The 2007 Infiniti FX45 is a luxury crossover SUV that demands premium lubrication to maintain its performance and longevity. Powered by the robust VK45DE 4.5L V8 engine, this vehicle benefits significantly from the use of high-quality synthetic fluids. Proper maintenance not only ensures smooth operation but also protects vital components against the wear and tear of daily driving, heavy loads, and extreme temperatures. Selecting the right motor oil, filter, and fluids is essential for keeping this high-revving engine running at its best.
Recommended AMSOIL Products
- AMSOIL Signature Series 5W-30 100% Synthetic Motor Oil – Offers unsurpassed engine protection for up to 25,000 miles, providing 75% more protection against horsepower loss and wear.
- AMSOIL Extended-Life 5W-30 100% Synthetic Motor Oil – Delivers extended-life protection for up to 20,000 miles with 37% more cleaning power to keep the engine running smoother.
- AMSOIL OE 5W-30 100% Synthetic Motor Oil – An excellent option that outperforms conventional oils, designed to fight sludge and deposits effectively.
- AMSOIL 5W-30 100% Synthetic High-Mileage Motor Oil – Specifically formulated for vehicles with over 75,000 miles, featuring a boosted detergent package and reduced sludge by 67%.
- AMSOIL Oil Filter – Provides 99 percent filtering efficiency at 20 microns and offers extended service life compared to standard filters.
- WIX Oil Filter – A premium alternative that offers improvements over OEM-branded filters with superior media for better filtration.
- AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Withstands heavy towing, elevated temperatures, and provides reserve protection during challenging terrain.
- AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Protects against wear and promotes smooth, shudder-free shifts while resisting sludge.
- AMSOIL SEVERE GEAR® 80W-90 100% Synthetic Gear Lube – Provides advanced protection against wear, controls thermal runaway, and includes friction modifiers for limited-slip applications.
- AMSOIL SEVERE GEAR® 75W-90 100% Synthetic Gear Lube – A versatile choice that helps reduce operating temperatures and extends oil, seal, and equipment life.
- 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 100% Synthetic Multi-Vehicle Power Steering Fluid – Reduces friction and helps seals remain soft to prevent leaks while resisting heat for long fluid life.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A unique OAT formulation offering protection up to 150,000 miles or 5 years, compatible with all cooling system metals.
Engine Oil and Filter Specifications
When maintaining the 4.5L V8 engine found in the 2007 Infiniti FX45, viscosity and quality are paramount. The manufacturer recommends SAE 5W-30 motor oil suitable for all temperature conditions. For this specific engine, the required fluid capacity is 6.1 quarts when changing the oil along with the filter. It is crucial to check the oil level after refilling and ensure the oil drain plug is torqued to the correct specification of 25 ft/lbs to prevent leaks.
For owners seeking maximum protection, AMSOIL Signature Series 5W-30 100% Synthetic Motor Oil is the top-tier choice. It is engineered to provide superior protection against horsepower loss and wear, outperforming industry standards. Drivers who prefer a longer interval between changes without compromising quality will find the Extended-Life 5W-30 option ideal, offering up to 20,000 miles of protection. This fluid contains 37% more cleaning power, which helps keep the engine components running smoother for longer. For those who want to outperform conventional oils with a formulation that closely mimics factory fill but offers better performance, the AMSOIL OE 5W-30 is an excellent alternative. It fights sludge and deposits effectively using 100% synthetic formulation technology.
Vehicles with significant mileage, specifically those exceeding 75,000 miles, benefit from AMSOIL 5W-30 100% Synthetic High-Mileage Motor Oil. This product features a unique chemistry with boosted detergents and dispersants to reduce sludge by 67%, demonstrating significant cleaning power that helps engines last longer. It also includes enhanced anti-wear additives to protect critical engine parts.
Matching the oil with a high-quality filter is equally important. The AMSOIL Oil Filter provides a filtering efficiency of 99 percent at 20 microns. It allows for lower restriction, ensuring engine parts stay lubricated, and holds a greater capacity for small, wear-causing contaminants compared to competing filters. For those who prefer a well-known aftermarket brand, the WIX Oil Filter is also a viable option, offering premium media that improves upon original equipment manufacturer standards.
Transmission and Differential Lubrication
The 2007 Infiniti FX45 is equipped with an automatic transmission (RE5R05A) that requires specific fluid characteristics to handle the torque and stress of the 4.5L engine. For a complete fluid fill, the capacity is 10.9 quarts. AMSOIL offers two primary choices for this application. The Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid is designed to withstand the rigors of heavy towing, elevated temperatures, and challenging terrain while remaining fluid in sub-zero conditions. Alternatively, the AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid provides robust protection against wear and promotes smooth, shudder-free shifts, making it a reliable choice for everyday driving.
For the differentials, the vehicle requires GL-5 rated lubricants. The front differential requires 1.4 pints of AMSOIL SEVERE GEAR® 80W-90 100% Synthetic Gear Lube. It contains friction modifiers specifically for limited-slip applications and helps reduce operating temperatures while protecting against rust and corrosion. The rear differential requires 3 pints. For those who prefer a slightly lighter viscosity for better cold-weather performance, AMSOIL SEVERE GEAR® 75W-90 is an excellent alternative that still offers advanced protection and thermal runaway control. AMSOIL SEVERE GEAR® 75W-110 is also a robust option for heavy-duty protection.
If the vehicle is equipped with a transfer case, the capacity is approximately 2.5 pints. For this component, AMSOIL Signature Series Multi-Vehicle 100% Synthetic Automatic Transmission Fluid is suitable. It provides the necessary protection for the transfer case’s internal components, ensuring reliable operation in various driving conditions. Alternatively, AMSOIL OE Multi-Vehicle 100% Synthetic Automatic Transmission Fluid provides excellent protection against wear and sludge.
Cooling, Braking, and Other Fluids
Maintaining the cooling system is vital for the longevity of the VK45DE engine. The system capacity is 10.6 quarts. AMSOIL Passenger Car & Light Truck Antifreeze & Coolant is a top choice, featuring a unique OAT formulation that protects all cooling system metals, gaskets, and hoses. It is a 50/50 pre-mix, which means it is ready to use, and offers protection for up to 150,000 miles or 5 years. For those who prefer a concentrated formula to mix themselves, AMSOIL Propylene Glycol Antifreeze and Engine Coolant provides extended protection up to 150,000 miles and is phosphate-, nitrate-, and silicate-free.
Brake safety is critical in any luxury vehicle. The 2007 Infiniti FX45 uses hydraulic brake fluid. AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid is recommended to ensure excellent ABS and traction-control responsiveness. It maintains a stable viscosity across a wide temperature range, providing consistent braking performance in both hot and cold weather.
For the power steering system, the vehicle utilizes fluid type PS042. AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid is designed to reduce friction and keep seals soft to prevent leaks. It offers strong anti-wear protection and excellent high-temperature performance, ensuring quiet operation of the steering system.
About the Vehicle
The 2007 Infiniti FX45 represents a unique chapter in the history of luxury crossovers. As one of the first vehicles to define the sport crossover segment, it blended the dynamic driving characteristics of a sedan with the utility and presence of an SUV. The FX45 was powered by the legendary Nissan VK45DE 4.5-liter V8 engine, a powerplant known for its high-revving nature and smooth power delivery. This engine produces a substantial amount of horsepower, allowing the relatively heavy crossover to achieve acceleration figures that rival many sports cars of the era. The vehicle rides on Infiniti’s advanced suspension systems, which were tuned to provide a compliant yet responsive ride quality.
Owners of the FX45 appreciate its aggressive styling, which features a bold front grille and sleek, coupe-like roofline. Inside, the cabin was designed with premium materials, offering a comfortable and driver-focused environment. The FX45 was part of Infiniti’s effort to capture buyers who wanted performance without sacrificing practicality. It became a favorite among enthusiasts who valued its raw V8 power and all-wheel-drive capability, which provided confidence in various weather conditions.
Despite its robust build, the 2007 FX45 can encounter specific issues as it ages. One common concern is excessive oil consumption, which can be attributed to the engine’s high-revving design and seal hardening over time. Using a high-mileage synthetic motor oil formulated with seal conditioners can help mitigate this issue and restore proper oil control. Another potential problem involves the transmission shifting smoothly, as the RE5R05A transmission can sometimes develop shuddering or delayed shifts if the fluid degrades. Regular fluid changes with a high-quality synthetic transmission fluid can restore shift quality and protect the internal clutches. Additionally, the cooling system can be prone to leaks or corrosion in the radiator or hoses over time. Using a high-quality antifreeze with superior corrosion inhibitors can help preserve the integrity of the cooling system components. Finally, some owners report issues with the transfer case or differential seals leaking, particularly if the vehicle is driven in harsh conditions. Switching to a synthetic AMSOIL SEVERE GEAR® 75W-110 100% Synthetic Gear Lube with superior leak-prevention properties and better thermal stability can significantly extend the life of these seals and prevent fluid loss.
By addressing these potential problem areas with the correct AMSOIL synthetic products, owners can ensure their Infiniti FX45 remains a reliable and powerful driving companion for years to come. The use of premium lubricants helps maintain the vehicle’s performance characteristics while protecting against the wear and tear associated with its high-performance nature.
Seasonal and Storage Products
For those who use their Infiniti FX45 seasonally or need to prepare their vehicle for long-term storage, AMSOIL offers specialized products. The AMSOIL Gasoline Stabilizer helps keep fuel fresh for up to 12 months, preventing varnish and gum buildup caused by ethanol corrosion. This is ideal for seasonal equipment or vehicles that may sit idle for extended periods. Additionally, the AMSOIL Engine Fogging Oil is designed to protect internal engine components from rust during storage or long periods of inactivity, making it suitable for engines that will not be started for a while.
Regular maintenance and the use of quality fluids ensure that the 2007 Infiniti FX45 continues to perform as intended. Whether you are looking for maximum protection, extended service intervals, or specific solutions for high-mileage vehicles, AMSOIL offers a comprehensive range of products tailored to the needs of this sophisticated vehicle.