Ensuring your 2021 Jeep Grand Cherokee with the 5.7L Hemi V8 runs at peak performance requires more than just filling it with any standard fluid. The power and durability of this iconic SUV depend on using the correct viscosity and specifications for every system, from the engine block to the transfer case. AMSOIL synthetic lubricants are engineered to meet or exceed the demands of this vehicle, offering superior protection against wear, thermal breakdown, and contamination. By selecting the right lubricants, you extend the life of critical components and maintain the drivability that owners expect from a Jeep.
Recommended AMSOIL Products
The following AMSOIL products are specifically recommended for the 2021 Jeep Grand Cherokee 5.7L (Engine Code EZH). These fluids are formulated to handle the extreme temperatures, heavy loads, and long service intervals associated with this powerful engine and its complex drivetrain.
- AMSOIL Signature Series 5W-20 100% Synthetic Motor Oil – Offers the highest level of protection with extended change intervals, capable of lasting up to 25,000 miles under normal driving conditions or 100% of the time between changes. It provides 75% more engine protection against horsepower loss and wear.
- AMSOIL Extended-Life 5W-20 100% Synthetic Motor Oil – A great option for drivers who want high-level protection with a slightly shorter interval, guaranteeing up to 20,000 miles of protection. It features 37% more cleaning power to keep the engine running smoother.
- AMSOIL OE 5W-20 100% Synthetic Motor Oil – Designed to outperform conventional oils and meet OEM requirements, this oil fights sludge and deposits effectively. It is trusted by professional engine builders and offers excellent protection for turbochargers.
- AMSOIL 5W-20 100% Synthetic High-Mileage Motor Oil – Specifically formulated for vehicles with over 75,000 miles, featuring unique chemistry to reduce sludge by 67% and help engines last longer. It contains enhanced anti-wear additives to boost performance.
- AMSOIL Oil Filter – Provides 99% filtering efficiency at 20 microns and offers extended service life to match synthetic oil. It allows lower restriction for better lubrication and holds a greater capacity for small, wear-causing contaminants.
- WIX Oil Filter – Offers premium media improvements over original equipment manufacturer (OEM)-branded filters for cost-effective protection.
- WIX Air Filter – Features premium media that offers improvements over original equipment manufacturer (OEM)-branded filters for better airflow.
- AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Withstands the rigors of heavy towing, elevated temperatures, and challenging terrain. It remains fluid in sub-zero temperatures and provides reserve protection during heavy use.
- AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Provides protection against wear and is an excellent choice for meeting OEM requirements.
- AMSOIL Signature Series Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – A versatile fluid option that withstands heavy towing and elevated temperatures.
- AMSOIL OE Multi-Vehicle 100% Synthetic Automatic Transmission Fluid – Resists harmful sludge and promotes smooth, shudder-free shifts.
- AMSOIL SEVERE GEAR® 75W-85 100% Synthetic Gear Lube – Essential for front and rear differentials, this lube controls thermal runaway, protects against rust and corrosion, and helps reduce operating temperatures. It contains friction modifiers ideal for limited-slip applications.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Provides excellent ABS and traction-control responsiveness with stable viscosity over a wide temperature range, ensuring consistent braking performance in extreme conditions.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A pre-mix formulation that protects cooling system metals and hoses, offering up to 150,000 miles of protection.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated option that surpasses standards for metallic corrosion and erosion, offering up to 150,000 miles or 5 years of protection.
The engine of your 2021 Grand Cherokee is a robust 5.7L V8, which demands precise lubrication to maintain its power output and efficiency. The recommended oil grade is 5W-20, with a capacity of 7.0 quarts including the filter. Whether you choose the Signature Series for maximum durability or the OE line for value, using a 5W-20 viscosity is critical for the Hemi engine’s hydraulic lifters and variable valve timing systems. This fluid ensures quick circulation during cold starts while maintaining the necessary film strength at operating temperatures.
For cooling, the Grand Cherokee’s 8-speed automatic transmission (8HP70) requires specific fluid to manage the heat generated during shifting and towing. AMSOIL synthetic transmission fluids are designed to reduce friction and protect against wear in these complex hydraulic systems. Additionally, the front and rear differentials and the transfer case require 75W-85 synthetic gear lube to handle the torque and stress of off-road driving. Using the correct fluid for the differential and transfer case prevents thermal runaway, a common issue when standard gear lubes break down under heavy load.
Maintenance intervals can be extended significantly when using synthetic fluids compared to conventional ones, but it is still essential to replace filters at the recommended times. The AMSOIL Oil Filter is engineered to capture microscopic particles that can cause engine wear over time. By combining these high-performance fluids with quality filtration, you ensure that your vehicle operates smoothly whether you are commuting in the city or tackling a trail.
About the Vehicle
The 2021 Jeep Grand Cherokee represents the height of the fourth-generationWK2 platform, which has been a staple in the mid-size luxury SUV market since its introduction. This particular model is highly regarded for its blend of rugged off-road capability and on-road comfort, making it a versatile choice for families and adventure seekers alike. The 5.7L Hemi V8, specifically the engine code EZH, is a powerhouse that delivers substantial horsepower and torque, allowing for confident merging and towing capabilities that rival larger trucks.
Owners appreciate the Grand Cherokee for its sophisticated interior, advanced safety features, and the renowned Quadra-Lift air suspension available on many trims, which provides a smooth ride over uneven terrain. The vehicle’s reputation is built on its ability to handle diverse driving conditions, from harsh winter roads to summer desert heat. The 8-speed automatic transmission is a key component of this capability, offering seamless gear changes that keep the powerful engine in its optimal power band.
Despite its durability, the 2021 Grand Cherokee can benefit from specific preventive measures regarding its lubrication systems. One common issue among Hemi owners is the development of oil consumption in high-mileage engines due to piston ring carbon buildup. Using a high-mileage synthetic oil with enhanced detergents can help mitigate this issue and maintain oil levels over long periods.
Another area of concern for long-term owners is the transfer case fluid breakdown, particularly in models used for serious off-roading or towing. Standard gear lubes can sometimes degrade under extreme shear stress, leading to whining noises or shifting issues. Switching to a 100% synthetic 75W-85 gear lube like the AMSOIL SEVERE GEAR® provides superior shear stability and thermal resistance, addressing this common maintenance challenge.
Furthermore, the cooling system in the Grand Cherokee can face stress from the heat generated by the large V8 engine and the transmission. AMSOIL Antifreeze & Coolant formulation allows for use in a wide variety of vehicles, offering extended protection up to 150,000 miles, helping to prevent corrosion in the aluminum radiators and cooling passages typical of this vehicle.
Finally, AMSOIL Brake Fluid is another critical maintenance item. Moisture absorption in the brake system can lead to a spongy pedal feel and reduced braking efficiency. AMSOIL synthetic brake fluid resists moisture absorption and maintains its boiling point, ensuring that the powerful braking system of the Grand Cherokee remains responsive and safe, regardless of how often you use the brakes for towing or spirited driving.
Regular maintenance with these specialized fluids not only extends the life of the 2021 Jeep Grand Cherokee but also preserves its resale value. By understanding the specific needs of the 5.7L Hemi and its associated systems, owners can make informed decisions that protect their investment and keep their vehicle performing at its best for years to come.