Maintaining the health of your 2008 Infiniti G37’s 3.7-liter VQ37VHR engine requires more than just a routine top-off. This high-revving powerplant benefits significantly from the precision protection offered by full-synthetic lubricants, which provide superior stability against the high temperatures and stress generated during spirited driving. Proper fluid selection extends component life, ensures smoother operation, and helps preserve the vehicle’s dynamic performance characteristics. Below are the specific AMSOIL products and fluid recommendations tailored for this model.
Recommended AMSOIL Products
- AMSOIL Signature Series 5W-30 100% Synthetic Motor Oil – Delivers unsurpassed engine protection for up to 25,000 miles with superior horsepower retention and wear resistance.
- AMSOIL Extended-Life 5W-30 100% Synthetic Motor Oil – Offers 37% more cleaning power and protects against low-speed pre-ignition for up to 20,000 miles.
- AMSOIL OE 5W-30 100% Synthetic Motor Oil – A cost-effective full synthetic option that fights sludge and deposits while meeting OEM milestones.
- AMSOIL 5W-30 100% Synthetic High-Mileage Motor Oil – Formulated specifically for engines over 75,000 miles with boosted detergents to reduce sludge.
- AMSOIL Oil Filter – Features 99% efficiency at 20 microns and greater contaminant capacity to reduce engine wear.
- WIX Oil Filter – Provides premium media improvements over standard OEM-branded filters for reliable filtration.
- WIX Air Filter – Offers premium media improvements over original equipment manufacturer filters for the air intake system.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A long-life, phosphate-free formulation protecting cooling system metals for up to 150,000 miles.
- AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Withstands heavy towing and elevated temperatures while remaining fluid in sub-zero conditions.
- AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – A fuel-efficient option that protects against wear in automatic transmissions.
- AMSOIL 75W-90 Manual Transmission & Transaxle Gear Lube – Designed for manual gearboxes, offering protection for brass synchronizers and excellent cold-flow properties.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Ensures excellent ABS and traction-control responsiveness with stable viscosity across temperature ranges.
- AMSOIL SEVERE GEAR 80W-90 100% Synthetic Gear Lube – Contains friction modifiers for limited-slip differentials and controls thermal runaway.
- AMSOIL SEVERE GEAR 75W-90 100% Synthetic Gear Lube – Advanced protection against wear for both front and rear differential applications.
- AMSOIL SEVERE GEAR 75W-110 100% Synthetic Gear Lube – A heavier viscosity option for limited-slip applications requiring maximum film strength.
- AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid – Keeps seals soft to prevent leaks and offers strong anti-wear protection for quiet operation.
Engine Oil and Filtration Specifications
The heart of the 2008 Infiniti G37 is the VQ37VHR engine, a 3.7-liter V6 that produces significant horsepower. To keep this engine running smoothly, the correct viscosity grade is essential. For all temperature ranges, SAE 5W-30 is the preferred viscosity. The engine oil capacity is 5.2 quarts when including a filter replacement. When adding oil, it is crucial to check the level after refilling to ensure the oil is not overfilled, as this can lead to foaming and reduced lubrication efficiency. Additionally, the oil drain plug should be torqued to a specific 25 ft/lbs to prevent leaks or thread damage without risking over-tightening.
AMSOIL offers a tiered approach to motor oil selection based on your driving habits and vehicle age. For those seeking maximum protection and extending service intervals, the Signature Series 5W-30 is engineered to provide up to 25,000 miles of protection. This oil is rigorously tested and offers 75% more engine protection against horsepower loss and wear compared to other oils. It is an ideal choice for drivers who subject their G37 to high-performance driving or who simply prefer the peace of mind that comes with extended change intervals.
For drivers who want a balance between performance and value, the Extended-Life 5W-30 provides up to 20,000 miles of guaranteed protection. This formula features enhanced cleaning power to keep the engine running smoother for longer and helps protect against Low-Speed Pre-Ignition (LSPI), a condition that can damage engines under high load.
If your G37 has accumulated significant mileage, specifically over 75,000 miles, the High-Mileage Motor Oil is the recommended choice. Its unique chemistry includes a boosted detergent package to clean up sludge and deposits that may have accumulated over time, along with seal conditioners to help prevent leaks. This oil is API licensed and offers guaranteed protection for 12,000 miles or one year, making it perfect for maintaining older, high-mileage vehicles.
Regardless of the oil choice, the filtration system is just as critical as the oil itself. The AMSOIL Oil Filter is designed to provide superior filtration with 99% efficiency at 20 microns. It allows for lower oil restriction, ensuring parts remain lubricated, and holds greater capacity for small, wear-causing contaminants than competing filters. Alternatively, the WIX Oil Filter offers premium media that improves upon original equipment manufacturer filters, ensuring reliable protection alongside any of the AMSOIL oil choices.
Transmission and Drivetrain Fluids
The drivetrain of the Infiniti G37 plays a vital role in delivering the vehicle’s power to the road. For automatic transmissions, specifically the RE5R05A (5-speed), the total fill capacity is 10.9 quarts. To maintain optimal performance, using a fluid designed for these high-performance automatics is key. The Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid is built to withstand the rigors of heavy towing, elevated temperatures, and challenging terrain. It remains fluid even in sub-zero temperatures, providing reserve protection during heavy use and abuse.
For those looking for a slightly more economical option without sacrificing protection, the OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid is an excellent choice. It provides robust protection against wear, helping to extend the life of the transmission components.
If your G37 is equipped with a manual transmission, specifically the FS6R31A (6-speed), you will need a fluid designed for manual gearboxes. The capacity for a manual transmission is 5.9 pints. The 75W-90 Manual Transmission & Transaxle Gear Lube is formulated with friction modifiers to protect brass synchronizers and offers excellent cold-flow properties. It inhibits rust and corrosion while maintaining excellent seal compatibility.
The differential also requires regular attention. For the front differential, the capacity is 1.4 pints, and for the rear differential, it is 3 pints. Both differentials typically require GL-5 fluid. The SEVERE GEAR 80W-90 100% Synthetic Gear Lube is ideal for limited-slip applications and controls thermal runaway to help reduce operating temperatures. The SEVERE GEAR 75W-90 100% Synthetic Gear Lube is another excellent option that provides advanced protection against wear for any temperature range. For those requiring maximum film strength in limited-slip differentials, the SEVERE GEAR 75W-110 100% Synthetic Gear Lube offers a heavier viscosity to handle extreme loads.
Coolant, Brake Fluid, and Power Steering
Proper cooling system maintenance is essential for the longevity of the VQ37VHR engine. The cooling system capacity for the 2008 Infiniti G37 is 9.5 quarts. The AMSOIL Passenger Car & Light Truck Antifreeze & Coolant is a unique poly-organic acid (OAT) formulation that allows for use in a wide variety of vehicles. It is engineered to exceed OEM requirements and protects all cooling system metals, gaskets, and hoses. This ethylene glycol 50/50 pre-mix formulation protects against corrosion for up to 150,000 miles or five years. For those who prefer a concentrated formula, the Propylene Glycol Antifreeze and Engine Coolant is a concentrated option that requires mixing with distilled or high-quality water, offering extended protection for up to 150,000 miles.
Braking performance is critical for a vehicle of this caliber. The G37 uses DOT 3 hydraulic brake fluid. The AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid ensures excellent ABS and traction-control responsiveness. It maintains a stable viscosity over a wide temperature range, ensuring consistent pedal feel whether you are driving in cold mornings or under hard braking conditions.
For the power steering system, which requires fluid that resists heat and friction, the 100% Synthetic Multi-Vehicle Power Steering Fluid is the recommended choice. It helps seals remain soft to prevent leaks and resists heat for long fluid life. The fluid is formulated for quiet operation, reducing friction and providing strong anti-wear protection.
Maintenance Intervals and Additional Protection
Adhering to a strict maintenance schedule with high-quality fluids is the best way to ensure your 2008 Infiniti G37 remains reliable and performs at its peak. AMSOIL’s synthetic lubricants are designed to outperform conventional oils, offering extended drain intervals that reduce the frequency of oil changes while increasing engine protection. Whether you are driving on long commutes, navigating through stop-and-go traffic, or enjoying a spirited drive on the open road, using the recommended fluids will help your vehicle withstand the added stress of modern driving conditions.
Beyond the core lubricants, there are additional products that can enhance the performance and longevity of your G37. For seasonal storage, the AMSOIL Gasoline Stabilizer helps keep fuel fresh for up to 12 months, protecting against varnish and gum buildup. During long periods of inactivity, the AMSOIL Engine Fogging Oil provides a highly effective rust preventive to protect internal engine components. To maintain peak performance, the AMSOIL P.i. Performance Improver can be added to your fuel tank to restore up to 14% horsepower and improve fuel economy.
Regular care extends to the exterior and interior as well. The High-Foam Car Shampoo provides a professional-strength wash that is gentle on coatings, while the Exterior Ceramic Spray offers rapid water shedding and UV protection. For interior cleaning, the Interior Detailer – Light Lemon or the Scent Free version effectively cleans and protects surfaces with 90-day UV protection. These products ensure that your G37 not only performs well but also looks its best.
Why Owners Love the Infiniti G37
The 2008 Infiniti G37 occupies a unique space in the luxury sports sedan market. Launched as a replacement for the Infiniti G35, the G37 brought a refined blend of performance, comfort, and style that appealed to a wide range of drivers. Powered by the iconic VQ series engines, the 3.7-liter V6 known as the VQ37VHR was a significant evolution, offering increased power and efficiency over its predecessor. This engine is celebrated for its high-revving nature and smooth power delivery, making the G37 a favorite among enthusiasts who appreciate a engaging driving experience.
The G37 is often praised for its balanced handling and responsive steering, traits that are hallmarks of the Infiniti brand. Whether in sedan, coupe, or convertible form, the vehicle offers a driver-focused cockpit that encourages spirited driving without sacrificing daily usability. The interior quality of the 2008 model is robust, featuring high-quality materials and ergonomic controls that stand the test of time. This combination of performance credentials and everyday practicality has cemented the G37’s reputation as one of the most beloved sports sedans of its era.
Owners of the G37 often find that with proper maintenance, particularly using high-quality synthetic lubricants, the vehicle can deliver years of reliable and enjoyable service. The VQ37VHR engine is known for its durability, provided it receives the correct oil and filtration. By maintaining the engine, transmission, and other vital systems with the recommended fluids, owners can keep their G37 running smoothly, preserving its dynamic character and value for the long haul. Whether used for weekend autocross events or daily commutes, the G37 remains a rewarding vehicle to own and drive.