The 2018 Audi S7 with the 4.0L twin-turbo V8 (Engine Code CTGE 5) represents the pinnacle of German engineering, blending supercar performance with the utility of a luxury sedan. To maintain the precise tolerances and high-output capabilities of this sophisticated powertrain, using the correct lubricants is non-negotiable. AMSOIL synthetic lubricants are engineered to meet the rigorous demands of European vehicles, offering protection that exceeds standard factory specifications. Whether you are pushing the vehicle to its limits on the track or navigating daily commuter traffic, the right fluids ensure optimal performance, extended component life, and the smooth driving experience the S7 is famous for.
Recommended AMSOIL Products
- AMSOIL 5W-40 MS 100% Synthetic European Motor Oil – Specifically formulated for the unique demands of gasoline, diesel, and hybrid European vehicles, featuring a precise blend of synthetic base oils and premium additives.
- AMSOIL 5W-40 FS 100% Synthetic European Motor Oil – An excellent alternative for this vehicle, designed to meet Audi and Volkswagen oil quality standards with outstanding thermal stability.
- AMSOIL 0W-40 FS 100% Synthetic European Motor Oil – Offers superior cold-weather starting and flow for the turbocharged engine while maintaining protection at high operating temperatures.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A unique poly-organic acid formulation that protects all cooling system metals, gaskets, and hoses while being phosphate and silicate-free.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated option that can be mixed with distilled water for maximum protection up to 150,000 miles or 5 years.
- AMSOIL 100% Synthetic DCT Fluid – Designed specifically for the S7’s 7-speed automatic transmission to prevent shudder and provide excellent wear protection in extreme heat and cold.
- AMSOIL 75W-90 Long Life 100% Synthetic Gear Lube – Engineered for high-load gear and bearing protection in the front and rear differentials, improving cold-weather shifting and seal life.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Provides excellent ABS and traction-control responsiveness with a stable viscosity over a wide temperature range.
Ensuring the 2018 Audi S7 receives the proper lubrication is critical due to its complex mechanical architecture. This vehicle utilizes a 4.0L TFSI V8 engine equipped with dual turbochargers and variable valve timing. The engine is designed to operate at high temperatures and high pressures, requiring an oil that can withstand extreme shear forces without breaking down. The factory-recommended viscosity is 5W-40, and the total system capacity, including the filter, is 9.2 quarts. Selecting an oil that meets the specific Audi and Volkswagen quality standards is essential to avoid triggering maintenance alerts or compromising the engine’s longevity. AMSOIL European formulas are crafted to meet or exceed these standards, providing a robust barrier against sludge formation and deposit buildup that can plague high-mileage turbocharged engines.
Beyond the engine, the cooling system plays a vital role in managing the thermal load of the S7. The system requires a capacity of approximately 12.7 quarts of coolant. Standard antifreeze formulations can degrade over time, leading to corrosion in the aluminum engine block and radiator components. Using a premium antifreeze like the Passenger Car & Light Truck Antifreeze & Coolant ensures that the vehicle remains protected from freezing in winter and overheating in summer, while the propylene glycol option offers a concentrated alternative for those who prefer mixing their own solution.
The transmission in this model is a sophisticated 7-speed S-tronic dual-clutch unit, designated by the code 0B5. Maintaining this transmission is equally important for a smooth driving experience. The total fill capacity is 7.9 quarts, while an initial fill requires roughly 5.8 to 6.3 quarts depending on the specific service procedure. AMSOIL 100% Synthetic DCT Fluid is designed to handle the intense friction heat generated during rapid shifting, preventing shudder and ensuring crisp engagement. This fluid helps extend the service life of the transmission clutches and bearings, keeping the power delivery seamless from a standstill to highway speeds.
The S7 also features a Quattro all-wheel-drive system, which relies on robust gear lubrication in both the front and rear differentials. The front differential requires 2.1 pints, and the rear requires 1.9 pints of fluid that meets the GLSC8 standard. Standard gear oils can wear out under the heavy torque loads produced by this super-sedan. Switching to a synthetic gear lube like the 75W-90 Long Life formulation provides high-load protection that resists rust and corrosion. This ensures that the differentials operate quietly and efficiently, reducing noise and vibration while improving overall drivetrain efficiency.
Finally, the braking system and overall vehicle maintenance benefit from premium fluids. The S7 requires a DOT 4 hydraulic brake fluid to handle the high heat generated during performance braking events. AMSOIL DOT 3 and DOT 4 Synthetic Brake Fluid offers a higher boiling point than standard fluids, preventing brake fade and ensuring consistent pedal feel. For vehicle owners who want to maximize fuel economy and power output, AMSOIL P.i.® Performance Improver Gasoline Additive can help restore fuel injectors to 100% flow rate and reduce the need for higher-octane fuels, making every gallon of gas go further while keeping the engine clean.
About the Vehicle: 2018 Audi S7
The 2018 Audi S7 stands as a testament to the brand’s ability to merge high-performance driving dynamics with everyday practicality. Based on the A7 platform, this vehicle is a four-door liftback that combines the sleek, aerodynamic lines of a coupe with the cargo utility of a sedan. Under the hood lies the highly regarded 4.0-liter V8 twin-turbocharged engine, which delivers immense power and torque. This powertrain is mated to an 8-speed Tiptronic automatic transmission in earlier iterations or a dual-clutch automatic (depending on specific market configurations for the 2018 model year) and is backed by the legendary quattro all-wheel-drive system, providing exceptional traction in all weather conditions.
Owners of the S7 typically appreciate its dual nature as a “super sedan.” It offers the comfort and luxury expected from a high-end German automaker, with a quiet cabin and plush interior, yet it possesses the acceleration capabilities of a sports car. The liftback design adds a unique versatility that sets it apart from traditional sedans, allowing for easier loading of cargo. The 2018 model year represents a mature version of the S7 lineage, refining the suspension tuning and electronic aids to offer a ride that is both composed and engaging.
While the S7 is a reliable machine, specific areas can benefit from the superior protection offered by premium synthetic fluids. One common issue associated with twin-turbocharged V8 engines of this era is the potential for carbon buildup on the intake valves and pistons due to direct injection and high-temperature operation. This can lead to rough idling and reduced power over time. Regular use of fuel system cleaners and high-quality synthetic oils can help mitigate this buildup and keep the combustion chambers clean.
Another area of concern for long-term ownership of high-performance Audis is the health of the cooling system. The tight tolerances of the engine make it susceptible to overheating if the coolant degrades or if the cooling system is not fully flushed with a high-quality coolant mixture. Corrosion inhibitors in standard coolants can diminish over time, leading to potential leaks or water pump failures. Upgrading to a phosphate-free, silicate-free antifreeze can extend the life of the cooling system components and prevent costly repairs.
Furthermore, the dual-clutch transmission, while fast and efficient, operates at very high temperatures. In extreme driving conditions, standard transmission fluids can break down, leading to shuddering or rough shifting. Synthetic DCT fluid is specifically designed to resist thermal breakdown, ensuring that the transmission clutches remain engaged smoothly and that the mechatronic unit stays cool. By proactively maintaining the transmission and differential fluids, owners can avoid expensive wear-related issues and keep the vehicle performing at its peak for years to come.
In conclusion, the 2018 Audi S7 is a remarkable vehicle that rewards its owners with a blend of luxury and performance. To preserve this capability, using the correct AMSOIL synthetic fluids is the best approach for maintenance. From the initial oil change to the final flush of the braking system, these products provide the protection needed to keep the S7 running smoothly, safely, and efficiently. Whether you are a weekend track enthusiast or a daily commuter, the peace of mind that comes with knowing your vehicle is protected by top-tier lubricants is invaluable.