Maintaining the 2009 Infiniti FX50 with its powerful 5.0L V8 requires more than just regular maintenance; it demands premium lubricants designed to withstand high temperatures and the unique stresses of a performance luxury crossover. The VK50VE engine is a masterpiece of engineering, but its longevity depends heavily on the quality of AMSOIL Signature Series 5W-30 100% Synthetic Motor Oil, filter, and fluids you choose. Using the wrong viscosity or a conventional fluid can lead to premature wear, reduced fuel economy, and costly repairs down the road. To keep your FX50 performing like new, it is essential to select lubricants that exceed factory specifications.
Recommended AMSOIL Products
- AMSOIL Signature Series 5W-30 100% Synthetic Motor Oil – The ultimate protection with a guaranteed service interval of up to 25,000 miles or one year, offering superior heat resistance and wear protection for the 5.0L engine.
- AMSOIL Extended-Life 5W-30 100% Synthetic Motor Oil – A cost-effective choice that still provides up to 20,000 miles of protection, featuring enhanced cleaning power to keep the engine running smoothly.
- AMSOIL OE 5W-30 100% Synthetic Motor Oil – Ideal for those seeking OEM-mileage performance, formulated to fight sludge and deposits effectively.
- AMSOIL 5W-30 100% Synthetic High-Mileage Motor Oil – Specifically designed for vehicles with over 75,000 miles, featuring enhanced detergents and seal conditioners to reduce leaks and sludge.
- AMSOIL Oil Filter – Provides 99% filtration efficiency at 20 microns, offering greater capacity for contaminants and extended service life to match your synthetic oil.
The 2009 Infiniti FX50 represents the pinnacle of Nissan’s engineering prowess, blending the power of a sports sedan with the utility of a luxury SUV. Under the hood lies the VK50VE, a robust 5.0-liter naturally aspirated V8 engine that produces significant horsepower and torque. This powerplant is designed to deliver smooth, responsive acceleration, yet the high-compression nature of the engine and the heavy vehicle platform it powers create substantial thermal and mechanical loads. Without proper lubrication, these conditions can accelerate wear on critical components like camshafts, piston rings, and valve trains. Using a high-quality synthetic motor oil ensures that the oil maintains its viscosity and protective film even during hard acceleration or in extreme ambient temperatures, protecting the engine’s tight tolerances.
Complete Fluid Specifications for the FX50
Fluid management is a critical aspect of maintaining this vehicle. The oil capacity for a complete change, including the AMSOIL Oil Filter, is 7.1 quarts. This figure is vital for ensuring the engine is neither under-lubricated nor overfilled, both of which can cause damage. The torque specification for the oil drain plug is 25 ft/lbs, and it is always recommended to refill the engine and check the oil level via the dipstick to ensure proper operation.
Transmission and Differential Lubricants
The FX50 is equipped with a 7-speed JR711E automatic transmission. For this gearbox, the total fill capacity is 11.9 quarts. Using a fluid that can withstand the rigors of heavy towing, elevated temperatures, and challenging terrain is crucial for maintaining shift quality and transmission longevity. AMSOIL offers multiple transmission fluid options suitable for this application. For the front differential, which has a capacity of 1.4 pints, and the rear differential, which holds 3.7 pints, a high-quality SEVERE GEAR® 80W-90 100% Synthetic Gear Lube is required to handle GL-5 specifications. Depending on the climate, you can choose between AMSOIL SEVERE GEAR® 75W-90 or SEVERE GEAR® 75W-110 100% Synthetic Gear Lube. These synthetic gear lubes control thermal runaway, protect against rust, and extend the life of seals and equipment. For the transfer case, a capacity of 2.1 pints is required.
For cooling the powerful VK50VE engine, the system requires 11.6 quarts of AMSOIL Passenger Car & Light Truck Antifreeze & Coolant. AMSOIL offers both pre-mixed and concentrated antifreeze options that provide protection up to 150,000 miles or 5 years, ensuring your engine stays cool under the hood. Additionally, maintaining proper brake and steering system performance is essential for a vehicle of this size and speed. AMSOIL DOT 3 and DOT 4 synthetic brake fluid provides excellent ABS responsiveness and a stable viscosity range. For the power steering system, AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid helps reduce friction, keeps seals soft to prevent leaks, and offers strong anti-wear protection.
Additional Protection for the Infiniti FX50
Regular maintenance goes beyond just changing fluids. To further enhance performance, fuel additives like AMSOIL P.i.® Performance Improver can restore horsepower and clean fuel injectors. For seasonal storage, AMSOIL Gasoline Stabilizer keeps fuel fresh for up to 12 months, while Engine Fogging Oil protects internal components from rust during inactivity. A full vehicle care regimen should also include exterior and interior detailers to maintain the luxury aesthetic of the FX50.
Vehicle Background
The 2009 Infiniti FX50 occupies a unique space in the automotive market as a high-performance luxury crossover SUV. Introduced by Nissan’s premium brand, Infiniti, the FX series was designed to bridge the gap between the utility of an SUV and the driving dynamics of a sports car. The FX50 variant specifically was powered by the VK50VE engine, a 5.0-liter V8 that was renowned for its linear power delivery and reliability. Unlike many of its contemporaries that relied heavily on turbocharging, the FX50 offered a naturally aspirated V8 experience, which many enthusiasts appreciated for the smoothness and predictability of the power delivery.
This model year continued the legacy of the FX platform, which is known for its aggressive styling, responsive handling, and spacious interior. The vehicle typically features all-wheel drive as standard, providing confidence in various weather conditions while maintaining a sporty driving character. The combination of the powerful V8 engine and the sophisticated 7-speed automatic transmission made it a favorite among drivers who refused to compromise on performance for the sake of utility. Whether being driven on long highway commutes or navigating city streets, the FX50 stands out for its blend of luxury and capability, making it a cherished vehicle for those who value driving dynamics in a crossover form factor.