The 2021 Lexus RC300 features a sophisticated 3.5-liter V6 engine (engine code 2GR-FKS), a powerplant known for its smooth power delivery and reliability. To maintain its performance and extend the lifespan of this precision-engineered vehicle, using the correct high-quality lubricants is essential. Synthetic lubricants offer superior protection against wear, sludge, and thermal breakdown compared to conventional oils, ensuring that every component, from the turbocharger to the transmission, operates at peak efficiency even under the harshest driving conditions.
Recommended AMSOIL Products
- AMSOIL Signature Series 0W-20 100% Synthetic Motor Oil – The ultimate choice for unsurpassed engine protection, offering up to 25,000 miles of guaranteed coverage and superior resistance to horsepower loss.
- AMSOIL Extended-Life 0W-20 100% Synthetic Motor Oil – Provides extended-life protection for up to 20,000 miles with 37% more cleaning power to keep the engine running smoother.
- AMSOIL OE 0W-20 100% Synthetic Motor Oil – A premium synthetic option that fights sludge and deposits, outperforming conventional oils while meeting OEM mileage standards.
- AMSOIL 0W-20 100% Synthetic High-Mileage Motor Oil – Formulated specifically for engines with over 75,000 miles, featuring boosted detergents to reduce sludge and improve cleaning power.
- AMSOIL Oil Filter – Designed for maximum efficiency, this filter captures 99% of contaminants at 20 microns, reducing engine wear and allowing lower restriction for better lubrication.
- WIX Oil Filter – A premium alternative media offering improvements over original equipment manufacturer-branded filters for optimal protection.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A pre-mixed, long-life formula providing up to 150,000 miles of corrosion protection for all cooling system metals and hoses.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated formula requiring mixing, designed to exceed OEM standards for metallic corrosion and erosion resistance.
- AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Withstands heavy towing and elevated temperatures, ensuring the transmission remains fluid in sub-zero conditions.
- AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Engineered to protect against wear while delivering fuel efficiency benefits for the A760H transmission.
- AMSOIL SEVERE GEAR® 80W-90 100% Synthetic Gear Lube – Offers advanced protection against wear and thermal runaway, ideal for limited-slip applications and general differential use.
- AMSOIL SEVERE GEAR® 75W-90 100% Synthetic Gear Lube – Contains friction modifiers for limited-slip differentials and helps reduce operating temperatures under heavy loads.
- AMSOIL SEVERE GEAR® 75W-85 100% Synthetic Gear Lube – An excellent choice for the rear limited-slip differential, providing long oil and seal life with friction modifiers.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Delivers excellent ABS and traction-control responsiveness with a stable viscosity range across all temperatures.
Protecting Your Engine
The heart of the 2021 Lexus RC300 is its 3.5-liter V6 engine, designated as the 2GR-FKS. This engine requires a viscosity of 0W-20 motor oil, with a total capacity of 6.8 quarts when the filter is replaced. Ensuring that you fill the engine to the correct level is critical for proper lubrication. AMSOIL oils are engineered to provide superior protection against the wear and horsepower loss that can occur over time. The Signature Series, in particular, offers up to 25,000 miles of protection, allowing you to extend service intervals and maintain peak engine performance longer than traditional oil change schedules would suggest. For those with higher mileage vehicles, the High-Mileage 0W-20 formula includes enhanced detergents to help clean out sludge and protect seals, making it an ideal choice for RC300s that have accumulated over 75,000 miles.
Oil filtration is equally important. Using the AMSOIL Oil Filter ensures that the engine oil is kept clean, capturing small wear-causing contaminants more effectively than many competitors. This filter is designed with a high capacity for contaminants and allows for lower restriction, which helps keep engine parts properly lubricated at all times. Alternatively, the WIX Oil Filter offers a premium media solution that improves upon OEM-branded filters, providing a robust barrier against engine wear.
Cooling and Transmission Systems
The cooling system in the Lexus RC300 requires a substantial amount of fluid, with a capacity of 10 quarts. Maintaining the health of this system is vital to prevent overheating, which can lead to severe engine damage. The AMSOIL Passenger Car & Light Truck Antifreeze & Coolant is a pre-mixed, ethylene glycol formula that offers protection for up to 150,000 miles. It is phosphate-, nitrate-, nitrite-, silicate-, borate-, and amine-free, making it safe for all cooling system metals and hoses while ensuring compatibility with other coolant colors. For those who prefer a concentrated solution, the AMSOIL Propylene Glycol Antifreeze provides exceptional corrosion protection and can be used up to 150,000 miles or 5 years when properly mixed.
The transmission is another critical component that benefits from high-performance fluid. The 2021 RC300 equipped with the 6-speed AWD A760H transmission requires specific attention to fluid quality. A total fill capacity of 10.6 quarts is required for complete system flushing, with an initial fill of 1.7 quarts. The AMSOIL Signature Series Fuel-Efficient Transmission Fluid is designed to withstand the rigors of heavy towing, elevated temperatures, and challenging terrain. It remains fluid in sub-zero temperatures, ensuring reliable performance regardless of the climate. For drivers seeking a balance of performance and value, the AMSOIL OE Fuel-Efficient Automatic Transmission Fluid provides excellent protection against wear while meeting the efficiency standards required by the vehicle manufacturer.
Drivetrain and Braking Systems
The differential and transfer case also require specialized lubrication to function correctly. For the front differential, the capacity is 1.5 pints, and it typically requires a GL-5 rating fluid. The AMSOIL SEVERE GEAR® 80W-90 is an excellent choice for this application, offering advanced protection against wear and controlling thermal runaway. It also contains friction modifiers suitable for limited-slip applications. For colder climates where the temperature drops below -18°F, the AMSOIL SEVERE GEAR® 75W-90 provides superior low-temperature flow while maintaining high-temperature protection. For the rear differential, which has a capacity of 2.9 pints, the AMSOIL SEVERE GEAR® 75W-85 is recommended, particularly for limited-slip differentials, ensuring long oil and seal life.
Braking performance is paramount for safety, and the RC300 benefits from using a high-quality synthetic brake fluid. The AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid ensures excellent responsiveness for ABS and traction-control systems. Its stable viscosity over a wide temperature range helps maintain consistent braking performance, preventing the boiling that can occur during heavy braking or in hot conditions.
About the Vehicle
The 2021 Lexus RC300 represents the pinnacle of Lexus’s coupe lineup, blending sporty aesthetics with the renowned reliability that the brand is famous for. Built on the GA-L platform, the RC300 offers a refined driving experience that is both comfortable and engaging. It is powered by the 2GR-FKS 3.5-liter V6 engine, a naturally aspirated powerhouse that delivers a smooth and linear power curve. This engine is paired with an 8-speed automatic transmission (or 6-speed AWD in certain configurations), ensuring seamless gear changes and responsive acceleration. The RC300’s interior is a testament to Lexus’s commitment to luxury, featuring high-quality materials, ergonomic design, and advanced technology that keeps the driver connected and informed.
One of the standout features of the RC300 is its balance between performance and practicality. While it is a compact two-door coupe, it offers surprising space for its class, making it suitable for daily driving as well as spirited weekend runs. The suspension tuning strikes a fine line between sporty handling and ride comfort, allowing the car to absorb road imperfections without sacrificing body control. Owners often praise the RC300 for its quiet cabin, excellent build quality, and the sense of confidence it inspires on the road. The vehicle’s origins lie in the F-Series platform, which has been used in various high-performance Toyota and Lexus models, contributing to its solid engineering foundation.
Despite its reliability, the RC300 is not without its challenges. Some owners have reported issues with the infotainment system lag or occasional software glitches, which can be frustrating but are generally manageable. Additionally, like many sporty coupes, the rear seats can be cramped, limiting the vehicle’s utility for carrying passengers. Another common issue reported by RC300 owners is the potential for suspension bushing wear over time, particularly in areas with rough roads, which can lead to clunks or vibrations. Furthermore, the CVT or automatic transmission in some models may exhibit shuddering under light acceleration, a problem that can be mitigated with high-quality transmission fluid. Using premium synthetic oils and fluids can help address these mechanical nuances, reducing friction and wear on critical components, thereby extending the life of the vehicle and maintaining its pristine driving dynamics.