The 2018 Lexus RC F is a high-performance sports coupe that demands precision in every aspect of its maintenance, particularly when it comes to lubrication. Powered by the naturally aspirated 5.0L V8 2UR-GSE engine, this vehicle generates substantial horsepower and torque, creating a demanding environment for its internal components. Standard oil change intervals and conventional fluids often fall short when dealing with the extreme thermal loads and high-RPM operation typical of this performance machine. Using high-quality synthetic motor oils, oil filters, transmission fluid, gear lube and grease ensures that the engine, transmission, and drivetrain remain protected against wear, sludge formation, and thermal breakdown, allowing the RC F to perform at its peak for years to come.
Recommended AMSOIL Products
- AMSOIL Signature Series 5W-30 100% Synthetic Motor Oil – The ultimate choice for unsurpassed engine protection, allowing for intervals up to 25,000 miles and providing 75% more protection against horsepower loss and wear.
- AMSOIL Extended-Life 5W-30 100% Synthetic Motor Oil – An excellent balance of performance and value, offering extended service life up to 20,000 miles with enhanced cleaning power to keep the engine running smoother.
- AMSOIL OE 5W-30 100% Synthetic Motor Oil – Designed to outperform conventional oils and meet original equipment standards, providing reliable protection up to 15,000 miles with zero LSPI events in testing.
- AMSOIL 5W-30 100% Synthetic High-Mileage Motor Oil – Specifically formulated for vehicles with over 75,000 miles to reduce sludge, boost detergents, and minimize oil consumption while maintaining peak performance.
- AMSOIL Oil Filter EA15K04 – Engineered for 99% efficiency at 20 microns, this filter provides greater capacity for contaminants and maintains lower restriction to ensure critical engine parts stay properly lubricated.
- AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Withstands the rigors of high-performance driving, heavy towing, and elevated temperatures, ensuring smooth shifts and reserve protection during severe use.
- AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – A cost-effective option that protects against wear while meeting the specific requirements for the Lexus AA80E transmission system.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A unique OAT formulation offering protection up to 150,000 miles or 5 years, designed to prevent corrosion and protect cooling system metals, gaskets, and hoses.
- AMSOIL SEVERE GEAR® 75W-85 100% Synthetic Gear Lube – Essential for the rear differential, this lubricant controls thermal runaway, reduces operating temperatures, and contains friction modifiers for limited-slip applications.
- AMSOIL SEVERE GEAR® 75W-90 100% Synthetic Gear Lube – An ideal alternative for the rear differential, offering advanced wear protection and long seal life for the high-torque demands of the RC F drivetrain.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Provides excellent responsiveness for the ABS and traction control systems, maintaining stable viscosity over a wide temperature range for consistent stopping power.
When selecting the correct oil grade, SAE 5W-30 is the best choice for the 2018 Lexus RC F, particularly for those seeking a balance of fuel economy and cold-weather starting capability. While other grades exist, adhering to 5W-30 ensures the engine receives the necessary film strength without increasing drag. The engine capacity for the 5.0L V8 is 9.3 quarts when performing a full change with the filter installed. It is crucial to torque the oil drain plug to 30 ft/lbs and install a new washer on the drain bolt to prevent leaks after the service. After refilling, always check the oil level to ensure the vehicle is properly lubricated.
Moving beyond the engine, the cooling system is a critical component for this high-output vehicle. The cooling system requires 12.2 quarts of antifreeze. Using a high-performance AMSOIL Passenger Car & Light Truck Antifreeze & Coolant ensures that the engine operates within safe temperature limits, protecting against the severe thermal stress that can occur during spirited driving or track use. This coolant is phosphate- and silicate-free, making it compatible with all cooling system materials and colors while preventing corrosion and erosion over the long term. For those requiring concentrated formula, the AMSOIL Propylene Glycol Antifreeze and Engine Coolant offers extended service life in various applications.
The automatic transmission, specifically the AA80E 8-speed unit, plays a vital role in how power is delivered to the rear wheels. The total fill capacity for the transmission is 11.8 quarts, though an initial fill of 3.9 quarts is required during assembly. Using a synthetic transmission fluid designed for fuel efficiency and severe service helps maintain the integrity of the clutch packs and valve body. The AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid remains fluid in sub-zero temperatures while providing the necessary resistance to thermal breakdown during high-load situations, ensuring smooth and precise shifts.
The rear differential requires specialized attention due to its limited-slip or torque vectoring capabilities. Depending on the specific configuration of the vehicle, the differential may require AMSOIL SEVERE GEAR® 75W-85 100% Synthetic Gear Lube or 75W-90 synthetic SEVERE GEAR® 75W-90 100% Synthetic Gear Lube. These lubricants are engineered to control thermal runaway, a common issue in high-performance differentials, and protect against rust and corrosion. They also contain friction modifiers that are essential for limited-slip differentials to prevent chattering and ensure smooth power delivery. The torque transfer module on certain models requires Toyota automatic transmission fluid type WS, which can be substituted with compatible synthetic options to maintain consistency across the drivetrain fluids.
For owners interested in fuel economy or maintaining peak engine performance, fuel additives play a supporting role. The AMSOIL P.i.® Performance Improver Gasoline Additive helps restore up to 14% horsepower and cleans GDI fuel injectors, which can become carbon-clogged over time. This additive controls pre-ignition knock and is compatible with capless fuel systems, making it a valuable addition for keeping the fuel delivery system of the RC F in top condition. Regular use helps prevent the buildup that can lead to poor idling and reduced power output. Additionally, the AMSOIL Upper Cylinder Lubricant Corrosion Inhibitor provides extra lubrication for the fuel system.
About the Vehicle
The 2018 Lexus RC F represents a significant milestone in the brand’s commitment to producing genuine sports coupes that rival European performance rivals. Built on the GA-L platform, which was developed with a focus on weight reduction and high rigidity, the RC F sits as the performance flagship of the RC series. Its heart is the legendary 5.0-liter naturally aspirated V8 engine, known internally as the 2UR-GSE. Unlike many of its contemporaries that rely on turbochargers or superchargers to boost power, Lexus opted for a high-revving, naturally aspirated setup that delivers linear power and a visceral driving experience that enthusiasts highly value.
Designed to be a true driver’s car, the RC F comes standard with a rear-wheel-drive layout and an 8-speed automatic transmission that features paddle shifters for manual control. The steering is electronically powered but tuned to provide sharp feedback, allowing the driver to feel the road through the wheels. The chassis geometry and suspension tuning are aggressive, aiming to reduce body roll while maintaining enough compliance for daily drivability. This blend of track capability and luxury refinement is what makes the RC F stand out in the competitive sports coupe segment, offering a sophisticated interior that contrasts with the raw mechanical engagement of the exterior dynamics.
Despite its robust engineering, the RC F is not immune to the challenges that come with high-performance vehicles. One common issue for owners of this model is oil consumption, which can occur over time due to the high operating temperatures and RPMs the engine is designed to sustain. Using a high-quality synthetic motor oil with a robust additive package can help seal rings and reduce this consumption, extending the life of the engine. Another potential problem is the buildup of carbon deposits on the intake valves and fuel injectors, particularly because the direct injection system used in the 2UR-GSE engine does not allow fuel to wash over the intake valves. This can lead to rough idling and a loss of power. Fuel system cleaners designed for GDI engines can effectively mitigate this buildup, restoring lost performance.
Thermal management is another critical area for the RC F. The heavy-duty demands placed on the cooling system during spirited driving can stress standard coolant formulations, leading to premature degradation or corrosion. High-performance coolants that offer superior heat transfer and extended service life are essential for keeping the engine temperatures stable. Additionally, the transmission fluid can suffer from heat degradation in track or aggressive canyon driving scenarios, leading to harsh shifts or slippage. Synthetic transmission fluids that resist oxidation and maintain viscosity under extreme heat provide a protective barrier against these failures, ensuring the 8-speed transmission continues to shift smoothly and efficiently. Addressing these specific concerns with the right lubricants helps owners maintain the performance and reliability of this exceptional vehicle for the long haul.