The 2008 Lexus GS350 is powered by the robust 2GR-FSE 3.5-liter V6 engine, a powerplant known for its smooth power delivery and reliability. However, maintaining peak performance requires more than just following a standard maintenance schedule; it demands the use of high-quality fluids designed to handle the specific demands of this engine and its transmission systems. Whether you are driving in extreme temperatures, towing heavy loads, or simply extending the intervals between service, the right lubricants provide a critical layer of protection that preserves engine life and driving dynamics.
Recommended AMSOIL Products
- AMSOIL Signature Series 5W-30 100% Synthetic Motor Oil – The premier choice for maximum engine protection, offering 75% more resistance to horsepower loss and wear compared to conventional oils, with a guaranteed interval of up to 25,000 miles.
- AMSOIL Extended-Life 5W-30 100% Synthetic Motor Oil – A balanced option providing extended protection of up to 20,000 miles with enhanced cleaning power to help keep the engine running smoother for longer.
- AMSOIL OE 5W-30 100% Synthetic Motor Oil – An excellent value choice that outperforms conventional oils and fights sludge and deposits, delivering protection similar to OEM specifications.
- AMSOIL 5W-30 100% Synthetic High-Mileage Motor Oil – Formulated specifically for vehicles with over 75,000 miles, this oil reduces sludge and helps restore performance in older engines.
- AMSOIL Oil Filter – Engineered for superior filtration, this filter captures 99 percent of contaminants at 20 microns and offers greater capacity than competing brands to reduce engine wear.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A pre-mixed 50/50 formulation that protects all cooling system metals, gaskets, and hoses for up to 150,000 miles or five years.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated, eco-friendly alternative that offers extended protection up to 150,000 miles without the need for ethylene glycol.
- AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Withstands heavy towing, elevated temperatures, and challenging terrain while remaining fluid in sub-zero conditions.
- AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – A high-performance fluid that resists wear and provides reliable protection for your transmission system.
- AMSOIL SEVERE GEAR 80W-90 100% Synthetic Gear Lube – Ideal for front and transfer cases requiring GL-5 lubricants, it contains friction modifiers for limited-slip applications.
- AMSOIL SEVERE GEAR 75W-90 100% Synthetic Gear Lube – A versatile gear lube that controls thermal runaway and protects against rust and corrosion.
- AMSOIL SEVERE GEAR 75W-85 100% Synthetic Gear Lube – Specifically recommended for the rear differential, this fluid offers advanced protection for limited-slip differentials.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Provides excellent ABS and traction-control responsiveness with a stable viscosity over a wide temperature range.
- AMSOIL P.i. Performance Improver Gasoline Additive – Restores up to 14% horsepower and cleans GDI fuel injectors to 100% flow rate in a single tank.
Engine Oil and Filtration Specifications
The heart of the 2008 Lexus GS350 is the 3.5-liter 6-cylinder engine (Engine Code 2GR-FSE I). To maintain the integrity of this powerplant, AMSOIL recommends a 5W-30 viscosity grade for all operating temperatures. When performing a complete oil change, including the filter, the total fluid capacity is 6.8 quarts. It is crucial to ensure the oil level is checked after the refill to guarantee proper lubrication. The drain plug torque specification is 30 ft/lbs, ensuring a secure seal without risking damage to the oil pan.
Choosing the correct filter is just as critical as the oil itself. The AMSOIL Oil Filter (Part Code EA15K49-EA) is designed to fit this vehicle perfectly. It provides a filtration efficiency of 99 percent at 20 microns, which is essential for trapping wear-causing contaminants. This filter allows for lower restriction, keeping engine parts lubricated, and offers extended service life to match the extended oil change intervals of synthetic motor oil. For owners who prefer an aftermarket alternative that still exceeds OEM standards, the WIX Oil Filter (Part Code 57173-EA) is also a compatible option. It features premium media that offers improvements over original equipment manufacturer-branded filters, ensuring your engine remains clean regardless of the brand chosen.
Automatic Transmission Fluid Requirements
The 2008 Lexus GS350 is equipped with an A760H 6-speed automatic transmission. Maintaining this complex system is vital for ensuring smooth shifting and preventing costly repairs. The total fluid capacity for a full fill is 5.2 quarts, while an initial fill requires 1.7 quarts. AMSOIL offers specialized synthetic automatic transmission fluids that are engineered to withstand the rigors of heavy towing, elevated temperatures, and challenging terrain. These fluids remain fluid even in sub-zero temperatures and provide reserve protection during periods of heavy use.
For those seeking the ultimate in transmission protection, the Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid is the top recommendation. It is designed to handle the specific demands of modern transmissions while improving fuel economy. Alternatively, the AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid offers excellent protection against wear and resists harmful sludge, promoting smooth, shudder-free shifts. Both options provide superior oxidation stability compared to conventional fluids, extending the life of the transmission components.
Coolant and Brake Fluid Systems
The cooling system in the GS350 requires 9.6 quarts of antifreeze and coolant. Proper coolant not only prevents the engine from overheating but also protects against rust and corrosion within the cooling passages. The AMSOIL Passenger Car & Light Truck Antifreeze & Coolant is a unique poly-organic acid (OAT) formulation that allows for use in a wide variety of vehicles. It protects all cooling system metals, gaskets, and hoses for up to 150,000 miles or five years. For those who prefer a more eco-friendly option, the AMSOIL Propylene Glycol Antifreeze and Engine Coolant is a concentrated formula that greatly surpasses standards for metallic corrosion and erosion.
For the braking system, maintaining consistent performance is essential for safety. The AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid is recommended for this vehicle. It provides excellent ABS and traction-control responsiveness and maintains a stable viscosity over a wide temperature range, ensuring reliable braking in both hot and cold conditions. This fluid helps eliminate brake fade, a common issue in older vehicles, keeping your stopping power consistent.
Differential and Gear Lubrication
The 2008 Lexus GS350 requires specific gear lubricants for its front and rear differentials. The front differential typically requires a GL-5 fluid, with a capacity of 1.5 pints. Depending on the operating temperature, AMSOIL recommends either the AMSOIL SEVERE GEAR 80W-90 100% Synthetic Gear Lube for standard conditions or the AMSOIL SEVERE GEAR 75W-90 100% Synthetic Gear Lube for colder climates. Both contain friction modifiers for limited-slip applications and control thermal runaway to keep operating temperatures low.
The rear differential also requires 2.9 pints of fluid and is recommended for a 75W-85 viscosity grade. The AMSOIL SEVERE GEAR 75W-85 100% Synthetic Gear Lube is specifically formulated for this application, offering advanced protection against wear and rust. This fluid helps reduce operating temperatures and ensures a long oil, seal, and equipment life, which is crucial for the longevity of the drivetrain components.
Additional Maintenance and Performance
Completing your maintenance regimen with a comprehensive air filter ensures maximum engine efficiency. The WIX Air Filter offers premium media that provides improvements over original equipment manufacturer-branded filters, allowing for better airflow and filtration. Additionally, for owners who store their vehicles seasonally or want to maintain peak fuel performance, the AMSOIL Gasoline Stabilizer helps keep fuel fresh for up to 12 months, protecting against varnish and gum buildup. The AMSOIL P.i. Performance Improver Gasoline Additive can restore up to 14% horsepower and clean GDI fuel injectors to 100% flow rate after just one tank of fuel.
About the Vehicle
The 2008 Lexus GS350 represents a significant point in the history of the GS series, solidifying its reputation as a luxury sports sedan that balances performance with everyday usability. Produced by Toyota’s luxury division, this model is built on the unique platform that underpins several of the era’s most acclaimed performance sedans. The 3.5-liter V6 engine, known internally as the 2GR-FSE, is a Direct Injection port injection hybrid engine that offers impressive power delivery and responsive throttle. This engine was a hallmark of the “Japanese Luxury” movement, designed to compete with European counterparts in terms of driving dynamics and refinement.
Owners of the GS350 often praise its smooth acceleration, precise handling, and high-quality interior materials. The vehicle is known for its durability, with the drivetrain capable of handling thousands of miles of driving with proper care. The 2008 model year features a sophisticated interior with a focus on driver engagement, offering a comfortable ride quality that does not sacrifice handling. The sedan’s aerodynamic design and robust build quality have contributed to its longevity, making it a popular choice for enthusiasts who value a blend of practicality and sportiness. Whether used as a daily commuter or a weekend cruiser, the GS350 remains a beloved vehicle in the automotive community for its reliability and performance characteristics.