While the engine oil is often the first thing owners think about, a complete maintenance regimen for the 2018 Lexus GS F involves addressing every fluid reservoir. The transmission fluid, in particular, needs to be robust enough to handle the demands of an 8-speed automatic gearbox. The AA80E transmission is sensitive to fluid quality, and using a premium synthetic fluid can significantly reduce wear over time. For those who drive aggressively or tow heavy loads, the AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid is an excellent choice. It is engineered to withstand the rigors of elevated temperatures and challenging terrain, remaining fluid even in sub-zero conditions.
For drivers who prioritize a balance between performance and cost, the AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid offers reliable protection against wear. Both options are compatible with the AA80E transmission and are designed to provide smoother shifts and longer service intervals compared to conventional fluids.
The cooling system serves as the vehicle’s lifeline, preventing the 5.0L engine from overheating during intense operation. Whether you choose the AMSOIL Passenger Car & Light Truck Antifreeze & Coolant for its ease of use or the AMSOIL Propylene Glycol Antifreeze and Engine Coolant for its durability, you are choosing a formula that resists corrosion and erosion. The ethylene glycol pre-mix is a convenient 50/50 solution that protects against freezing and boiling, while the concentrated propylene glycol option offers extended protection up to 150,000 miles or five years.
The differential system in the GS F is a critical component for handling the power of the V8 engine. The rear differential requires a GL-5 lubricant, and the 75W-85 viscosity is specified to ensure proper lubrication under heavy loads. The AMSOIL SEVERE GEAR® 75W-85 100% Synthetic Gear Lube is specifically formulated for this application. It contains friction modifiers for limited-slip differentials, which are standard on many performance vehicles, and helps control thermal runaway, keeping operating temperatures lower and extending the life of the gears and seals.
Brake fluid is another often-overlooked component that impacts safety and performance. The 2018 GS F uses DOT 3 fluid. AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid offers excellent responsiveness for both the ABS system and traction control. Its stable viscosity across a wide temperature range ensures that the pedal feel remains consistent, whether you are making a quick stop on a hot summer day or in cold winter conditions.
Oil filter maintenance is equally critical to protect the engine from contaminants. The AMSOIL Oil Filter provides filtering efficiency of 99 percent and offers extended service life, ensuring that clean oil circulates through the high-performance engine.
For fuel system maintenance, the AMSOIL P.i.® Performance Improver Gasoline Additive is highly recommended to restore up to 14% horsepower and clean GDI fuel injectors. Additionally, for seasonal storage of equipment or vehicles not in use, the AMSOIL Gasoline Stabilizer helps keep fuel fresh, while the AMSOIL Engine Fogging Oil protects internal components from rust.
About the Vehicle
The 2018 Lexus GS F is a high-performance luxury sedan that stands out in a market often dominated by European rivals. Introduced as the first vehicle in the dedicated F marque lineup from Lexus, the GS F was designed to deliver a thrilling driving experience without sacrificing the comfort and refinement that the brand is famous for. At the heart of this sedan lies the 2UR-GSE engine, a 5.0-liter naturally aspirated V8 that produces an impressive 467 horsepower and 389 lb-ft of torque. This engine is renowned for its linear power delivery, aggressive exhaust note, and high-revving character, allowing drivers to experience the true essence of driving.
Unlike many of its contemporaries that rely on forced induction, the GS F’s engine is a testament to the power of displacement and precision engineering. The 5.0L V8 features VVT-iE on the intake camshaft and VVT-i on the exhaust camshaft, optimizing valve timing for both low-end torque and high-rpm power. The powertrain is mated to a ZF-sourced 8-speed automatic transmission, which features paddle shifters and a “Sport S+” mode that sharpens throttle response and alters shift logic for a more engaging drive. The vehicle also comes standard with a Torsen® limited-slip rear differential, which enhances traction and handling dynamics, making the GS F a capable track-day machine as well as a comfortable daily driver.
One of the defining characteristics of the GS F is its balance. It offers the handling agility of a sports car with the quiet, plush ride quality expected of a luxury flagship. The interior is crafted with premium materials, including perforated leather seats and Alcantara surfaces, while the exterior features bold styling cues like the spindle grille, LED headlights, and functional aerodynamics. The GS F is not just a fast car; it is a well-rounded performance sedan that appeals to enthusiasts who appreciate both speed and sophistication.
Despite its robust engineering, the GS F, like any high-performance vehicle, can benefit from meticulous maintenance to address common wear points. One issue that owners of high-horsepower engines may encounter is carbon buildup on intake valves, particularly in vehicles with direct injection technology. The high-revving nature of the 2UR-GSE engine can lead to faster accumulation of carbon deposits, which can degrade performance and fuel economy. Using a fuel system cleaner like AMSOIL P.i.® Performance Improver can help restore injector flow and reduce carbon accumulation, maintaining engine efficiency.
Another potential concern is the stress placed on the brake system during spirited driving. Over time, brake fluid can absorb moisture, lowering its boiling point and leading to a spongy pedal feel or brake fade. Regular replacement with a synthetic DOT 3 fluid, such as the one mentioned earlier, helps mitigate this risk. Additionally, the engine’s high output requires oil that can withstand thermal breakdown. While the factory recommendation is solid, using an oil with superior resistance to volatility and shear, like the AMSOIL Signature Series 5W-30 100% Synthetic Motor Oil, provides an added layer of security against oil consumption and wear, extending the life of the engine’s internal components. By addressing these potential issues with premium fluids and additives, owners can keep their GS F running at peak performance for years to come.
In conclusion, the 2018 Lexus GS F is a marvel of automotive engineering that deserves the best in protection. From the high-performance V8 engine to the precision-tuned transmission and differential, every component benefits from the use of top-tier lubricants. Whether you are navigating daily commutes or pushing the vehicle to its limits on a weekend drive, choosing the right fluids ensures that the GS F continues to deliver the exceptional driving dynamics and luxury experience it was built to provide.