For the 2023 GLS63 AMG, AMSOIL offers premium synthetic lubricants formulated to protect the 4.0L 8-cylinder engine (Engine Code 177.980 8 Turbo) in any driving condition. Whether you are enduring extreme heat, towing, or extending service intervals, these products provide superior protection.
- AMSOIL 5W-40 FS 100% Synthetic European Motor Oil – Designed specifically for gasoline, diesel, and hybrid European vehicles, this oil features a precise blend of synthetic base oils and premium additives to meet European specifications, ideal for temperatures above -25°C.
- AMSOIL 0W-40 FS 100% Synthetic European Motor Oil – Another top-tier European formula designed for the unique demands of high-performance engines, offering exceptional flow at startup and stability at high temperatures for all conditions.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – An ethylene glycol 50/50 pre-mix formulation that protects the cooling system metals, gaskets, and hoses, offering up to 150,000 miles or 5 years of protection while being free of phosphates and nitrates.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated formulation that requires mixing with distilled water, providing superior protection against corrosion and erosion in both passenger cars and heavy-duty applications for up to 150,000 miles.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Provides excellent ABS and traction-control responsiveness with a stable viscosity over a wide temperature range, making it an ideal replacement for the DOT 4 plus requirements found in this vehicle.
Engine Oil and Service Specifications
The heart of the 2023 GLS63 AMG is the 4.0-liter V8 engine, which relies on precise lubrication to handle the immense heat and pressure generated by its twin turbochargers. The manufacturer recommends a viscosity grade that can adapt to varying climate conditions while maintaining protective film strength. For this vehicle, the engine oil capacity is 10 quarts when including a filter change. It is critical to refill the system with the correct amount of fluid and to check the oil level after the refill process to ensure optimal levels.
The oil drain plug torque requirements are specific and must be adhered to during maintenance to prevent leaks or stripped threads. When reinstalling a metal drain plug, the torque specification is 15 foot-pounds. If the vehicle is equipped with a plastic drain plug, the torque specification is significantly lower at 3 foot-pounds. Always replace the drain plug seal upon every oil change to ensure a leak-free seal. Choosing between AMSOIL 5W-40 or AMSOIL 0W-40 allows owners to select the best fit for their local climate; the 0W-40 option is suitable for all temperatures, while the 5W-40 is ideal for environments above -25°C.
While the source data indicates that no specific oil filter recommendations are available in the fitment guide, using AMSOIL’s high-efficiency filtration system remains a core component of any maintenance strategy. The oils listed above are engineered to work in concert with high-quality filters to remove contaminants and keep the engine clean, preventing the carbon buildup that can plague direct injection and turbocharged engines.
Cooling System and Thermal Management
Effective heat transfer is vital for the longevity of the GLS63 AMG’s powertrain. The cooling system for this model has distinct capacities depending on the specific configuration or fill method. The Liquid Temperature Control Antifreeze & Coolant (LTCC) capacity is 5.3 quarts, while the High Temperature Cooling Circuit (HTCC) capacity is 16.6 quarts. Using the correct antifreeze ensures that the system remains free of rust, scale, and corrosion, which can degrade over time in aluminum-heavy European engines.
The AMSOIL Passenger Car & Light Truck Antifreeze & Coolant is a pre-mixed solution that eliminates the risk of improper mixing ratios, ensuring immediate protection. For owners who prefer to mix their own solution, the Propylene Glycol Antifreeze offers a concentrated option. This product is phosphate-, nitrate-, nitrite-, silicate-, and borate-free, meaning it is compatible with all other antifreeze colors and does not harm cooling system components. It provides protection for up to 150,000 miles or 5 years, significantly extending the interval between coolant flushes.
Brake Fluid and Safety Systems
The braking system on a high-performance SUV like the GLS63 AMG faces unique challenges, including repeated hard stops and exposure to high heat. The manufacturer recommends a DOT 4 plus fluid (Mercedes-Benz Part Number 0009895605090109 or equivalent products approved on MB Sheet 331.0) for optimal performance. AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid meets these stringent requirements while offering superior boiling points and viscosity stability.
Regularly replacing brake fluid is essential because hygroscopic fluids absorb moisture over time, which can lower the boiling point and lead to brake fade under severe driving conditions. The AMSOIL fluid ensures excellent responsiveness from the ABS and traction control systems, maintaining pedal feel and safety even after years of service. This synthetic fluid also protects against the corrosion of aluminum wheels and steel brake lines, extending the life of the braking components.
Additional Protection and Seasonal Storage
For owners who store their vehicle or drive it infrequently during colder months, preserving the engine and fuel system is crucial. AMSOIL Gasoline Stabilizer helps keep fuel fresh for up to 12 months, protecting against varnish and gum buildup caused by ethanol corrosion. This is ideal for seasonal equipment or vehicles that sit idle for extended periods. Additionally, AMSOIL Engine Fogging Oil can be used to coat internal engine components, preventing rust during long-term storage or periods of inactivity.
For those looking to improve fuel economy and engine performance, AMSOIL P.i. Performance Improver acts as a gasoline additive that restores up to 14% horsepower by cleaning GDI fuel injectors to 100% flow rate. It also helps prevent pre-ignition knock and is compatible with capless fuel systems. For exterior protection, the AMSOIL Miracle Wash Waterless Wash and Wax Spray offers a quick cleaning solution that repels dust and protects against UV rays without the need for water or soap.
About the Vehicle: 2023 Mercedes-Benz GLS63 AMG
The 2023 Mercedes-Benz GLS63 AMG stands as a formidable force in the luxury SUV segment, blending the practicality of a three-row family hauler with the raw performance of a high-end sports car. Based on the W167 platform, this model is engineered to deliver a driving experience that is both comfortable and exhilarating. The GLS63 is the performance flagship of the GLS lineup, positioned above the standard GLS 580 and GLS 450 models, offering a driving character that is distinctly more aggressive and responsive.
Under the hood lies the M177 4.0-liter twin-turbocharged V8 engine, a powerhouse that generates significant horsepower and torque figures. While specific output can vary by market and tuning, the engine is renowned for its smooth power delivery and rapid acceleration, allowing the heavy SUV to rival many sports sedans. The GLS63 features AMG’s proprietary 4MATIC+ all-wheel-drive system, which sends power to all four wheels for superior traction but can be programmed to bias power to the rear axle for a more rear-wheel-drive feel when cornering.
Inside, the cabin is a showcase of Mercedes-Benz luxury, utilizing high-end materials such as Nappa leather, wood trim, and advanced MBUX technology. The vehicle seats up to seven passengers, offering a versatile layout that makes it a favorite for families who demand high performance. The GLS63 also features an air suspension system that adapts to road conditions, providing a smooth ride despite its large wheels and low-profile tires. This combination of everyday usability and track-ready capability has solidified its reputation as one of the most capable luxury performance SUVs in the world, appealing to drivers who refuse to compromise between utility and speed.