Maintaining the longevity and performance of your 2018 Infiniti Q50 equipped with the 2.0L turbocharged four-cylinder engine starts with choosing the right lubricants. This compact powerhouse relies on precise fluid specifications to handle the added stress of forced induction, high-temperature operation, and frequent stop-and-go traffic typical of urban driving. Using the correct oil viscosity and premium synthetic fluids ensures that critical components remain protected against wear, sludge buildup, and thermal breakdown. Whether you are extending your oil change intervals or simply seeking superior protection during extreme weather conditions, following the manufacturer’s capacity requirements while upgrading to high-performance AMSOIL 5W-40 FS synthetics is the smartest approach for vehicle owners.
Recommended AMSOIL Products
For the 2018 Infiniti Q50 2.0L engine, AMSOIL 5W-40 FS and AMSOIL 0W-40 FS offer two distinct motor oil formulations designed specifically for the unique demands of European vehicles. These oils provide exceptional thermal stability and wear protection that exceeds standard industry limits.
- AMSOIL 5W-40 FS 100% Synthetic European Motor Oil – A premium European formula featuring a precise blend of synthetic base oils and premium additives, specifically designed to protect engines from high-heat stress and sludge formation.
- AMSOIL 0W-40 FS 100% Synthetic European Motor Oil – An extended-life synthetic option offering superior cold-flow properties for easier starting in low temperatures while maintaining film strength during hot running conditions.
In addition to engine oil, your Q50 requires specific antifreeze formulations to manage the cooling system’s capacity and protect against corrosion. The vehicle’s radiator and cooling system benefit from AMSOIL Passenger Car & Light Truck Antifreeze & Coolant and AMSOIL Propylene Glycol Antifreeze‘s unique poly-organic acid (OAT) formulations, which are compatible with a wide variety of vehicle metals and do not contain harmful silicates or borates.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A ready-to-use, ethylene glycol 50/50 pre-mix that provides protection for up to 150,000 miles or 5 years, ensuring the cooling system operates efficiently in both freezing and boiling temperatures.
Transmission and Differential Lubrication
The 2018 Infiniti Q50 comes with a 7-speed automatic transmission (RE7R01A) that demands high-quality fluid to ensure smooth shifts and longevity. AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid and AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid are engineered to withstand the rigors of heavy towing, elevated operating temperatures, and challenging terrain. These fluids remain fluid in sub-zero temperatures and provide reserve protection during heavy use, preventing the shudder and wear common in traditional fluids.
For the front and rear differentials, the vehicle requires GL-5 rated gear lubricants. The Q50’s differential system benefits significantly from extreme pressure (EP) additives in AMSOIL SEVERE GEAR 80W-90, AMSOIL SEVERE GEAR 75W-90, AMSOIL SEVERE GEAR 75W-110, and AMSOIL 75W-90 Long Life 100% Synthetic Gear Lube, which control thermal runaway and protect against rust and corrosion. These gear lubes help reduce operating temperatures and extend the life of seals and equipment, a critical feature for the limited-slip applications often found in Infiniti drivetrains.
- AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Designed to withstand heavy towing and elevated temperatures, this fluid provides reserve protection during abuse and maintains viscosity for smooth shifting.
- AMSOIL Signature Series Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – A versatile multi-vehicle fluid also recommended for transfer cases and differentials, offering excellent cold-weather performance.
- AMSOIL OE Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – Provides OE-level protection with excellent cold-weather performance and guards against leaks.
- AMSOIL SEVERE GEAR 80W-90 100% Synthetic Gear Lube – Contains friction modifiers for limited-slip applications, offering advanced protection against wear and helping to reduce operating temperatures.
- AMSOIL SEVERE GEAR 75W-90 100% Synthetic Gear Lube – A versatile synthetic gear lube that controls thermal runaway and protects against rust, ideal for the rear differential of this vehicle.
- AMSOIL SEVERE GEAR 75W-110 100% Synthetic Gear Lube – Offers extended protection for heavy-duty and limited-slip applications with high extreme pressure resistance.
- AMSOIL 75W-90 Long Life 100% Synthetic Gear Lube – Specifically engineered for long service life, offering improved seal life and better cold-weather shifting.
- 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, ensuring safe braking performance in all conditions.
When performing maintenance on your Infiniti Q50, adhering to the correct capacities is vital. The engine oil system requires approximately 6.7 to 7 quarts depending on the specific filter installed, with the drain plug torque set to 30 ft/lbs. The transmission requires a full fill of about 10.7 quarts for the 7-speed automatic unit. The front differential holds roughly 1.4 pints, while the rear differential requires 2.2 pints. The cooling system capacity is 9.5 quarts. Regularly checking fluid levels and replacing them with high-performance AMSOIL products ensures that every component remains lubricated and protected, reducing the risk of catastrophic failure and extending the service life of the vehicle.
About the Vehicle
The 2018 Infiniti Q50 represents a significant milestone in the Japanese luxury automaker’s history of producing performance-oriented sedans. As a compact executive sedan, the Q50 is built on the platform known for its balance of handling dynamics and ride comfort, serving as a direct competitor to established names in the luxury sedan market. The vehicle is characterized by its aggressive styling, which includes a bold grille and sharp lines, reflecting the brand’s commitment to a modern and dynamic aesthetic.
Under the hood, the 2018 model year offers a distinct powertrain choice for the 2.0L 4-cylinder engine. This engine code, often referred to as the VC-Turbo or a variant thereof, utilizes advanced turbocharging technology to deliver power that punches well above its displacement class. The engine produces a commendable amount of horsepower, making the vehicle surprisingly spirited for a non-V6 model. The turbocharged setup allows for quick acceleration, though it does place specific demands on the lubrication system due to the high thermal and mechanical loads generated during turbo operation. Owners appreciate the Q50 for its responsive steering and the engaging driving character that distinguishes it from more sedate luxury rivals.
Despite its robust engineering, the 2018 Infiniti Q50 is not without its challenges, particularly regarding the maintenance of its turbocharged systems. One common issue observed in turbocharged vehicles of this era is carbon buildup on the intake valves, which can occur more rapidly in direct injection engines or those subjected to frequent short trips. This buildup can degrade performance and fuel economy over time. Using AMSOIL P.i. Performance Improver Gasoline Additive and AMSOIL Upper Cylinder Lubricant Corrosion Inhibitor helps restore injectors and prevent carbon formation. Regular fluid changes with high-quality synthetics help mitigate risks associated with AMSOIL 5W-40 FS and AMSOIL 0W-40 FS losing their viscosity stability. Additionally, applying AMSOIL Silicone Spray can help protect rubber components from drying and cracking.
Another potential concern for Q50 owners involves the 7-speed automatic transmission. Some drivers have reported shudder or hesitation issues, particularly during low-speed maneuvers. This can sometimes be exacerbated by fluid that has degraded or contains metal shavings from normal wear. Using a synthetic transmission fluid like AMSOIL Signature Series Fuel-Efficient with strong friction modifiers and thermal stability can help smooth out these shifts. Furthermore, the differential and gear components can experience thermal stress, especially if the vehicle is driven aggressively. Synthetic gear lubes like AMSOIL SEVERE GEAR 75W-90 are essential for preventing wear in the limited-slip differentials common to this platform. Finally, the cooling system must be robust to handle the heat output of the turbocharged engine; a failure in the AMSOIL Passenger Car & Light Truck Antifreeze & Coolant can lead to rapid overheating and severe engine damage. Applying AMSOIL Heavy-Duty Metal Protector to undercarriage components can offer additional protection against salt and moisture corrosion.
By addressing these specific needs with the correct AMSOIL products, owners can significantly enhance the reliability and driving experience of their 2018 Infiniti Q50. The combination of superior fluid protection, extended service intervals, and targeted formulations for turbocharged engines makes AMSOIL a preferred choice for those who want the best from their vehicle. For seasonal storage, consider using AMSOIL Gasoline Stabilizer to keep fuel fresh and AMSOIL Engine Fogging Oil to protect internal components during periods of inactivity. Regularly cleaning the vehicle with AMSOIL Brake and Parts Cleaner, AMSOIL Miracle Wash Waterless Wash and Wax Spray, and AMSOIL Exterior Ceramic Spray ensures that both the exterior and mechanical systems remain in pristine condition.