of defense against the harsh conditions created by twin-turbo technology. The engine oil specification for this vehicle is critical, with a recommended viscosity of 0W-30 or 0W-40 for all temperatures, or 5W-30 and 5W-40 for conditions above -25°C. The total capacity for an oil change, including the filter, is 10 quarts. Using a high-quality synthetic motor oil like the 0W-30 MS helps manage heat and reduces the risk of oil coking, a common issue in turbocharged engines where oil can harden and leave deposits in hot zones. It is important to replace the drain plug seal during every service, and the drain plug should be torqued to 15 ft/lbs on metal plugs. After refilling, always check the oil level to ensure the vehicle is properly lubricated.
While engine oil gets the most attention, the cooling system plays an equally vital role in the health of the GLS580. The vehicle requires a specific antifreeze concentration to prevent overheating and corrosion within the complex cooling passages. Depending on the type used, the capacity for the Low Temperature AMSOIL Passenger Car & Light Truck Antifreeze & Coolant (LTCC) is 5.3 quarts, while the High Temperature AMSOIL Propylene Glycol Antifreeze and Engine Coolant (HTCC) requires 16.6 quarts. AMSOIL offers both ready-to-use pre-mixes and concentrated options. The pre-mix is an ethylene glycol formulation that provides protection up to 150,000 miles or five years, covering a wide variety of metals and rubber components without the need for mixing. For those who prefer a concentrated solution, the propylene glycol AMSOIL Propylene Glycol Antifreeze and Engine Coolant offers extended service intervals and a longer lifespan, particularly beneficial for owners who engage in severe driving conditions or extended towing. Both options are free from phosphates, nitrates, and silicates, ensuring compatibility with all cooling system components.
The braking system in a vehicle as heavy and fast as the GLS580 must remain consistent and responsive under all conditions. Standard brake fluids can absorb moisture over time, leading to a lower boiling point and potential brake fade. The 2021 GLS580 requires AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid that meets or exceeds the MB Sheet 331.0 standard, often designated as DOT 4 plus. AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid is an excellent choice, offering superior stability and maintaining a stable viscosity across a wide temperature spectrum. This ensures that the ABS and traction control systems receive fluid that performs reliably during emergency stops or aggressive cornering, preventing the spongy pedal feel associated with degraded fluid.
About the Vehicle
The 2021 Mercedes-Benz GLS580 is the top-tier luxury SUV in the brand’s lineup, often referred to as the “S-Class of SUVs.” It sits atop the GLS family, sharing its platform with the Mercedes GLE but in a much more spacious, three-row configuration designed for ultimate passenger comfort. Under the hood lies the robust 4.0-liter V8 biturbo engine, code 176.980.7, which delivers a powerful blend of performance and refinement. This engine is known for its smooth power delivery and advanced cylinder deactivation technology, allowing for V4 mode during light cruising to improve fuel efficiency. The GLS580 combines this high-performance mechanicals with an air suspension system that provides a magical ride, isolating occupants from road imperfections while maintaining confident handling characteristics.
Owners of the GLS580 often choose this vehicle for its versatility, as it bridges the gap between a pure luxury sedan and a rugged off-roader. It is capable of towing substantial loads, making it a favorite for families who need to haul boats, campers, or trailers. However, this capability comes with higher stress on the drivetrain and engine. While the GLS580 is a marvel of engineering, like any modern vehicle with complex electronics and tight tolerances, it can face specific issues over time. One common challenge is the potential for carbon buildup in the intake ports and valves, a frequent occurrence in direct-injection gasoline engines. The high temperatures and direct injection nature of the 4.0L V8 can lead to deposits that reduce efficiency and power. Regular use of high-quality motor oil and gasoline additives like AMSOIL P.i. Performance Improver can help mitigate this buildup.
Another area where owners report issues is the sensitivity of the air suspension system. Over time, the air bags can develop small leaks or the compressors can work harder than usual to maintain ride height, especially as the vehicle ages. This added strain on the electrical and pneumatic systems can be exacerbated by moisture ingress or electrical corrosion. Maintaining the integrity of the vehicle’s seals and using protective coatings like AMSOIL Heavy-Duty Metal Protector can help preserve the suspension’s longevity. Furthermore, turbocharged engines place significant thermal stress on components. The heat soak from the turbos can sometimes lead to premature wear of oil seals or gaskets if the oil does not maintain its integrity under extreme heat. Using a synthetic oil with superior thermal stability helps ensure that the oil film remains strong even when the engine is operating at its peak temperature.
Finally, the brake system is a critical component that requires diligent maintenance. The sheer weight of the GLS580 means the brakes work harder than on lighter vehicles, leading to faster wear of brake pads and rotors. The AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid, in particular, can become contaminated with moisture, which lowers the boiling point and can cause corrosion in the calipers and ABS modules. Ensuring the brake fluid is replaced with a high-performance synthetic alternative like the DOT 3/DOT 4 blend can prevent moisture absorption and keep the braking system responsive. By addressing these common pain points with premium lubricants and additives, owners can extend the life of their GLS580 and maintain the vehicle’s premium performance for years to come. Regular maintenance with the right fluids is the key to unlocking the full potential of this sophisticated machine.
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