The 2018 Lexus RC300, equipped with the advanced 2.0L 4-cylinder engine (Code 8AR-FTS) and its integrated turbocharger, demands precision when it comes to fluid maintenance. This high-performance sports coupe combines agility with powerful acceleration, making the choice of lubricants critical for sustaining its dynamic driving character and engine longevity. Neglecting the specific fluid requirements for this engine can lead to reduced performance, increased wear, and costly repairs over time. Understanding the unique needs of the turbocharged powerplant and the sophisticated transmission system is the first step in protecting your investment.
Recommended AMSOIL Products
To ensure your Lexus RC300 receives the highest level of protection, we have selected the top-performing lubricants and fluids designed for this specific vehicle. These products are formulated to exceed manufacturer specifications and provide superior performance in both extreme conditions and daily driving.
- AMSOIL Signature Series 0W-20 100% Synthetic Motor Oil – The premier choice for maximum engine protection, offering 75% more protection against horsepower loss and wear while supporting the unique demands of the 8AR-FTS turbocharged engine.
- AMSOIL Extended-Life 0W-20 100% Synthetic Motor Oil – An excellent option for extended oil change intervals, featuring 37% more cleaning power to keep the engine running smoother and longer.
- AMSOIL OE 0W-20 100% Synthetic Motor Oil – A high-quality synthetic alternative that fights sludge and deposits, trusted by professional engine builders and designed to meet OEM standards.
- AMSOIL 0W-20 100% Synthetic High-Mileage Motor Oil – An ideal choice for vehicles with over 75,000 miles, featuring boosted detergents and enhanced anti-wear additives.
- AMSOIL Oil Filter – Works in perfect harmony with AMSOIL motor oils to provide 99% efficiency at 20 microns, ensuring that contaminants are captured before they can damage engine components.
- WIX Oil Filter – A premium alternative offering improvements over original equipment manufacturer (OEM)-branded filters.
- AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Specifically designed for the AA81E transmission, this fluid withstands heavy towing, elevated temperatures, and provides reserve protection during demanding drives.
- AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – A cost-effective option that still delivers high performance and protection against wear.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A pre-mixed solution that offers protection for up to 150,000 miles, safeguarding the cooling system metals, gaskets, and hoses from corrosion and damage.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated option that delivers even more robust protection, extending service intervals up to 150,000 miles or five years.
- AMSOIL SEVERE GEAR® 75W-85 100% Synthetic Gear Lube – Ideal for the rear standard differential, this fluid provides advanced wear protection and controls thermal runaway to keep the drivetrain operating at optimal temperatures.
- AMSOIL SEVERE GEAR® 75W-90 100% Synthetic Gear Lube – Specifically for Limited Slip Differentials, providing advanced wear protection and thermal control.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Delivers excellent ABS and traction-control responsiveness with a stable viscosity over a wide temperature range, ensuring consistent stopping power.
- AMSOIL P.i.® Performance Improver – Restores fuel injectors to 100% flow rate after one tank, improving fuel economy and horsepower.
- AMSOIL Gasoline Stabilizer – Helps keep fuel fresh for up to 12 months, ideal for seasonal storage.
- AMSOIL Engine Fogging Oil – Designed to protect internal engine components during storage or long periods of inactivity.
- AMSOIL Synthetic Multi-Purpose Grease – Resists thermal and oxidation degradation for long-term performance in various applications.
- AMSOIL Heavy-Duty Metal Protector – Leaves a long-lasting protective, wax-like coating against salt and corrosion.
- AMSOIL MP Metal Protector – Cuts through rust and frees frozen components while protecting against corrosion.
- AMSOIL Silicone Spray – Protects with a dry lubricating film ideal for surfaces that may be damaged by conventional lubricants.
- AMSOIL Heavy-Duty Degreaser – Dissolves oil, tar, and grime for fast cleaning.
- AMSOIL Power Foam® Carburetor and Induction-System Cleaner – Cleans deposits from ethanol and degraded fuel to restore horsepower.
- AMSOIL Miracle Wash Waterless Wash and Wax Spray – Requires just two easy steps to leave vehicles with a fantastic shine.
- AMSOIL Brake and Parts Cleaner – Quickly removes oil, grease, and brake fluid without leaving residue.
- AMSOIL Mudslinger® Mud and Dirt Repellent – Provides a protective layer against the accumulation of mud and dirt.
- AMSOIL Engine Degreaser – Professional-strength formula that easily removes grease from engine surfaces.
- AMSOIL Glass Cleaner – Effectively cuts through grease and grime without streaks or haze.
- AMSOIL High-Foam Car Shampoo – Hard on dirt, gentle on coatings, and breaks down contaminants.
- AMSOIL Exterior Ceramic Spray – Sheds water rapidly and protects against UV rays.
- AMSOIL Interior Detailer – Light Lemon – Multi-surface use with UV protection.
- AMSOIL Interior Detailer – Scent Free – Multi-surface use with UV protection.
Engine Oil and Filter Recommendations
The heart of the 2018 Lexus RC300 is its 2.0-liter turbocharged four-cylinder engine, known as the 8AR-FTS. This engine is designed for both fuel efficiency and spirited performance, but the presence of a turbocharger introduces high heat and stress that conventional oils struggle to handle. For optimal protection, AMSOIL recommends a viscosity of 0W-20, which provides excellent starting performance in cold weather and ensures rapid lubrication at startup.
The total capacity for this engine, including the filter, is 4.9 quarts. When refilling, it is crucial to check the oil level after the refill and torque the drain plug to 30 ft/lbs. Always replace the drain plug gasket to prevent leaks. Among the top choices, AMSOIL Signature Series 0W-20 100% Synthetic Motor Oil stands out as the ultimate solution. It offers unsurpassed engine protection for up to 25,000 miles or one year, helping to maintain horsepower and reduce wear significantly better than standard oils.
For those seeking a balance of performance and value with extended intervals, the AMSOIL Extended-Life 0W-20 100% Synthetic Motor Oil is a robust option, providing up to 20,000 miles of guaranteed protection. It features enhanced cleaning power that helps keep the engine running smoother. Additionally, the AMSOIL OE 0W-20 100% Synthetic Motor Oil is a fantastic choice that effectively fights sludge and deposits, making it a trusted alternative to original equipment oils. For engines with over 75,000 miles, the AMSOIL 0W-20 100% Synthetic High-Mileage Motor Oil is a specialized option that helps engines last longer.
Filtering is just as important as the oil itself. The AMSOIL Oil Filter (EA15K02-EA) is engineered to provide 99% filtering efficiency at 20 microns. This high level of filtration removes wear-causing contaminants that can damage internal engine parts, extending the life of the engine. For owners who prefer a WIX brand filter, the WIX Oil Filter (57047-EA) is also recommended, offering premium media that improves upon OEM-branded filters.
Transmission and Cooling System Fluids
The 2018 Lexus RC300 is equipped with the AA81E eight-speed automatic transmission. Maintaining this transmission is vital for the vehicle’s smooth power delivery. The total fill capacity for the transmission is 9.2 quarts, with an initial fill capacity of 3.4 quarts. Using a fluid designed for this specific transmission prevents wear and temperature-related issues. AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid is formulated to withstand the rigors of heavy towing, elevated temperatures, and challenging terrain, ensuring the transmission remains fluid even in sub-zero conditions.
For a slightly more budget-conscious option that still delivers high performance, the AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid provides excellent protection against wear while maintaining the fuel efficiency of the vehicle. Both fluids offer superior performance compared to conventional automatic transmission fluids.
The cooling system is equally critical, as the turbocharged engine generates significant heat. The total coolant capacity is substantial, with 8.5 quarts for the engine and an additional 3.3 quarts for the intercooler. AMSOIL Passenger Car & Light Truck Antifreeze & Coolant is a phosphate-, nitrate-, and silicate-free formulation that protects all cooling system metals, gaskets, and hoses. It offers protection for up to 150,000 miles or five years. Alternatively, for those who prefer a concentrate, the AMSOIL Propylene Glycol Antifreeze and Engine Coolant delivers even more robust protection, extending service intervals up to 150,000 miles or five years in passenger cars and up to 240,000 miles or 20,000 hours in heavy-duty applications.
Differential and Brake Fluids
The rear differential in the 2018 Lexus RC300 requires specific attention to ensure smooth power transfer to the wheels. For the standard rear differential, AMSOIL SEVERE GEAR® 75W-85 100% Synthetic Gear Lube is the recommended fluid. It contains friction modifiers suitable for limited-slip applications and helps reduce operating temperatures, extending the life of the gears. If the vehicle is equipped with a Limited Slip Differential (GLS7), the AMSOIL SEVERE GEAR® 75W-90 100% Synthetic Gear Lube is the ideal choice, providing advanced wear protection and controlling thermal runaway.
Brake safety is paramount for any vehicle. The 2018 Lexus RC300 utilizes DOT 3 or DOT 4 brake fluid. AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid ensures excellent responsiveness for the ABS and traction control systems. Unlike conventional fluids that can absorb moisture over time, this synthetic fluid maintains a stable viscosity across a wide temperature range, providing consistent braking performance and preventing boil-off during heavy stops.
About the Vehicle: The 2018 Lexus RC300
The 2018 Lexus RC300 is a sleek and sophisticated coupe that blends the comfort of a luxury sedan with the dynamic handling of a sports car. As part of the RC series, this model occupies a unique space in the Lexus lineup, targeting drivers who value agility and style without sacrificing the premium quality associated with the brand. The RC300 introduced a turbocharged 2.0-liter four-cylinder engine to the lineup, replacing the previous naturally aspirated V6 options in certain markets or trim levels. This engine, known as the 8AR-FTS, delivers a strong blend of power and efficiency, making the RC300 a highly competitive choice in the luxury sports coupe segment.
The vehicle’s platform is based on the Toyota GA-L architecture, which emphasizes rigidity and low center of gravity. This design foundation contributes significantly to the car’s precise steering and responsive handling characteristics. Owners often appreciate the RC300 for its distinctive styling, featuring a bold spindle grille, sculpted body lines, and a low, wide stance that turns heads on the road. Inside, the cabin is tailored with high-quality materials and a driver-centric cockpit layout, ensuring that the driving experience remains comfortable and engaging.
The turbocharged nature of the 2.0L engine is a defining feature of the RC300. While this technology offers impressive acceleration and fuel economy, it also subjects the engine to higher thermal loads compared to naturally aspirated counterparts. This is where the choice of high-quality synthetic lubricants becomes critical. Proper maintenance with premium fluids helps mitigate the stress placed on the turbocharger and engine bearings, ensuring reliable performance over the long term.
Despite its robust engineering, the 2018 Lexus RC300 can face specific challenges common to turbocharged engines and performance vehicles. One known issue involves carbon buildup on the intake valves, a common occurrence in direct injection engines. Using high-quality synthetic oils that resist coking and additives like AMSOIL P.i.® Performance Improver can help restore fuel injectors and maintain flow rates, mitigating the effects of this buildup. Another potential concern is oil degradation under high thermal stress, which can lead to sludge formation. Switching to a high-performance synthetic like AMSOIL Signature Series provides superior resistance to thermal breakdown, keeping the engine clean and running smoothly. Additionally, turbochargers can suffer from oil starvation or coking at the center shaft if the oil is not stable at high temperatures. AMSOIL’s synthetic lubricants are specifically tested to prevent this, ensuring the turbocharger is adequately protected even after a spirited drive. Finally, the cooling system of a performance vehicle can be prone to overheating if the coolant loses its effectiveness. Regular use of a high-quality coolant like AMSOIL Passenger Car & Light Truck Antifreeze & Coolant ensures the cooling system remains free of corrosion and maintains optimal thermal transfer, preventing overheating issues that can damage the engine.
In summary, the 2018 Lexus RC300 is a vehicle that rewards attentive owners. By selecting the right lubricants and adhering to a strict maintenance schedule using products designed for its specific requirements, owners can enjoy the full potential of this luxury sports coupe for years to come.