Keeping your 1997 Lexus GS300 running smoothly requires more than just a periodic visit to the service bay; it demands the use of the correct synthetic lubricants tailored to its specific 3.0L 6-cylinder engine and transmission systems. This vehicle, equipped with the renowned 2JZ-GE engine code, is designed for precision and durability, and it rewards owners who use high-performance fluids. Using the right motor oil, transmission fluid, and coolants ensures that the engine operates within its optimal temperature range, reduces wear on internal components, and maintains fuel efficiency over the vehicle’s long lifespan.
Recommended AMSOIL Products
- AMSOIL Signature Series 5W-30 100% Synthetic Motor Oil – Provides unsurpassed engine protection for up to 25,000 miles or one year, offering the highest level of wear protection against horsepower loss and sludge.
- AMSOIL Extended-Life 5W-30 100% Synthetic Motor Oil – Delivers extended protection for up to 20,000 miles with enhanced cleaning power to keep the engine running smoother and longer.
- AMSOIL OE 5W-30 100% Synthetic Motor Oil – An oil change that outperforms conventional oils, featuring a 100% synthetic formulation that fights sludge and deposits effectively.
- AMSOIL 5W-30 100% Synthetic High-Mileage Motor Oil – Formulated for vehicles with over 75,000 miles, featuring boosted detergents and anti-wear additives to reduce sludge by 67%.
- AMSOIL Oil Filter – Delivers 99% filtering efficiency at 20 microns, allowing lower restriction to keep engine parts lubricated and offering extended service life.
- WIX Oil Filter – A premium aftermarket option with media improvements over original equipment manufacturer-branded filters.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A unique poly-organic acid formulation providing protection up to 150,000 miles or 5 years for the cooling system.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated option that must be mixed with water, offering superior protection against corrosion and erosion for up to 150,000 miles.
- AMSOIL Signature Series Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – Withstands heavy towing, elevated temperatures, and remains fluid in sub-zero conditions for the A350E transmission.
- AMSOIL OE Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – Protects against wear and sludge while promoting smooth, shudder-free shifts in the automatic transmission.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Ensures excellent ABS and traction-control responsiveness with stable viscosity over a wide temperature range.
- AMSOIL SEVERE GEAR® 80W-90 100% Synthetic Gear Lube – Ideal for GL-5 rear differentials, controlling thermal runaway and reducing operating temperatures.
- AMSOIL SEVERE GEAR® 75W-90 100% Synthetic Gear Lube – Advanced protection against wear for differentials requiring lighter viscosity grades in colder climates.
- AMSOIL SEVERE GEAR® 75W-110 100% Synthetic Gear Lube – Designed for heavy-duty applications where extra viscosity is needed for optimal gear protection.
The engine oil is the lifeblood of your Lexus GS300. For the 3.0L 6-cylinder engine, the recommended viscosity is SAE 5W-30. The oil capacity for a complete change, including the filter, is 5.7 quarts. When performing an oil change, it is critical to ensure the oil drain plug is torqued to 33 ft/lbs to prevent leaks and damage. While AMSOIL Synthetic Motor Oils are the preferred solution, the AMSOIL OE 5W-30 100% Synthetic Motor Oil is also a robust choice for those seeking to match original specifications while enjoying the benefits of full synthetic technology. For engines exceeding 75,000 miles, the AMSOIL 5W-30 100% Synthetic High-Mileage Motor Oil features unique chemistry designed to reduce sludge and boost detergents.
Transmission and Cooling Systems
The 1997 Lexus GS300 utilizes an A350E automatic transmission. Proper fluid selection is vital to prevent wear and costly repairs. The total fill capacity for the transmission is 8.6 quarts, with an initial fill requirement of 2 quarts. AMSOIL offers two primary options for this application. The AMSOIL Signature Series Multi-Vehicle 100% Synthetic Automatic Transmission Fluid is engineered to withstand the rigors of heavy towing, elevated temperatures, and challenging terrain. Alternatively, the AMSOIL OE Multi-Vehicle 100% Synthetic Automatic Transmission Fluid provides excellent cold-weather performance and guards against leaks, promoting smooth, shudder-free shifts.
Cooling is another critical aspect of maintaining the performance of this Japanese sedan. The engine cooling system requires a fluid capacity of 7.9 quarts. AMSOIL Passenger Car & Light Truck Antifreeze & Coolant is a 50/50 pre-mix formulation that protects all cooling system metals, gaskets, and hoses. It is phosphate-, nitrate-, nitrite-, silicate-, borate-, and amine-free, making it compatible with a wide variety of vehicles. For those who prefer a concentrated solution, the AMSOIL Propylene Glycol Antifreeze and Engine Coolant requires mixing with distilled water and offers protection up to 150,000 miles or 5 years, greatly surpassing standards for metallic corrosion and erosion.
Brakes and Differentials
Maintaining braking safety is paramount. The hydraulic AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid system in this vehicle is designed for DOT 3 fluid. It provides a stable viscosity over a wide temperature range, ensuring excellent ABS and traction-control responsiveness. This synthetic fluid helps prevent the boil points associated with conventional brake fluids, enhancing safety during hard stops.
For the rear differential, which requires a GL-5 fluid, the capacity is 2.9 pints. The appropriate viscosity depends on the ambient temperature. For conditions above -18°C, an 80W-90 AMSOIL SEVERE GEAR® 80W-90 100% Synthetic Gear Lube is suitable. For temperatures below -18°C, a 75W-90 or 75W-110 grade may be required. The AMSOIL SEVERE GEAR® 75W-90 100% Synthetic Gear Lube and AMSOIL SEVERE GEAR® 75W-110 100% Synthetic Gear Lube offer advanced protection against wear, control thermal runaway, and help reduce operating temperatures. These lubricants also contain friction modifiers for limited-slip applications, ensuring long oil and seal life.
Maintaining Fluid Integrity
Beyond the primary lubrication points, several additional fluids contribute to the vehicle’s overall health. The power steering system, which operates on DEXRON-III automatic transmission fluid, can benefit from the AMSOIL Signature Series Multi-Vehicle 100% Synthetic Automatic Transmission Fluid to reduce leaks and improve shifting smoothness. For seasonal storage or periods of inactivity, AMSOIL Gasoline Stabilizer helps keep fuel fresh for up to 12 months, protecting against varnish and gum buildup. Similarly, the AMSOIL Engine Fogging Oil is a highly effective rust preventive designed to protect internal engine components during long periods of storage.
Using high-quality additives and cleaners further enhances the longevity of your Lexus. The AMSOIL P.i.® Performance Improver Gasoline Additive can restore up to 14% horsepower and clean GDI fuel injectors to a 100% flow rate after just one tank of fuel. It also helps prevent carbon buildup and reduces the need for higher-octane fuel. For exterior maintenance, the AMSOIL Miracle Wash Waterless Wash and Wax Spray provides a fantastic shine and UV protection, while the AMSOIL High-Foam Car Shampoo offers a gentle yet effective cleaning action for the vehicle’s paint.
About the Vehicle
The 1997 Lexus GS300 represents a pinnacle of engineering from the late 1990s, embodying the blend of performance and luxury that defined the brand’s rise in the North American market. As part of the second generation of the GS series (X20 platform), this sedan was designed to compete directly with European luxury sports sedans, offering a driving dynamic that was both refined and engaging. Under the hood lies the legendary 2JZ-GE engine, a 3.0-liter naturally aspirated inline-six known for its robust construction and smooth power delivery. This engine family, often associated with high-revving performance and durability, provides a reliable foundation that has garnered a loyal following among enthusiasts and daily drivers alike.
Owners of the 1997 GS300 appreciate its balanced handling characteristics, achieved through a nearly perfect weight distribution and a sophisticated suspension setup. The interior reflects the luxury standards of the era, featuring high-quality materials, ergonomic design, and advanced features for its time. Whether used as a daily commute vehicle or a weekend cruiser, the GS300 maintains a reputation for exceptional reliability and long-term value. Its reputation as a “sleeper”—a car that looks unassuming but performs significantly—is well-earned. The vehicle’s longevity is often attributed to the robustness of its drivetrain and the simplicity of its mechanical design, which allows for effective maintenance using the correct synthetic lubricants. By adhering to a rigorous maintenance schedule with premium fluids, owners can ensure that this classic sedan continues to deliver a smooth, responsive, and comfortable ride for years to come.