Choosing the right viscosity and type of motor oil is the first step in preserving the health of your VQ35HR engine. This engine, known for its variable valve timing and high-revving capabilities, benefits significantly from 5W-30 synthetic oil. The oil capacity for this engine is 5.2 quarts when changing the filter as well. It is critical to check the oil level after refilling to ensure proper lubrication coverage. The drain plug torque specification should be set between 22 and 29 ft/lbs to prevent leaks or stripped threads. For those looking for the ultimate level of protection, the AMSOIL Signature Series offers the longest change intervals, while the High-Mileage variant is ideal for vehicles that have accumulated over 75,000 miles on the odometer.
Beyond the engine, the transmission system requires dedicated attention. The 2008 Infiniti EX35 utilizes a 5-speed automatic transmission (RE5R05A) that demands a specific fluid to ensure smooth gear engagement. The total fill capacity for this transmission is 10.9 quarts. Using a high-quality synthetic transmission fluid helps manage the heat generated during acceleration and towing, preventing sludge buildup that can lead to shuddering or premature failure. Whether you choose the fuel-efficient formula for maximum economy or the OE formula for a balance of performance and cost, these fluids are engineered to exceed the rigors of daily driving.
Maintenance for the Differential and Cooling System
The differential and transfer case components also rely on proper lubrication to handle torque distribution. The front differential requires 1.4 pints of lubricant, while the rear differential needs 3 pints. For the transfer case, the capacity is listed as 2.7 pints. Gear lubes in the 75W-90, 80W-90, or 75W-110 ranges are suitable depending on the specific application and ambient temperatures. These synthetic gear lubes contain friction modifiers that are essential for limited-slip differentials to operate quietly and effectively. They also help control thermal runaway, a condition where friction generates excessive heat that degrades the fluid and damages gears.
Cooling system maintenance is equally important to prevent overheating, which can warp cylinder heads and cause catastrophic engine failure. The 2008 Infiniti EX35 holds 9.1 quarts of coolant. Owners can choose between a convenient 50/50 pre-mixed antifreeze or a concentrated propylene glycol formula. The pre-mix is ready to use and offers protection against corrosion for metals, gaskets, and hoses. The concentrated option allows for customization of freeze protection points and offers extended service intervals for heavy-duty applications. Both options are phosphate, nitrate, and silicate-free, ensuring compatibility with the vehicle’s cooling system materials.
Finally, do not overlook the fluids that keep the driver safe and the vehicle clean. The brake system relies on DOT 3 and DOT 4 synthetic brake fluid to maintain pedal feel and ABS functionality in wet or extreme conditions. Power steering systems benefit from a dedicated synthetic power steering fluid that keeps seals pliable and reduces noise. For fuel system care, additives like AMSOIL P.i. can restore horsepower and clean fuel injectors, ensuring the 3.5L V6 gets the fuel it needs for optimal combustion.
About the Vehicle
The 2008 Infiniti EX35 represents a unique niche in the luxury automotive market. Introduced as a compact luxury crossover, it blends the dynamic handling of a sports sedan with the utility and higher ride height of an SUV. Under the hood lies the legendary VQ35HR 3.5-liter V6 engine, a descendant of the award-winning VQ series that powered many Nissan and Infiniti vehicles for decades. This engine is celebrated for its linear power delivery, high-revving nature, and relative simplicity compared to some modern turbocharged counterparts.
Owners of the EX35 often appreciate its driving dynamics. The vehicle features a sport-tuned suspension and a responsive steering rack that make it feel more like a hatchback than a traditional SUV. The interior is typically well-appointed, offering premium materials, comfortable seating, and advanced features for its time, including navigation and backup cameras on higher trims. It serves as a practical daily driver for those who need a bit more cargo space than a sedan provides but do not want to sacrifice the driving enjoyment they crave. The platform shares its underlying architecture with the Infiniti G35 coupe and sedan, contributing to its reputation as a “driver’s choice” in the luxury segment.
Maintaining this vehicle requires an understanding that it is a performance-oriented machine. While it is robust, its longevity depends heavily on strict adherence to maintenance schedules and the use of high-quality lubricants. The VQ35HR engine can be prone to timing chain tensioner issues if the oil used does not provide adequate film strength, making the choice of synthetic oil particularly critical for these older models. By using the recommended AMSOIL products, owners can mitigate these risks, ensuring their EX35 continues to perform smoothly for many years to come. The combination of the agile chassis and the reliable V6 engine makes the EX35 a rewarding vehicle for enthusiasts who value both style and substance.