The 2018 Jeep Grand Cherokee equipped with the 5.7L HEMI V-8 is a powerhouse known for its blend of rugged off-road capability and refined on-road driving dynamics. To maintain the performance of this iconic engine, using the correct synthetic lubricants is essential for maximizing fuel economy, minimizing wear, and ensuring reliable operation under both light and severe driving conditions. This guide details the recommended AMSOIL products and fluids specifically selected for the 5.7L V-8 engine (Engine Code [T] EZH T) and compatible drivetrain components.
Recommended AMSOIL Products
- AMSOIL Signature Series 5W-20 100% Synthetic Motor Oil – The premier choice for maximum engine protection, offering up to 25,000 miles of service and superior resistance to horsepower loss and wear.
- AMSOIL Extended-Life 5W-20 100% Synthetic Motor Oil – A robust option providing 37% more cleaning power and up to 20,000 miles of guaranteed protection between changes.
- AMSOIL OE 5W-20 100% Synthetic Motor Oil – Designed to outperform conventional oils with a formulation that fights sludge and deposits effectively.
- AMSOIL 5W-20 100% Synthetic High-Mileage Motor Oil – Specifically engineered for engines with over 75,000 miles to reduce sludge, boost detergents, and restore engine performance.
- AMSOIL Oil Filter – Features 99% filtration efficiency at 20 microns and provides greater capacity for contaminants to extend engine life.
- WIX Oil Filter – A premium aftermarket alternative offering improved filtration performance over standard OEM-branded filters.
- WIX Air Filter – A premium aftermarket alternative offering improved filtration performance over standard OEM-branded filters.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – An OAT formulation offering up to 150,000 miles or 5 years of protection for all cooling system metals.
- 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 – Protects against wear and promotes smooth, shudder-free shifts.
- AMSOIL SEVERE GEAR® 75W-85 100% Synthetic Gear Lube – Provides advanced protection against wear and thermal runaway for front and rear differentials.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Delivers excellent ABS and traction-control responsiveness with stable viscosity across a wide temperature range.
Optimizing Engine Performance with Synthetic Oil
The 5.7L HEMI V-8 in your Grand Cherokee is a sophisticated engine designed to deliver significant horsepower and torque. However, the stress placed on internal components during acceleration, towing, or spirited driving can lead to heat buildup and oil breakdown if conventional fluids are used. By selecting a synthetic motor oil, you ensure that the lubricant maintains its viscosity and protective properties even under extreme temperatures. The 5W-20 viscosity grade is the correct specification for this engine, providing optimal flow during cold starts and stable lubrication at operating temperature.
AMSOIL Signature Series 5W-20 100% Synthetic Motor Oil is the top recommendation for those seeking the absolute best protection. It is formulated to reduce horsepower loss and wear by up to 75% compared to conventional oils, ensuring your Grand Cherokee performs as intended for extended periods. This oil is capable of lasting up to 25,000 miles or one year under normal service conditions, significantly reducing the frequency of oil changes. For owners who prefer a slightly shorter but still extended interval, the Extended-Life 5W-20 offers up to 20,000 miles of protection while providing enhanced cleaning power to remove deposits before they harden.
For vehicles that have accumulated over 75,000 miles, the 5W-20 100% Synthetic High-Mileage Motor Oil is the ideal solution. This formula includes a unique chemistry designed to address the specific needs of older engines, such as reduced sludge by 67% and enhanced anti-wear additives. It helps to improve oil control in engines that may have developed slight leaks or are consuming more oil than newer counterparts, helping to keep the engine running smoother and performing better as it ages.
Protecting the Drivetrain and Cooling System
Beyond the engine, the longevity of your 2018 Jeep Grand Cherokee depends heavily on the condition of its automatic transmission, transfer case, and differentials. The 8HP70 automatic transmission in this model is a robust unit, but it requires high-quality fluid to withstand the rigors of heavy towing, challenging terrain, and high operating temperatures. AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid is specifically engineered to remain fluid in sub-zero temperatures while providing reserve protection during heavy use. It helps to reduce friction, which can lead to improved fuel economy and smoother gear shifts.
For transfer cases and differentials, AMSOIL SEVERE GEAR® 75W-85 100% Synthetic Gear Lube is the recommended product. This synthetic gear lube is designed to control thermal runaway, a common issue in high-stress applications where gears can overheat and fail. It also contains friction modifiers beneficial for limited-slip differentials, ensuring that the vehicle handles well even when one wheel loses traction. The fluid also protects against rust and corrosion, helping to extend the life of the seals and other components within the drivetrain.
The cooling system is another critical area that requires attention. The 5.7L engine generates substantial heat, and maintaining the correct AMSOIL Passenger Car & Light Truck Antifreeze & Coolant mixture is vital to prevent overheating. This product offers a unique poly-organic acid formulation that protects all cooling system metals, gaskets, and hoses. It is designed to last up to 150,000 miles or five years, whichever comes first, ensuring that your engine stays cool and operates efficiently throughout the year. For those who prefer a concentrated coolant, the AMSOIL Propylene Glycol Antifreeze and Engine Coolant is an excellent choice, offering protection up to 150,000 miles in passenger cars and light trucks.
Brake Fluid and Fuel System Maintenance
Safety is paramount, and the braking system plays a crucial role in the performance of the Grand Cherokee. AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid is recommended to replace standard brake fluids. This synthetic fluid provides a stable viscosity over a wide temperature range, ensuring excellent responsiveness from the ABS and traction control systems. It eliminates the moisture absorption issues associated with conventional brake fluids, which can lead to brake fade and corrosion within the system.
Maintaining fuel system cleanliness is also important for maximizing fuel economy and preventing engine deposits. While the AMSOIL P.i. Performance Improver is a top-tier gasoline additive for cleaning injectors and restoring horsepower, the proper selection of oils and fluids for the Grand Cherokee creates a solid foundation for overall vehicle health. Regular maintenance with these high-quality fluids helps to ensure that the engine runs cleaner and more efficiently, contributing to the vehicle’s reputation for reliability and performance.
About the Vehicle
The 2018 Jeep Grand Cherokee is a quintessential mid-size luxury SUV that strikes a balance between off-road capability and on-road refinement. Built on the JK platform, which has been a staple in Jeep’s lineup for several years, this vehicle is renowned for its versatility. Owners appreciate the Grand Cherokee for its ability to handle rugged trails with ease while offering a comfortable and quiet ride on the highway. The 5.7L HEMI V-8 engine, available in various trim levels including the Limited and Overland, provides substantial power output, making it a favorite for those who tow heavy loads or require quick acceleration for passing on winding roads.
One of the defining characteristics of the 2018 Grand Cherokee is its advanced four-wheel-drive systems, often paired with the Quadra-Lift air suspension in higher trims. This suspension system allows the vehicle to adjust its ride height for various driving conditions, from low clearance at highway speeds to high clearance for off-road obstacles. The interior is designed with a focus on luxury, featuring premium materials, a spacious cabin, and advanced technology features that keep occupants connected and entertained. The vehicle’s market position as a premium SUV is reinforced by its strong resale value and the dedicated community of Jeep enthusiasts who value its heritage and capability.
While the Grand Cherokee is a reliable vehicle, there are common issues that owners may encounter, particularly with the 5.7L HEMI engine. One prevalent problem is the occurrence of oil sludge buildup, which can clog oil galleries and lead to increased engine wear. Using high-quality synthetic motor oil with superior cleaning properties is an effective way to mitigate this issue, keeping critical engine passages clear and preventing the formation of harmful deposits. Another common concern involves the oil cooler, which can sometimes develop leaks, leading to oil mixing with coolant. Proper fluid selection and regular inspections can help identify potential failures early.
A third potential issue involves the transmission shifting quality, where jerky or delayed shifts can occur due to degraded fluid or varnish buildup. This can be exacerbated by severe driving conditions such as towing or driving in extreme heat. Regular fluid changes with a synthetic automatic transmission fluid designed to resist oxidation and maintain viscosity can restore smooth shifting and extend transmission life. Finally, the 5.7L engine has been known to experience spark plug fouling, which can lead to misfires and reduced fuel economy. This is often attributed to carbon buildup on the plugs, a problem that can be alleviated by using high-performance motor oils and fuel additives that help keep the combustion chambers clean, ensuring optimal engine performance and longevity.
Ultimately, the 2018 Jeep Grand Cherokee 5.7L is a capable and powerful vehicle that rewards diligent maintenance. By choosing the right AMSOIL lubricants and adhering to recommended service intervals, owners can enjoy the full potential of this legendary SUV for years to come. Whether navigating city streets or tackling mountain trails, the Grand Cherokee remains a top choice for those who demand performance, comfort, and reliability.