Keeping your 2018 Infiniti Q70 with the 5.6L 8-cylinder engine running smoothly requires the right lubricants. The massive 5.6-liter VK56VD engine produces significant power and torque, placing high demands on its internal components. Using a high-quality synthetic lubricant ensures that all moving parts remain properly coated, reducing friction and wear even under severe driving conditions like towing or frequent stop-and-go traffic. Below, we outline the specific AMSOIL products that meet the rigorous requirements of this luxury sedan.
Recommended AMSOIL Products
- AMSOIL Signature Series 5W-30 100% Synthetic Motor Oil – Provides up to 25,000 miles of protection, offering the highest level of defense against horsepower loss and wear for your VK56VD engine.
- AMSOIL Extended-Life 5W-30 100% Synthetic Motor Oil – Delivers extended protection for up to 20,000 miles with superior cleaning power to keep the engine running smoother for longer.
- AMSOIL Oil Filter (EA15K13-EA) – Designed to filter out small, wear-causing contaminants with 99% efficiency, helping to reduce engine wear and extend service life.
- WIX Oil Filter (57356-EA) – Premium media offers improvements over original equipment manufacturer (OEM)-branded filters.
- WIX Air Filter (46044-EA) – Premium media offers improvements over original equipment manufacturer (OEM)-branded filters.
- AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Specifically formulated to withstand the rigors of heavy towing and elevated temperatures found in the Q70’s RE7R01A transmission.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – An ethylene glycol 50/50 pre-mix that protects all cooling system metals and hoses for up to 150,000 miles.
Selecting the Right Motor Oil
The heart of the 2018 Infiniti Q70 is its VK56VD 5.6-liter V-8 engine. This powerplant is known for its smooth power delivery and robust performance, but it relies heavily on the quality of the oil circulating through it. The manufacturer specifies a 5W-30 viscosity grade for this engine to ensure proper lubrication across a wide range of temperatures. However, factory fill oils and standard conventional fluids often break down under the thermal stress generated by a large-displacement engine, especially during aggressive driving or long highway cruises.
AMSOIL Signature Series 5W-30 100% Synthetic Motor Oil is engineered to outperform industry standards. With up to 25,000 miles of protection between changes, it significantly reduces the frequency of oil changes while simultaneously providing superior protection against wear. The formulation is rich in additives that prevent sludge buildup and maintain viscosity control, ensuring that the engine stays clean and lubricated regardless of driving style. For owners who prefer a longer interval but slightly less premium protection than the Signature Series, the AMSOIL Extended-Life 5W-30 100% Synthetic Motor Oil offers a solid alternative, guaranteeing 20,000 miles of performance with enhanced cleaning capabilities.
The oil capacity for the 5.6L engine is 6.4 quarts when performing a complete change including the oil filter. It is crucial to adhere to the correct torque specifications for the drain plug, which is 25 ft-lbs, and to always install a new washer on the drain bolt. After refilling, the oil level should be checked to ensure it falls within the optimal operating range. Pairing this oil with the AMSOIL Oil Filter (EA15K13-EA) ensures that contaminants are removed efficiently, maintaining a steady flow of clean oil to critical engine components.
Transmission and Cooling Systems
The automatic transmission in the 2018 Q70 utilizes the RE7R01A gearbox, which requires a fluid compatible with its specific friction modifiers and thermal properties. AMSOIL Signature Series Multi-Vehicle 100% Synthetic Automatic Transmission Fluid is recommended for this application. This fluid remains fluid in sub-zero temperatures and is designed to withstand the high temperatures generated during heavy use, towing, or challenging terrain. A full fluid capacity for the automatic transmission is 10.6 quarts, making it essential to have the correct amount of high-quality fluid on hand for a proper flush or fill.
The cooling system of the Q70 is equally vital. With a capacity of 11.5 quarts, the radiator and cooling system require a fluid that offers robust corrosion protection and thermal stability. AMSOIL Passenger Car & Light Truck Antifreeze & Coolant is an ethylene glycol 50/50 pre-mix designed to exceed original equipment manufacturer requirements. It provides protection up to 150,000 miles or 5 years, ensuring that the engine operates within safe temperature limits. For those who prefer a concentrated formula that allows for custom mixing ratios, the AMSOIL Propylene Glycol Antifreeze and Engine Coolant offers protection up to 150,000 miles in passenger cars and even longer service intervals in heavy-duty applications.
Final Drive and Differential Lubrication
While the Q70 is a front-engine, rear-wheel-drive vehicle, proper lubrication of the differential and transfer case is critical for longevity and smooth power transfer. The front differential requires a GL-5 AMSOIL SEVERE GEAR 80W-90 100% Synthetic Gear Lube for this application. It contains friction modifiers suitable for limited-slip differentials and helps control thermal runaway, protecting the gears from wear and rust.
The rear differential requires a 75W-90 synthetic AMSOIL SEVERE GEAR 75W-90 100% Synthetic Gear Lube. This synthetic gear lube is designed to provide advanced protection against wear, rust, and corrosion. It helps reduce operating temperatures and extends the life of the oil, seals, and equipment. The rear differential capacity is approximately 2.3 pints. For the transfer case, where applicable, the specific capacity may vary, but synthetic lubricants like the AMSOIL SEVERE GEAR 80W-90 100% Synthetic Gear Lube can be used where specified, ensuring reliable performance in all driving conditions. Alternatively, the AMSOIL 75W-90 Long Life 100% Synthetic Gear Lube is available for applications requiring extended service life.
Essential Fluids for Brakes and Steering
Brake performance is a non-negotiable safety feature, particularly in a vehicle with the acceleration and weight of the Infiniti Q70. The hydraulic AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid in this system should be replaced periodically to prevent moisture absorption, which can lead to a spongy pedal feel and reduced braking efficiency. It is formulated to provide excellent ABS and traction-control responsiveness. It maintains stable viscosity over a wide temperature range, ensuring consistent braking power in both cold starts and heavy braking situations.
The power steering system also benefits from synthetic lubrication. The Q70 requires a fluid that reduces friction and helps keep seals soft to prevent leaks. AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid is designed for quiet operation and offers strong anti-wear protection. It resists heat for long fluid life and provides excellent high-temperature and low-temperature performance, ensuring smooth steering response regardless of the weather.
About the Vehicle
The 2018 Infiniti Q70 represents the pinnacle of Infiniti’s luxury sedan lineup during that model year, combining Japanese craftsmanship with a commitment to performance. As a front-engine, rear-wheel-drive vehicle, the Q70 offers a traditional driving dynamics that many enthusiasts find more engaging than the all-wheel-drive setups common in some competitors. The platform is built on a robust chassis designed to handle the significant weight of the full-size sedan while maintaining a balance between comfort and sportiness. The Q70 is often praised for its quiet cabin and plush interior, providing a serene environment for both the driver and passengers.
The 5.6-liter V-8 engine, known as the VK56VD, is a masterpiece of natural aspiration. It produces substantial horsepower and torque without the reliance on forced induction, delivering power in a linear and predictable fashion. This engine is designed for durability and smooth operation, making it a popular choice for those who want a responsive driving experience without the complexity of turbochargers or superchargers. The V-8 is paired with a smooth-shifting automatic transmission that contributes to the car’s luxury feel.
Owners of the 2018 Q70 often appreciate the vehicle’s blend of classic luxury sedan traits with modern safety and technology features. It serves as a comfortable cruiser for long-distance travel while still being capable enough for spirited driving on back roads. The vehicle’s market position is strong as a premium alternative to other luxury German sedans, offering comparable quality with a unique Japanese aesthetic and engineering approach.
Despite its reliability, the Q70 can face issues common to high-performance luxury vehicles with large V-8 engines. One common problem is the accumulation of carbon deposits on the intake valves, a frequent issue with direct injection engines. Regular use of fuel additives can help mitigate this buildup. Another potential concern is transmission fluid degradation, as the fluid can break down over time, leading to shudder or harsh shifts. Using a high-quality synthetic transmission fluid can extend the life of the fluid and the transmission components. Additionally, large engines can sometimes experience oil sludge buildup if conventional oils are used or oil changes are neglected, which can lead to reduced engine life. The use of high-performance synthetic motor oils can prevent this sludge formation. Finally, the cooling system can develop leaks or corrosion over time, especially in older vehicles, making the use of a high-quality antifreeze and AMSOIL Passenger Car & Light Truck Antifreeze & Coolant essential to maintain optimal operating temperatures and protect the cooling system components.