The 2016 Mercedes-Benz G550 is a robust full-size SUV that commands attention on and off the road. Its powerful 4.0L turbocharged V8 engine, paired with a sophisticated 7-speed automatic transmission, requires lubricants that can withstand significant thermal stress and mechanical load. Using the wrong fluids can lead to premature wear, reduced performance, and costly repairs. To ensure your G550 maintains its luxury feel and off-road capability, it is essential to select the correct AMSOIL 5W-40 FS and AMSOIL 0W-40 FS 100% Synthetic European Motor Oils, specifically designed for the unique demands of European vehicles.
Recommended AMSOIL Products
- AMSOIL 5W-40 FS 100% Synthetic European Motor Oil – Specifically formulated with a precise blend of synthetic base oils and premium additives to meet the strict standards of European gasoline and diesel engines. It offers superior protection in high-temperature conditions.
- AMSOIL 0W-40 FS 100% Synthetic European Motor Oil – An ideal choice for extreme cold weather starts while maintaining excellent high-temperature stability, ensuring your engine remains protected during every season.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A unique poly-organic acid (OAT) formulation that provides up to 150,000 miles or 5 years of protection. It is phosphate-free and compatible with all cooling system metals.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated formula that, when mixed with distilled water, offers exceptional freeze and boil-over protection, exceeding original equipment manufacturer requirements for longevity.
- AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Designed to withstand heavy towing, elevated temperatures, and challenging terrain, keeping the transmission fluid fluid even in sub-zero conditions.
- AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – A cost-effective option that provides reliable wear protection and fuel efficiency for your automatic transmission.
- AMSOIL SEVERE GEAR® 75W-90 100% Synthetic Gear Lube – Provides advanced protection against wear and thermal runaway for front and rear differentials, containing friction modifiers for limited-slip applications.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Delivers excellent responsiveness for ABS and traction control systems, ensuring a stable viscosity over a wide temperature range for maximum braking safety.
- AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid – Reduces friction and helps keep seals soft to prevent leaks, while offering strong anti-wear protection for quiet operation in various weather conditions.
Ensuring your 2016 Mercedes-Benz G550 receives the correct fluid maintenance is critical for its longevity and performance. The engine in this model, designated as the 176.980 N Turbo, operates under high stress due to the turbocharger and the vehicle’s substantial weight. AMSOIL 5W-40 FS and AMSOIL 0W-40 FS motor oils are engineered to handle the extreme temperatures generated by the engine and the turbo system. These oils offer extended drain intervals and superior engine cleanliness, preventing sludge buildup that can clog critical oil passages. When performing an oil change, the engine requires approximately 9.5 quarts of oil when the filter is included. It is crucial to check the oil level after refilling to ensure the correct amount is used, avoiding potential damage from overfilling or underfilling. Proper torque specifications for the drain plug—22 ft/lbs for metal and 3 ft/lbs for plastic—should be followed to prevent stripping.
The cooling system is equally vital for a vehicle of this power output. The 2016 G550 has a coolant capacity of 11.1 quarts. Using a high-quality antifreeze is essential to prevent overheating, especially during off-road use or heavy towing. The AMSOIL Passenger Car & Light Truck Antifreeze & Coolant provides a 50/50 pre-mix formulation that protects all cooling system metals, gaskets, and hoses from corrosion and erosion. It is free from phosphates, nitrates, nitrites, silicates, borates, and amines, making it safe for all engine materials. Alternatively, the concentrated AMSOIL Propylene Glycol Antifreeze and Engine Coolant can be mixed with distilled water to achieve superior protection against boil-over and freezing, extending service intervals significantly.
The automatic transmission in the G550, specifically the 7-speed unit with codes 722.909 SL058 or SL057, requires a fluid that can maintain viscosity under heavy loads and varying temperatures. Whether your vehicle has the reduced-friction A89 code or not, the transmission capacity is 9.5 quarts for a total fill. The AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid is optimized to handle the rigors of the 4.0L engine, preventing wear and maintaining fluid dynamics in extreme conditions. The AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid is another excellent choice for general protection against wear and thermal breakdown, ensuring smooth shifts and reduced friction.
Differential lubrication is often overlooked but is crucial for the G550’s renowned four-wheel-drive capability. The front differential requires 3 pints of lubricant, while the rear differential requires 3.8 pints. Both axles utilize GLS44 specification fluids for all temperatures. The AMSOIL SEVERE GEAR 75W-90 100% Synthetic Gear Lube is formulated to control thermal runaway and reduce operating temperatures, which is vital when towing heavy loads or driving on steep terrain. The fluid contains friction modifiers that are essential for limited-slip differentials, preventing chatter and ensuring power is distributed effectively to all four wheels. This synthetic gear lube also resists rust and corrosion, extending the life of seals and equipment.
For braking and steering systems, reliability is non-negotiable. The AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid recommendation aligns with the manufacturer’s specifications for HBH brake systems, which require DOT 4 Plus, 0009895605090109, or products approved on MB Sheet 331.0. AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid provides stable viscosity over a wide temperature range, ensuring responsive braking and ABS functionality even after repeated hard stops. Similarly, the power steering system, designated PS015, benefits from the AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid. This fluid resists heat for long life, reduces friction, and helps seals remain soft to prevent leaks, keeping the steering operation quiet and smooth.
Vehicle Background
Originating from a legacy of rugged utility, the Mercedes-Benz G-Class has long been a symbol of off-road capability and luxury. The 2016 G550 represents a pivotal point in the model’s history, featuring a significant update in its powertrain. While earlier generations relied on naturally aspirated engines, the G550 introduced a twin-turbocharged 4.0L V8, offering a substantial boost in power and torque. This engine, part of the M276 family, delivers a driving character that is both powerful and refined, allowing the heavy SUV to accelerate with surprising agility.
Owners of the G550 typically value its unique combination of attributes. It retains the body-on-frame construction and permanent four-wheel drive of its military heritage, providing confidence in the most challenging terrains. At the same time, it offers a level of on-road refinement, interior luxury, and safety technology that rivals high-end sedans. The G550 is known for its commanding presence and distinctive boxy design, which has only become more iconic over the decades. It is a vehicle that serves well as a daily driver for families seeking an SUV with genuine off-road prowess, as well as a weekend companion for adventurers exploring remote locations. The robust engineering of the G-Class ensures that with the right maintenance, including high-quality synthetic lubricants, the vehicle can provide reliable service for many miles. The G550 sits in a market segment that values durability and prestige, making proper fluid maintenance a key component of owning and enjoying this unique vehicle.