The 2021 Lexus RC350 is a sophisticated performance coupe powered by the 3.5-liter 2GR-FKS V6 engine. To maintain the precision engineering and reliability that Lexus owners expect, using the correct synthetic lubricants is essential. This engine is sensitive to oil viscosity and requires high-quality protection to handle its turbocharger technology and high-output performance. Regular maintenance with top-tier fluids extends service intervals and ensures smooth operation under various driving conditions.
Recommended AMSOIL Products
For the 2021 Lexus RC350, AMSOIL offers a comprehensive range of synthetic lubricants designed to meet and exceed manufacturer specifications. Below are the recommended products for engine, transmission, differential, and other vital systems:
- AMSOIL Signature Series 0W-20 100% Synthetic Motor Oil – The premier choice for maximum engine protection against wear and horsepower loss, offering up to 25,000 miles of protection.
- AMSOIL Extended-Life 0W-20 100% Synthetic Motor Oil – Provides extended protection for up to 20,000 miles with superior cleaning power to keep the engine running smoothly.
- AMSOIL OE 0W-20 100% Synthetic Motor Oil – An excellent value option that fights sludge and deposits while protecting turbochargers effectively.
- AMSOIL 0W-20 100% Synthetic High-Mileage Motor Oil – Specifically formulated for vehicles with over 75,000 miles to reduce oil consumption and sludge.
- AMSOIL Oil Filter EA15K02 – Offers 99% filtration efficiency at 20 microns to remove contaminants and reduce engine wear.
- AMSOIL Oil Filter EA15K49 – An alternative high-performance filter option with extended service life capabilities.
- WIX Oil Filter 57047 – A premium aftermarket filter that meets manufacturer OE recommended intervals.
- AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Designed to withstand heavy towing and elevated temperatures while improving fuel economy.
- AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – A cost-effective alternative that still provides excellent protection against wear.
- AMSOIL SEVERE GEAR® 80W-90 100% Synthetic Gear Lube – Provides advanced protection for differentials, controlling thermal runaway and rust.
- AMSOIL SEVERE GEAR® 75W-90 100% Synthetic Gear Lube – Ideal for limited-slip applications and extreme operating conditions.
- AMSOIL SEVERE GEAR® 75W-85 100% Synthetic Gear Lube – Perfect for front differentials requiring GL-5 specifications below 80 degrees.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A pre-mix formulation that protects cooling system metals and lasts up to 150,000 miles.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Ensures excellent ABS responsiveness and stable viscosity across a wide temperature range.
Engine Oil and Filtration Specifications
The heart of the 2021 Lexus RC350 is the 3.5-liter inline-six cylinder engine, identified by the code 2GR-FKS. This powerplant is engineered for high efficiency and performance, requiring specific viscosity to ensure optimal flow during cold starts and protection during high-load operations. The manufacturer specifies 0W-20 viscosity for all temperature ranges, a requirement that AMSOIL’s synthetic oils exceed. When performing an oil change, the system capacity is approximately 6.8 quarts when including the filter, though some sources note 6 quarts with filter for certain service conditions. Always verify the oil level on the dipstick after refilling.
Proper filtration is just as critical as the oil itself. The 2GR-FKS engine generates significant heat and contaminants that can accelerate wear if not removed efficiently. AMSOIL Oil Filter models, such as the EA15K02 and EA15K49, are designed with premium media to capture smaller particles than traditional filters. They feature a lower restriction design, which maintains oil pressure and flow rate even as the filter loads up with debris. This ensures that clean oil circulates through the engine’s bearings and camshafts, reducing friction and extending component life. For those preferring established aftermarket brands, the WIX Oil Filter 57047 also meets the necessary specifications and offers improved performance over original equipment manufacturer filters.
Transmission and Differential Maintenance
The Lexus RC350 comes equipped with advanced automatic transmissions, either the 8-speed RWD AA81E or the 6-speed AWD A760H, depending on the configuration. These transmissions require a fluid that can handle high torque loads, rapid shifts, and elevated temperatures without degrading. AMSOIL Signature Series Fuel-Efficient Automatic Transmission Fluid is formulated to remain fluid in sub-zero temperatures and provide reserve protection during heavy use. The total fill capacities vary significantly based on whether the vehicle is performing an initial fill or a complete flush; capacities range from 3.4 quarts to as much as 10.6 quarts for the AWD configuration. Using the correct fluid ensures smooth shifting and protects the intricate valve bodies and clutch packs inside.
For the rear differential, which often features a limited-slip mechanism, AMSOIL SEVERE GEAR lubricants offer robust protection. The capacity for the rear differential is approximately 2.9 pints. The GL-5 rated fluids, such as the 75W-85 or 75W-90, contain friction modifiers essential for limited-slip differentials to prevent binding and chatter. The front differential requires a similar level of protection, with a capacity of 1.5 pints. Using a synthetic SEVERE GEAR 80W-90 gear lube ensures that metal-to-metal contact is minimized, operating temperatures are controlled, and rust or corrosion is prevented, even in harsh winter conditions.
Coolant and Brake Fluid Considerations
The cooling system in the 2021 Lexus RC350 holds approximately 10 quarts of coolant. Maintaining the correct coolant mixture is vital for preventing overheating in traffic or during spirited driving, as well as for protecting against freezing in cold climates. AMSOIL Passenger Car & Light Truck Antifreeze & Coolant is a phosphate-, nitrate-, nitrite-, silicate-, borate-, and amine-free formulation that is compatible with all other antifreeze colors. It is pre-mixed for immediate use and offers protection up to 150,000 miles or five years. For those who prefer a concentrated solution, the AMSOIL Propylene Glycol Antifreeze and Engine Coolant allows for custom mixing while delivering superior corrosion protection and extended service intervals.
Brake system integrity is a non-negotiable safety feature. The RC350 utilizes a DOT 3 or DOT 4 AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid system. Standard brake fluids can absorb moisture over time, which lowers the boiling point and leads to a spongy pedal feel or brake fade. Our synthetic brake fluid maintains a stable viscosity over a wide temperature range, ensuring consistent pedal feedback. This fluid provides excellent responsiveness for both ABS and traction control systems, giving drivers confidence in all weather conditions.
About the Vehicle
The 2021 Lexus RC350 represents the evolution of Lexus’s coupe lineup, blending luxury with dynamic driving capabilities. As part of the RC series, it is designed for drivers who appreciate a sportier driving character compared to the sedan counterparts. The vehicle is built on the Toyota GA-L platform, which provides a low center of gravity and improved rigidity, enhancing handling and cornering stability. The 3.5-liter V6 engine is renowned for its smooth power delivery and high-revving nature, making it a favorite among enthusiasts who enjoy a responsive acceleration profile.
Owners of the RC350 often cite the interior quality and technology integration as standout features. The cabin is finished with premium materials, and the dashboard layout prioritizes driver engagement with intuitive controls. The vehicle has gained a reputation for reliability, largely due to the robustness of the 2GR-FKS engine, which has been used in various Toyota and Lexus applications for years. Despite its luxury status, the RC350 is often praised for its practicality, offering a comfortable ride for daily commutes while remaining capable on winding roads during the weekend.
However, like any sophisticated machine, the RC350 has specific maintenance needs that can prevent common issues. One area where owners sometimes report concern is the potential for oil consumption in high-mileage examples, particularly if the vehicle is driven aggressively. Using a AMSOIL 0W-20 100% Synthetic High-Mileage Motor Oil with enhanced seal conditioning and reduced sludge formation can help mitigate this issue, ensuring the engine retains its compression and power output. Another potential area of concern involves the transmission, specifically the AWD variants which can be prone to heat buildup during extended spirited driving. Upgrading to a synthetic AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid with higher thermal stability can prevent premature wear and extend the service life of the transfer case and differentials.
Additionally, some owners have noted that the brake fluid may require more frequent flushing than standard intervals to maintain peak performance, especially if the vehicle is driven in mountainous regions or under heavy load. Synthetic brake fluid helps maintain a higher boiling point, reducing the risk of vapor lock. Finally, while the suspension is generally robust, keeping the chassis components clean and lubricated with appropriate grease can prevent premature wear on bushings and joints, maintaining the vehicle’s precise handling characteristics over the long term. Regular maintenance with high-quality fluids ensures that the RC350 continues to deliver the luxury and performance that Lexus owners expect.