The heart of the 2007 Lexus GS350 is the 2GR-FSE engine, a direct-injection V6 that benefits greatly from the stability of synthetic motor oil. The manufacturer recommends SAE 5W-30 for optimal performance across all temperatures. The engine oil capacity is 6.7 quarts with a filter change, or 6.8 quarts total. This slight variation highlights the importance of checking the dipstick after refilling to ensure the correct level is reached.
When selecting an oil, AMSOIL Signature Series 5W-30 stands out as the top choice for maximum protection. It offers 75% more engine protection against horsepower loss and wear compared to conventional oils, and can extend service intervals to 25,000 miles. For owners who prefer a balance of performance and value, AMSOIL OE 5W-30 provides excellent protection while meeting OEM specifications. If your vehicle has surpassed 75,000 miles, the AMSOIL 5W-30 High-Mileage formula is the ideal selection, featuring enhanced detergents and seal conditioners to reduce sludge and oil consumption.
Filtration is equally critical. The engine requires a high-capacity filter to trap small wear-causing contaminants. The AMSOIL Oil Filter is engineered to allow lower restriction, keeping parts lubricated and providing greater capacity for contaminants than competing brands. Alternatively, the WIX Oil Filter offers premium media that improves upon standard OEM filters, ensuring debris is captured effectively to prolong engine life.
Transmission and Differential Fluids
The GS350 typically comes equipped with a 6-speed automatic transmission (A760H). Proper fluid management here is crucial for maintaining smooth shifting and preventing wear. The total fill capacity for this transmission is 5 quarts, with an initial fill of approximately 1.7 quarts. Using AMSOIL Signature Series Fuel-Efficient Automatic Transmission Fluid ensures the fluid remains stable even under the rigors of heavy towing, elevated temperatures, and challenging terrain. It is designed to withstand the heat generated by the transmission while maintaining fluidity in sub-zero conditions.
The AMSOIL OE Fuel-Efficient Automatic Transmission Fluid is another robust option that protects against wear and resists sludge buildup, promoting smooth, shudder-free shifts. For those maintaining an AWD model, the front differential requires a specific lubricant. The capacity for the front differential is 1.5 pints, while the rear differential on RWD models holds 2.9 pints. Both front and rear differentials require GL-5 rated lubricants. AMSOIL SEVERE GEAR® 80W-90 is the recommended choice for these applications, providing advanced protection against wear, controlling thermal runaway, and reducing operating temperatures. For colder climates, AMSOIL SEVERE GEAR® 75W-90 or 75W-110 offers the same superior protection with improved low-temperature flow.
Coolant, Brakes, and Seasonal Care
Keeping the cooling system healthy is vital for the longevity of the V6 engine. The 2007 GS350 requires 9.6 quarts of coolant. AMSOIL Passenger Car & Light Truck Antifreeze & Coolant is a phosphate- and silicate-free formulation that protects all cooling system metals, gaskets, and hoses. It offers 150,000 miles of protection and is compatible with all other antifreeze colors. For those needing a concentrated solution, the AMSOIL Propylene Glycol Antifreeze and Engine Coolant allows for mixing with distilled water to create a custom protective solution.
Braking performance relies on the stability of the AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid. The system uses DOT 3 hydraulic fluid. It provides excellent ABS and traction-control responsiveness. Its stable viscosity ensures consistent pedal feel over a wide temperature range, which is critical for safety. Additionally, power steering systems in this vehicle can benefit from using a multi-vehicle synthetic automatic transmission fluid, such as the AMSOIL Signature Series Multi-Vehicle or OE versions, which resist heat and provide smooth operation.
About the Vehicle
The 2007 Lexus GS350 represents a pinnacle of refinement in the executive sedan segment. Built on the GA-L platform heritage, it combines the reliability of Toyota engineering with the luxury appointments expected of the Lexus brand. Under the hood lies the 2GR-FSE engine, a 3.5-liter V6 renowned for its balance of power and efficiency. This engine produces approximately 292 horsepower, offering brisk acceleration without the excessive fuel consumption of larger displacement engines.
Owners of this model often praise the GS350 for its smooth ride quality, precise handling, and quiet cabin. The suspension is tuned to absorb road imperfections while maintaining driver control, making it an ideal companion for both daily commuting and spirited weekend drives. The interior is crafted with high-quality materials, featuring leather upholstery, wood trim, and a driver-centric layout that emphasizes ergonomics. Despite being a luxury vehicle, it shares many mechanical components with the Toyota Camry and Toyota Crown, contributing to its reputation for low maintenance costs and high durability.
While the GS350 is a dependable vehicle, there are common issues that can arise over time, particularly as the car accumulates mileage. One frequent concern is sludge buildup in the engine, especially if oil change intervals were neglected or if the vehicle was used for frequent short trips. The 2GR-FSE engine is sensitive to oil quality, and sludge can restrict oil passages, leading to increased wear on the variable valve timing system. Using high-quality synthetic oil with superior detergents is the best way to combat this and keep the engine clean.
Another issue is transmission shudder or hesitation, particularly in early models or those with higher mileage. This is often caused by degraded fluid or sludge accumulation in the valve body. Switching to a high-performance synthetic transmission fluid can help condition seals and flush out contaminants, restoring smooth shift feel. Additionally, the cooling system on these vehicles can suffer from corrosion or gasket failure over time if the coolant is not replaced regularly. Ethylene glycol-based coolants degrade, losing their anti-corrosion properties, which can lead to overheating. Regular fluid changes with a high-quality, phosphate-free coolant prevent this. Finally, some owners report brake fade or reduced responsiveness due to moisture absorption in the brake fluid, which lowers the boiling point. Synthetic brake fluids, which resist moisture absorption far better than conventional DOT 3 fluid, provide a significant improvement in braking consistency and safety, addressing this common wear point effectively.