Maintaining the performance of your 2008 Mercedes Benz G500 with its 5.0L V8 engine requires more than just a routine check; it demands precise fluid selection to handle the unique stresses of a high-performance European luxury SUV. Proper lubrication ensures that the 8.5-quart capacity engine, the complex 722.6 transmission, and the heavy-duty transfer case and differentials operate smoothly, even under the vehicle’s demanding driving conditions. Using the correct AMSOIL synthetic fluids helps extend service intervals, protects against extreme temperatures, and preserves the vehicle’s original driving character.
Recommended AMSOIL Products
- AMSOIL 5W-40 FS 100% Synthetic European Motor Oil – A specialized synthetic blend designed specifically for the thermal and wear demands of European gasoline, diesel, and hybrid engines, providing optimal protection in the G500’s 5.0L V8.
- AMSOIL 0W-40 FS 100% Synthetic European Motor Oil – An alternative premium viscosity that offers excellent cold-start protection and high-temperature stability, ensuring the engine’s precision components remain lubricated in all weather conditions.
- AMSOIL Oil Filter – Engineered to filter out 99% of contaminants at 20 microns, this filter offers greater capacity for small wear-causing particles compared to competing brands, helping to reduce engine wear during extended intervals.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A phosphate- and nitrite-free, extended-life ethylene glycol formulation that protects the cooling system’s metals, gaskets, and hoses for up to 150,000 miles or 5 years.
- AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Provides superior protection for the 722.6 transmission against the rigors of heavy towing, elevated temperatures, and challenging terrain while remaining fluid in sub-zero conditions.
- AMSOIL SEVERE GEAR® 75W-90 100% Synthetic Gear Lube – Offers advanced wear protection and friction modifiers for the front and rear differentials, helping to control operating temperatures and prevent rust and corrosion in the 4WD system.
The 2008 Mercedes Benz G500 represents a unique blend of classic off-road capability and luxury sedan comfort. Powered by the robust M113 5.0L V8 engine, this SUV is engineered to handle demanding terrains while offering a smooth and refined ride for daily use. The G-Class platform is renowned for its permanent four-wheel-drive system, which distributes power effectively across uneven surfaces, ensuring traction in various weather conditions. Owners appreciate this vehicle for its durable build quality and the sheer confidence it inspires in challenging environments. The engine’s substantial displacement delivers ample torque, making it suitable for both highway cruising and rugged expeditions. Proper maintenance of the G500’s fluid systems is critical to sustaining this performance legacy.
Engine Oil and Filtration Specifications
For the 5.0L V8 engine (Engine Code 113.962 N), precision is paramount. The engine requires a specific fluid capacity of 8.5 quarts, including the filter change. After refilling, it is essential to check the oil level to ensure accuracy. The oil drain plug should be torqued to 22 ft/lbs to prevent leaks and ensure a secure fit. While the engine can operate with various viscosities, AMSOIL 5W-40 FS 100% Synthetic European Motor Oil is tailored to the specific metallurgy and tolerances of Mercedes-Benz engines. This fluid features a precise blend of synthetic base oils and premium additives that minimize friction and maximize engine cleanliness.
Oil filtration is equally critical for longevity. The AMSOIL Oil Filter (Code EA15K39-EA) is designed to provide filtering efficiency of 99 percent at 20 microns. This high-efficiency filtration reduces the restriction on oil flow, keeping engine parts lubricated and reducing wear caused by tiny contaminants. If a preferred alternative is required, the WIX Oil Filter (Code 57078-EA) and MANN-FILTERS Oil Filter (Code HU7185X-EA) also offer premium media that improves upon standard OEM filters. Additionally, the MANN-FILTERS Air Filters (Code C369832-EA) help maintain clean airflow to the engine, ensuring optimal combustion and performance.
Transmission and Drivetrain Fluids
The 2008 G500 is equipped with a 5-speed automatic transmission (722.6 series) that requires specific attention to fluid quality. A total fill capacity is 8.5 quarts. The transmission fluid is subjected to high heat and stress, particularly when towing or driving off-road. The AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid is formulated to withstand these conditions. It remains fluid in sub-zero temperatures while providing reserve protection during heavy use, ensuring smooth shifting and reduced wear on transmission components.
The differential and transfer case systems are integral to the G500’s legendary 4WD capabilities. The front differential requires 3 pints of lubricant, while the rear differential requires 3.8 pints. Both units utilize a GLS44 specification. For these applications, the AMSOIL SEVERE GEAR® 75W-90 100% Synthetic Gear Lube is the ideal choice. It contains friction modifiers suitable for limited-slip applications and helps control thermal runaway, which can occur during extended periods of off-road driving. This lube also provides excellent protection against rust and corrosion, extending the life of seals and gears.
Coolant and Brake Systems
Cooling is vital for the high-output V8 engine. The cooling system holds 12.7 quarts. Using the correct AMSOIL Propylene Glycol Antifreeze formulation protects the aluminum components and rubber hoses common in European vehicles. The AMSOIL Passenger Car & Light Truck Antifreeze & Coolant is a unique poly-organic acid (OAT) formulation that exceeds OEM requirements. It is compatible with all other antifreeze colors and is free of silicates, borates, and phosphates, ensuring a safe and effective cooling solution for up to 150,000 miles.
Brake fluid quality directly impacts safety. The G500 requires a DOT 4 plus specification, compatible with the MB Sheet 331.0 standard. The AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid provides excellent responsiveness for both ABS and traction control systems. It maintains stable viscosity over a wide temperature range, ensuring consistent brake pedal feel and performance in extreme conditions. Additionally, the power steering system benefits from the AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid, which resists heat, reduces friction, and helps keep seals soft to prevent leaks.
About the Vehicle
The 2008 Mercedes Benz G500 is a quintessential example of the G-Class legacy, combining rugged off-road durability with urban luxury. Built on a heavy-duty ladder frame, this vehicle is capable of handling extreme articulation and rough terrain, yet it offers a level of refinement that distinguishes it from other off-roaders. The 5.0L V8 engine delivers smooth power and exceptional torque, allowing the G500 to traverse difficult trails without sacrificing drivability on the highway. The vehicle’s permanent all-wheel-drive system ensures that power is distributed effectively to the wheels with the most traction, making it a reliable companion in various weather conditions. Owners often appreciate the G500 for its timeless design and the confidence it inspires, whether navigating city streets or embarking on a weekend adventure in the wilderness. The G-Class platform has a reputation for longevity, making proper fluid maintenance a crucial investment in the vehicle’s continued performance and reliability.