Maintaining the fluid integrity of the AMG GT R is critical because the engine operates at significantly higher temperatures than standard passenger vehicles. The twin-turbocharged setup places immense thermal loads on the oil, which can break down traditional mineral or semi-synthetic blends. AMSOIL synthetic formulations are engineered to resist thermal breakdown and oxidation, ensuring that the oil maintains its protective properties even when the engine is subjected to hard acceleration or track driving. Furthermore, the 4.0-liter engine requires a specific oil capacity of 7.4 quarts when including the filter change. Using the correct volume and type of oil ensures proper lubrication of the turbocharger bearings, camshafts, and pistons.
Engine Oil and Cooling System Specifications
For the engine oil, the recommended viscosity grades are 0W-40 and 5W-40 for all temperature conditions. This wide viscosity range is essential for a vehicle that is often used year-round in varying climates while maintaining performance in hot environments. The oil drain plug must be torqued to 22 ft-lbs to prevent leaks without stripping the aluminum pan. It is vital to check the oil level immediately after refilling to ensure the correct quantity is in the sump.
The cooling system requires a substantial amount of fluid, with a total capacity of 15 quarts. Proper cooling is non-negotiable for this high-output engine, as overheating can lead to catastrophic failures in the aluminum block and head. The AMSOIL Passenger Car & Light Truck Antifreeze & Coolant provides a 50/50 pre-mixed solution that protects all cooling system metals, gaskets, and hoses from corrosion. It is phosphate-, nitrate-, nitrite-, silicate-, borate-, and amine-free, making it compatible with all other antifreeze colors and safe for the various metals found in modern engines. Alternatively, the concentrated AMSOIL Propylene Glycol Antifreeze offers extended protection up to 150,000 miles or five years, providing an additional layer of defense against freezing in winter or boiling over in summer.
Braking and Steering Performance
The AMG GT R is not just about straight-line speed; handling and stopping power are equally critical. The braking system relies on DOT 4 fluid to function correctly, and AMSOIL’s DOT 3 and DOT 4 Synthetic Brake Fluid is specifically recommended to replace the factory fill. This fluid provides excellent responsiveness for ABS and traction control systems, maintaining a stable viscosity across a wide temperature range. This stability prevents the fluid from boiling during hard braking, which can lead to a spongy pedal and reduced stopping power.
Additionally, the power steering system benefits from a full synthetic fluid to handle the hydraulic loads of high-speed maneuvers. The AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid helps seals remain soft to prevent leaks while offering strong anti-wear protection. This ensures that the steering remains precise and quiet, a key characteristic of the driving experience in this vehicle.
Extended Protection and Vehicle Care
Beyond the essential fluids, keeping the fuel system clean and the vehicle protected from the elements ensures the longevity of this high-value asset. For drivers who plan to store the vehicle seasonally, AMSOIL Gasoline Stabilizer can keep fuel fresh for up to 12 months, preventing varnish and gum buildup in the fuel injectors. Similarly, AMSOIL Engine Fogging Oil can be used to coat internal engine components, preventing rust during long periods of inactivity.
For those who want to maintain peak performance between services, AMSOIL P.i.® Performance Improver Gasoline Additive can restore lost horsepower and clean fuel injectors. This additive helps the engine breathe better and can improve fuel economy, ensuring that the 4.0L engine delivers its full potential. Regular use of these additives, combined with high-quality base fluids, creates a comprehensive care regimen that keeps the vehicle running smoothly and efficiently.
Model History and Performance
The 2018 Mercedes-Benz AMG GT R is a dedicated sports car that was developed specifically to push the boundaries of what a street-legal vehicle could achieve. Born from the Mercedes-AMG performance division, this model is part of the AMG GT family, which was introduced to challenge the likes of the Porsche 911 in the sports coupe segment. Unlike the standard GT models, the “R” stands for Racing, indicating a vehicle that was heavily influenced by the AMG GT3 racing car, with a track-focused chassis and aerodynamic package.
At the heart of this machine is the M178 engine, a 4.0-liter twin-turbo V8 that was hand-built by technicians at the AMG factory in Affalterbach, Germany. This specific engine code, 178.980, is renowned for its reliability under extreme stress and its ability to produce power with instant throttle response. The engine features a flat-plane crankshaft in some variants, though in the GT R, the cross-plane crankshaft provides a distinct, aggressive exhaust note that is highly sought after by enthusiasts. The power output is significant, delivering the high torque figures necessary for rapid acceleration, often propelling the car from zero to sixty in under 3.5 seconds.
Owners of the AMG GT R typically appreciate the balance of raw power and everyday drivability. The interior is driver-focused, with a cockpit designed to keep the driver connected to the road. The chassis is stiff, providing excellent feedback through the steering wheel, while the suspension can be adjusted to soften up for daily driving or firm up for track use. This versatility makes it a favorite among those who want a car that can handle daily commutes but excels when driven hard on winding roads or a race track.
Despite its robust engineering, the AMG GT R is not without its potential challenges, particularly regarding fluid maintenance and heat management. The high-output engine and the aggressive nature of the driving style can lead to specific issues if proper lubrication is not maintained. One common concern for owners is the degradation of seals and gaskets over time due to the extreme heat generated by the turbochargers. Synthetic fluids like the AMSOIL 5W-40 or 0W-40 FS European Motor Oil help mitigate this by providing a stable film that protects seals from hardening and cracking, preventing oil leaks that are a frequent issue in high-mileage turbocharged vehicles.
Another area where owners may encounter problems is carbon buildup on the intake valves, a common issue in direct-injection engines like the one in the GT R. While the engine is designed to manage this, the use of fuel additives like AMSOIL P.i. Performance Improver can help prevent the accumulation of carbon deposits that restrict airflow and reduce engine efficiency. Additionally, the brake system in a performance vehicle like this is subjected to high thermal loads. Brake fluid can absorb moisture over time, leading to a lower boiling point and reduced braking performance. Regular flushing with a high-quality synthetic brake fluid like AMSOIL DOT 4 ensures that the braking system remains responsive and safe, even after repeated hard stops.
Finally, the cooling system in any high-performance sports car is a critical weak point if neglected. The tight packaging of the engine bay in the AMG GT R can make heat dissipation challenging. Coolant degradation can lead to corrosion within the aluminum cooling passages, potentially causing leaks or blockages. By adhering to a strict maintenance schedule and using a high-performance antifreeze like AMSOIL Propylene Glycol Antifreeze, owners can ensure that the cooling system continues to protect the engine effectively. The use of these specialized fluids is a proactive approach to solving these potential problems, ensuring that the vehicle remains a reliable and exhilarating daily driver for years to come.