The 2021 Lexus RX350 is powered by the robust 3.5L 6-cylinder 2GR-FKS engine, a powerplant designed for reliability and smooth performance. To maintain its optimal operation, utilizing high-quality synthetic lubricants is essential. Proper fluid selection ensures the engine receives protection against wear, sludge, and high-temperature breakdown, extending the vehicle’s service life and maintaining peak fuel economy.
Recommended AMSOIL Products
- AMSOIL Signature Series 0W-20 100% Synthetic Motor Oil – The premier choice offering up to 25,000 miles of protection with unmatched horsepower preservation and wear defense.
- AMSOIL Extended-Life 0W-20 100% Synthetic Motor Oil – An excellent option providing 20,000 miles of protection with enhanced cleaning power to keep the engine running smoothly.
- AMSOIL OE 0W-20 100% Synthetic Motor Oil – A cost-effective synthetic solution that fights sludge and deposits while outperforming conventional oils for standard service intervals.
- AMSOIL 0W-20 100% Synthetic High-Mileage Motor Oil – Specifically formulated for vehicles with over 75,000 miles to reduce oil consumption and sludge buildup.
- AMSOIL Oil Filter – Delivers 99% filtration efficiency at 20 microns, reducing engine wear and extending service life.
- WIX Oil Filter – A premium aftermarket option that offers improved filtration over original equipment manufacturer-branded filters.
- WIX Air Filter – Premium media that ensures clean airflow to the engine for optimal combustion and performance.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A pre-mixed 50/50 formula protecting against corrosion for up to 150,000 miles or 5 years.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated high-performance coolant offering superior corrosion protection and extended service intervals.
- AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Engineered to withstand heavy towing and elevated temperatures while maintaining fluidity in sub-zero conditions.
- AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – A high-quality alternative that protects the transmission against wear and sludge for standard intervals.
- AMSOIL SEVERE GEAR® 75W-85 100% Synthetic Gear Lube – Provides advanced protection for differential and transfer case gears, controlling thermal runaway and reducing operating temperatures.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Offers a stable viscosity over a wide temperature range, ensuring excellent ABS and traction-control responsiveness.
Understanding the specific fluid needs of the 2021 RX350 helps owners make informed decisions about maintenance. The engine requires a specific volume to ensure proper lubrication of all moving parts. For this vehicle, the oil capacity is 5.8 quarts when the filter is replaced. It is crucial to refill the correct amount, check the oil level after the refill, and tighten the drain plug to 30 ft/lbs to prevent leaks. Using the recommended viscosity of 0W-20 is vital for achieving the best fuel economy and ensuring quick lubrication during cold weather starts. However, owners must adhere to the 0W-20 specification at every oil change to maintain engine warranty compliance and performance standards.
Beyond the engine, the transmission system plays a critical role in the driving experience. The 2021 Lexus RX350 equipped with the 8-speed automatic transmission (U881F for AWD models) requires a specialized transmission fluid. The initial fill capacity is 3.2 quarts, while a total fill for the AWD system holds 7.2 quarts. For the FWD variant with the U881E transmission, the initial fill is also 3.2 quarts with a total capacity of 7.2 quarts. Switching to a high-performance synthetic transmission fluid can significantly extend the life of the transmission components, especially for drivers who engage in heavy towing or drive in challenging terrains. The fluid remains fluid in sub-zero temperatures and provides reserve protection during heavy use, preventing the sludge and wear that can lead to costly repairs.
Cooling system integrity is another critical maintenance point. The cooling system capacity varies slightly based on the specific configuration, ranging from 9.5 quarts to 10.5 quarts. Maintaining a robust antifreeze and coolant mixture is essential to prevent overheating and corrosion. AMSOIL’s Passenger Car & Light Truck Antifreeze & Coolant is an Ethylene Glycol 50/50 pre-mix that is phosphate, nitrate, nitrite, silicate, borate, and amine-free. This formulation is compatible with all other antifreeze colors and protects all cooling system metals, gaskets, and hoses. For those who prefer a concentrated option, the Propylene Glycol variant offers exceptional protection, capable of lasting up to 150,000 miles in passenger cars and light trucks, or up to 1,000,000 miles in heavy-duty applications.
Proper lubrication extends to the differential and transfer case as well. The transfer case, if equipped, requires a specific volume, often noted as U/K TRC with a capacity of 1.7 pints. The rear differential needs 1.1 pints of gear lubricant. Both systems are designed for GL-5 application, and the use of synthetic gear lube like AMSOIL SEVERE GEAR® 75W-85 ensures long oil, seal, and equipment life. This gear lube contains friction modifiers suitable for limited-slip applications and helps control thermal runaway, a common issue in high-stress driving conditions. Additionally, the brake fluid should be replaced with a DOT 3 and DOT 4 100% Synthetic Brake Fluid to ensure stable performance under the high temperatures generated by the braking system.
About the Vehicle
The 2021 Lexus RX350 stands as a testament to the brand’s legacy of combining luxury with practicality. Positioned as a mid-size luxury crossover SUV, the RX350 has long been a benchmark in its segment, offering a balance of comfort, reliability, and performance that appeals to a wide range of drivers. The fifth-generation RX, introduced in 2015 and continued through the 2021 model year, builds upon the platform’s reputation for smooth handling and refined cabin quality.
Powered by the naturally aspirated 3.5-liter V6 engine, code-named the 2GR-FKS, the RX350 delivers a robust and linear power delivery. This engine is known for its durability and smooth operation, producing power that is sufficient for daily commuting, family road trips, and even light towing duties. The engine’s design prioritizes efficiency without sacrificing performance, making it a versatile powerplant for the diverse needs of modern families. The pairing of this V6 with an 8-speed automatic transmission ensures seamless gear changes, contributing to the vehicle’s reputation for a serene and composed ride.
Inside, the RX350 offers a spacious and well-appointed interior. The cabin is designed with a focus on driver and passenger comfort, featuring high-quality materials, intuitive controls, and a quiet environment that isolates occupants from road noise. The vehicle’s SUV stature provides a commanding view of the road, while the crossover design offers easier access compared to traditional sedans. Available in various trims, the 2021 model continues to offer premium amenities such as advanced safety features, a sophisticated infotainment system, and available all-wheel drive capabilities that enhance stability in adverse weather conditions.
For owners of the 2021 Lexus RX350, proper maintenance is key to preserving the vehicle’s value and performance. The 2GR-FKS engine, while reliable, can benefit significantly from the use of high-quality synthetic oils to prevent issues that may arise over time. Common areas of concern for vehicles with this engine and mileage can include sludge buildup in the valve covers and oil passages, which can hinder oil flow and lead to increased wear. AMSOIL’s advanced synthetic formulations are designed to fight these deposits, ensuring the engine remains clean and lubricated effectively. Additionally, high-mileage models may experience increased oil consumption due to worn piston rings or seals; the AMSOIL High-Mileage 0W-20 motor oil contains specialized additives that help condition seals to reduce consumption and minimize leaks.
Furthermore, owners who utilize their RX350 for towing or frequently carry heavy loads may notice transmission heat buildup. While the factory fluid is adequate for normal driving, synthetic transmission fluids like those offered by AMSOIL provide superior thermal stability, protecting the transmission from the stress of heavy towing. By addressing these potential weak points with superior lubricants, owners can ensure their Lexus RX350 remains a reliable and comfortable companion for years to come. The vehicle’s design and engineering quality are evident in its smooth ride and quiet operation, but these qualities are maintained through consistent, high-quality maintenance practices.
Ultimately, the 2021 Lexus RX350 represents a smart choice for drivers seeking a premium SUV that does not compromise on comfort or capability. With the right choice of lubricants, owners can maximize the vehicle’s potential, ensuring smooth operation, extended service intervals, and long-term reliability. Whether navigating city streets or cruising on highways, the RX350 remains a standout in the luxury crossover segment, defined by its blend of Lexus craftsmanship and versatile performance.
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