Maintaining the performance and longevity of your 2012 Mercedes-Benz GL550 requires a meticulous approach to lubrication. This luxury SUV, powered by the robust 5.5L V8 engine (Engine Code 273.963 8), places specific demands on its lubricants. Using standard off-the-shelf oils can lead to premature wear, especially given the high output of this powerplant. AMSOIL synthetic lubricants are formulated to exceed the rigorous specifications required for European engineering, providing superior protection against the extreme temperatures and high-stress driving conditions these vehicles often encounter.
Recommended AMSOIL Products
For the 2012 Mercedes-Benz GL550, selecting the right viscosity and specification is critical for engine health. The source data indicates two primary AMSOIL motor oil options that cater to different temperature preferences and driving styles. Additionally, the engine capacity is substantial, requiring 9.5 quarts of fluid when a filter change is included. To ensure complete filtration, several high-quality oil filter options are available, including the AMSOIL proprietary filter, as well as premium aftermarket choices from WIX and MANN-FILTERS.
- AMSOIL 5W-40 FS 100% Synthetic European Motor Oil – Specifically engineered for the precise tolerances of European vehicles, offering exceptional protection against high temperatures and wear for both gasoline and diesel applications.
- AMSOIL 0W-40 FS 100% Synthetic European Motor Oil – A high-performance synthetic option designed for superior cold-weather starting and immediate flow, ideal for the demanding requirements of the GL550 engine.
- AMSOIL Oil Filter – Provides 99% filtration efficiency at 20 microns with greater capacity for contaminants than competing filters to help reduce engine wear.
- WIX Oil Filter – Features premium media that offers improvements over original equipment manufacturer-branded filters for enhanced flow and dirt holding capacity.
- MANN-FILTERS Oil Filter – A premium media option that provides reliable filtration performance tailored for high-demand engines.
- MANN-FILTERS Air Filters – Ensures optimal airflow to the engine while capturing fine particulates to protect internal components from abrasive wear.
- 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.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated antifreeze option that greatly surpasses standards for metallic corrosion and erosion, requiring mixing with water for maximum protection.
- AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Withstands the rigors of heavy towing, elevated temperatures, and challenging terrain while remaining fluid in sub-zero conditions.
- AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – A cost-effective synthetic solution that protects against wear and provides reliable performance for automatic transmissions.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Delivers excellent ABS and traction-control responsiveness with stable viscosity across a wide temperature range.
- AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid – Resists heat for long fluid life and helps seals remain soft to prevent leaks while ensuring quiet operation.
- AMSOIL Gasoline Stabilizer – Keeps fuel fresh for up to 12 months and protects against varnish and gum buildup, ideal for seasonal storage of the GL550.
- AMSOIL P.i.® Performance Improver Gasoline Additive – Restores up to 14% horsepower and cleans GDI fuel injectors to 100% flow rate, improving fuel economy and reducing the need for higher-octane fuel.
The engine lubrication specifications for the 2012 GL550 are precise. The recommended oil grade is SEO30, which covers viscosities of 0W-30, 0W-40, 5W-30, and 5W-40 depending on ambient temperatures. For standard operation above -25°C, the 5W-40 or 0W-40 options provide optimal film strength. The total oil capacity, including the filter replacement, is 9.5 quarts. It is crucial to check the oil level after the refill to ensure accuracy. Additionally, the oil drain plug requires a torque specification of 22 ft/lbs to prevent leaks or damage to the aluminum pan.
For the cooling system, the vehicle holds 12.7 quarts of antifreeze. AMSOIL offers both a 50/50 pre-mix formulation and a concentrated version. The pre-mix version contains unique poly-organic acid technology that protects all metals, gaskets, and hoses while being free of phosphates, nitrates, and silicates that can cause scaling. The concentrated version allows for mixing with distilled water and offers protection for up to 150,000 miles or 5 years, making it an excellent choice for long-term maintenance.
The transmission on the 2012 GL550 utilizes an automatic system, specifically the 722.9 series. Depending on the data card code (SL057 or SL058), the total fill capacity for a 7-speed transmission is 9.5 quarts. AMSOIL recommends two distinct transmission fluids to address the specific needs of this gearbox. The Signature Series Fuel-Efficient version is designed to withstand heavy towing and high temperatures while maintaining fluidity in sub-zero conditions. For those seeking a fuel-efficient option that meets OE standards, the OE Fuel-Efficient 100% Synthetic fluid provides excellent wear protection and is a suitable alternative.
Other Fluids and Maintenance
Beyond the engine and transmission, maintaining the braking and steering systems is vital for safety. The GL550 requires DOT 4 plus brake fluid or products approved on MB Sheet 331.0. The AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid meets these requirements, offering stable viscosity over a wide temperature range and ensuring excellent responsiveness for ABS and traction control systems. For the power steering system, the vehicle uses a multi-vehicle synthetic fluid that resists heat and helps seals remain soft to prevent leaks. This fluid, AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid, also offers strong anti-wear protection and performs well in extreme temperatures for quiet operation.
Seasonal storage preparation is essential for owners who do not drive their GL550 year-round. Adding AMSOIL Gasoline Stabilizer to the fuel tank helps keep the gasoline fresh for up to 12 months, fighting ethanol corrosion and preventing varnish buildup. For added protection during long periods of inactivity, AMSOIL Engine Fogging Oil is highly effective. This rust preventive is designed to protect internal engine components, ensuring that the vehicle starts smoothly and runs efficiently when brought back into service.
Vehicle Background
The 2012 Mercedes-Benz GL-Class, specifically the GL550 model, represents a significant evolution in the luxury SUV segment. Introduced to replace the ML-Class as the brand’s flagship full-size SUV, the GL550 was designed to offer the utility of a large vehicle with the refinement and performance expected from Mercedes-Benz. It sits on a robust platform derived from the G-Class but is tuned for on-road comfort rather than off-road ruggedness, featuring a sophisticated suspension system that balances handling with a smooth ride quality.
Under the hood, the 2012 GL550 is powered by the M273 5.5L V8 engine. This naturally aspirated powerhouse is known for its smooth power delivery and impressive torque, allowing the heavy SUV to accelerate with surprising agility. The 5.5-liter displacement, combined with direct injection and variable valve timing, provides a balance of performance and efficiency that was advanced for its time. The interior of the GL550 typically accommodates up to seven passengers, with a focus on premium materials, leather upholstery, and advanced technology features that were state-of-the-art in the early 2010s.
Owners of the GL550 often appreciate its dual nature as both a capable hauler and a comfortable cruiser. It is well-suited for long road trips, family vacations, and navigating city streets with ease. However, the complexity of the vehicle’s systems, including its air suspension and advanced transmission, makes regular maintenance with high-quality fluids imperative. Proper lubrication ensures that the engine runs quietly, the transmission shifts smoothly, and the suspension components last for the long haul. By adhering to strict fluid specifications and using premium synthetic lubricants, owners can preserve the value and performance of this distinctive luxury vehicle for years to come.
Whether you are performing an oil change, flushing the cooling system, or refreshing the brake fluid, using the correct AMSOIL products ensures that your GL550 receives the protection it needs. The combination of synthetic motor oil, high-efficiency filters, and durable transmission fluid creates a comprehensive maintenance strategy that goes beyond standard manufacturer recommendations. This proactive approach helps prevent costly repairs and keeps your vehicle operating at its peak efficiency, regardless of the driving conditions you encounter.