The 2018 Mercedes-Benz G63 AMG is a formidable machine, combining the rugged, boxy utility of the G-Class with the high-performance spirit of the AMG lineup. Under the hood lies a twin-turbocharged 5.5-liter V8 engine, codified as engine code 157.984.7, which delivers immense power and torque. To keep this sophisticated German engineering running at peak performance, selecting the correct lubricants is not just a maintenance task; it is a critical requirement for longevity and reliability. The unique demands of this turbocharged, direct-injection engine, along with its sensitive transmission and cooling systems, necessitate fluids that exceed standard OEM specifications.
Recommended AMSOIL Products
For the 2018 Mercedes-Benz G63 AMG, AMSOIL offers a comprehensive range of synthetic lubricants designed to handle extreme operating conditions, from high-heat track driving to daily city commuting. The engine requires oils that provide superior protection against the thermal stress of the twin turbos and the high compression ratios typical of AMG engines. Similarly, the automatic transmission and cooling systems require specific formulations to ensure longevity and efficiency.
- AMSOIL 5W-40 FS 100% Synthetic European Motor Oil – Specifically designed for the unique demands of gasoline and turbocharged European vehicles, featuring a precise blend of synthetic base oils and premium additives for superior protection.
- AMSOIL 0W-40 FS 100% Synthetic European Motor Oil – An excellent choice for colder climates or extreme performance needs, offering the same European-focused formulation with enhanced cold-flow properties.
- AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Withstands the rigors of heavy towing and elevated temperatures while remaining fluid in sub-zero conditions to protect your 722.9 transmission.
- AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – A cost-effective alternative that still provides OE-level protection against wear and sludge for the G63’s automatic transmission.
- AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid – Reduces friction and helps seals remain soft to prevent leaks, resisting heat for a long fluid life in the steering system.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A phosphate-, nitrate-, and silicate-free formulation that protects all cooling system metals and provides up to 150,000 miles of protection.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated option that greatly surpasses OEM standards for corrosion and erosion protection, requiring mixing with distilled water.
- AMSOIL P.i. Performance Improver Gasoline Additive – Restores up to 14% horsepower by cleaning GDI fuel injectors and reducing the need for higher-octane fuel.
The engine specifications for the 2018 G63 AMG dictate a substantial oil capacity. With a 5.5-liter V8 engine, the total oil capacity is 9 quarts when including the oil filter. Owners should strictly adhere to the refill specifications; after refilling, the oil level must be checked via the electronic dipstick or sensor system. The service procedure requires specific torque values for the drain plug depending on the bolt type: 3 ft/lbs for plastic plugs, 22 ft/lbs for M14 bolts, and 15 ft/lbs for M12 bolts. It is crucial to replace the drain plug seal every time the oil is changed to prevent leaks, a common issue in high-mileage turbocharged engines.
Beyond the engine, the cooling system of this powerhouse requires vigilant maintenance. The cooling system capacity is split between the High Temp Cooling Circuit (HTCC), which holds 14.6 quarts, and the Low Temp Cooling Circuit (LTCC), holding 3.1 quarts. Maintaining the correct mixture of AMSOIL Passenger Car & Light Truck Antifreeze & Coolant is vital to prevent overheating, which can quickly damage the aluminum components of the G63’s engine block and cylinder heads. AMSOIL coolants are engineered to be compatible with all other coolant colors and are free from harsh additives that can degrade gaskets and hoses over time. For high heat applications, the AMSOIL Propylene Glycol Antifreeze and Engine Coolant also provides exceptional protection.
The 7-speed 722.9 automatic transmission is another critical component that demands a specific fluid. Whether the vehicle has the A89 Reduced-Friction code on the data card or not, the total fill capacity for the 7-speed transmission is 9.5 quarts. Using a synthetic transmission fluid that remains stable under the extreme loads of a G-Class is essential. AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid and AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid offer protection against wear, sludge, and temperature-related problems, ensuring smooth shifts and extending the life of the transmission.
Vehicle Background
The 2018 Mercedes-Benz G63 AMG represents the pinnacle of the “G-Wagen” lineage, a vehicle with a history dating back to the 1970s originally designed for military and utility use. However, by 2018, the G63 had evolved into one of the most recognizable and sought-after luxury performance SUVs on the market. The platform, known for its rugged, boxy design and solid-body-on-frame construction, provides a unique driving experience that blends off-road capability with street presence rarely seen in other vehicles.
Under the hood, the M157 engine is the heart of the 2018 G63. This 5.5-liter, V8 twin-turbocharged unit produces immense power, typically rated around 577 horsepower and 627 lb-ft of torque. This makes the G63 one of the more powerful SUVs of its era, capable of rapid acceleration despite its heavy weight, which hovers around 5,900 pounds. The driving character is distinct; it feels heavy and planted, yet the AMG tuning allows for spirited performance. The vehicle is a flagship of Mercedes-AMG, signaling high status and raw performance to anyone who sees it on the road.
Despite its robust reputation, the 2018 G63 AMG does face specific challenges that owners should be aware of. These issues are often related to the complexity of the engine and the wear-and-tear of high-performance driving. One common concern is the potential for carbon buildup on the intake valves and fuel injectors, particularly with the Direct Injection (GDI) system used in the M157 engine. This buildup can lead to reduced fuel efficiency, rough idling, and a loss of power over time. Regular use of a high-quality fuel additive like AMSOIL P.i. Performance Improver can help mitigate this by keeping injectors clean and restoring flow rates. The AMSOIL Upper Cylinder Lubricant Corrosion Inhibitor also helps lubricate the fuel system and upper cylinders.
Another known issue involves the valve cover gaskets and other sealing components. The high operating temperatures generated by the twin turbos can cause these gaskets to harden and eventually leak oil. This is a frequent maintenance item on higher-mileage G-Class vehicles. Using a synthetic AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid and motor oil that resists heat degradation and helps keep seals soft can extend the life of these components and delay the onset of leaks. Furthermore, the transmission in some 2018 models may experience shifting irregularities if the fluid degrades under the heavy load. Maintaining the fluid with a high-performance synthetic product can improve shift quality and protect internal transmission components from wear.
Finally, the G63’s complex cooling system is susceptible to leaks and overheating if not properly maintained. The plastic components in the cooling system, such as expansion tanks and thermostat housings, can become brittle over time due to heat cycling. Using a high-quality antifreeze that is phosphate-free and compatible with the vehicle’s metals can help prevent corrosion and extend the life of these parts. By addressing these specific areas with the right lubricants, owners can ensure their G63 remains a reliable and powerful machine for years to come.
Whether you are driving on the highway or tackling off-road trails, the 2018 G63 AMG deserves the best protection. AMSOIL synthetic lubricants provide a level of performance that meets and exceeds the rigorous demands of this German engineering masterpiece. From the initial startup in freezing temperatures to the high heat of extended drives, these fluids ensure that your vehicle operates smoothly and efficiently.
Owners of the G63 AMG can also take advantage of seasonal maintenance tools to keep their vehicle in top shape. Products like the AMSOIL Engine Fogging Oil are ideal for storage periods, protecting internal engine components from rust during long periods of inactivity. For vehicles in storage, the AMSOIL Gasoline Stabilizer helps keep fuel fresh up to 12 months. For those looking to maximize fuel economy and clean up carbon deposits, the AMSOIL P.i. Performance Improver is a powerful addition to every tank of gas.
Maintaining this vehicle is not just about following a schedule; it is about understanding the unique needs of a high-performance luxury SUV. By selecting the correct AMSOIL products, you are investing in the long-term health and performance of your G63. The comprehensive range of fluids available ensures that every aspect of the vehicle, from the engine to the transmission and cooling system, receives the protection it needs to perform at its best.
The 2018 Mercedes-Benz G63 AMG is a vehicle built for those who demand excellence. By utilizing the recommended synthetic lubricants, you are ensuring that the car lives up to its legendary reputation for power, luxury, and reliability. From the robust 5.5-liter V8 to the sophisticated transmission system, every component benefits from the superior protection offered by AMSOIL products.
As you consider your next maintenance schedule, remember that the right fluids can make a significant difference in the longevity and performance of your vehicle. The G63 is a complex machine that rewards proactive and informed maintenance. With the right care, the 2018 G63 AMG will continue to be a standout vehicle, offering a blend of off-road capability and on-road performance that is truly unmatched.