The 6.2-liter HEMI V8 engine is a robust powerplant capable of delivering substantial torque and horsepower. However, this power comes with high operating temperatures and significant internal stress. Synthetic oil is not just an upgrade; it is a requirement for this specific engine code. The manufacturer specifies the use of synthetic oil to ensure the longevity of the engine components, particularly under heavy load or extreme temperature conditions.
For the 6.2L engine, the oil capacity is 8.2 quarts when the filter is replaced. This volume is critical to maintain proper oil levels and ensure the pump can circulate fluid effectively throughout the block. AMSOIL Signature Series 0W-40 100% Synthetic Motor Oil is engineered to provide 75% more engine protection against horsepower loss and wear compared to industry standards. Its high-quality base stock and additive package ensure that the oil remains stable under the intense heat generated by the V8, preventing oil breakdown and sludge formation.
The OE 0W-40 100% Synthetic Motor Oil is another excellent choice for owners seeking a cost-effective yet high-performance solution. This oil fights sludge and deposits while providing 100% synthetic protection that exceeds many original equipment requirements. For those with a preference for European-formulated additives or specific viscosity characteristics, the 0W-40 FS 100% Synthetic European Motor Oil offers a precise blend designed to meet the demands of modern high-output engines.
Filtration is equally important. An oil filter traps abrasive particles that can cause scoring on cylinder walls and bearing surfaces. The AMSOIL Oil Filter features a synthetic media blend that allows for lower restriction compared to standard filters, ensuring maximum oil flow to critical engine parts. It also holds more dirt capacity, extending the service life of the filter and the oil. For drivers who prefer WIX products, the WIX Oil Filter provides premium media that offers improvements over standard OEM filters, ensuring clean oil circulates through the engine.
Transmission and Drivetrain Lubrication
The transmission in the 2018 Jeep Grand Cherokee 6.2L is subjected to high torque loads, especially when towing or off-roading. Using a dedicated synthetic transmission fluid is essential to maintain shift quality and prevent heat-related degradation. For the automatic transmission, specifically the 8HP95 model, AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid offers a robust defense against wear. It remains fluid in sub-zero temperatures while resisting thinning at high operating temperatures, ensuring the transmission stays protected during heavy towing and challenging terrain.
If you prefer a more budget-friendly option that still delivers synthetic performance, the OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid is a top-tier choice. It resists harmful sludge and promotes smooth, shudder-free shifts. For the transfer case, which is critical for all-wheel-drive systems, the Signature Series Multi-Vehicle 100% Synthetic Automatic Transmission Fluid or the OE Multi-Vehicle variant is recommended. These fluids are formulated to handle the unique demands of transfer cases, protecting against leaks and ensuring reliable power delivery to all wheels.
The differentials on the Grand Cherokee require specialized lubrication to handle the stress of 4×4 driving. Both the front and rear differential axles require synthetic gear lube with GL-5 specifications. The 195FIA front differential calls for 1.9 pints of 75W-85 gear lube, while the 230RIA rear differential with ELSD requires 2.7 pints of the same viscosity. AMSOIL SEVERE GEAR® 75W-85 100% Synthetic Gear Lube is an ideal fit. It contains friction modifiers specifically designed for limited-slip applications, controls thermal runaway, and provides long oil, seal, and equipment life.
Cooling and Brake Systems
Proper cooling is vital for the longevity of the 6.2L HEMI, which generates significant heat. The engine cooling system requires a capacity of 14.7 quarts, while the intercooler requires 4.1 quarts. AMSOIL Passenger Car & Light Truck Antifreeze & Coolant is a ready-to-use, 50/50 pre-mix formulation that protects all cooling system metals, gaskets, and hoses. It is phosphate, nitrate, nitrite, silicate, borate, and amine-free, making it safe for use in modern cooling systems without causing compatibility issues. For those who prefer to mix their own, the Propylene Glycol Antifreeze and Engine Coolant offers a concentrated solution that can be mixed with distilled water to achieve maximum protection.
Brake performance is non-negotiable for a heavy vehicle like the Grand Cherokee. Brake fluid absorbs moisture over time, which can lead to a spongy pedal and reduced braking efficiency. AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid is designed to maintain a stable viscosity over a wide temperature range. This stability ensures excellent ABS and traction-control responsiveness, even after repeated hard stops. By preventing fluid boil and corrosion, this synthetic brake fluid extends the life of the braking system and improves safety.
About the Vehicle
The 2018 Jeep Grand Cherokee represents the pinnacle of the WK2 generation, blending luxury with rugged capability. Powered by the 6.2L HEMI V8, this model is widely regarded as one of the most powerful and versatile mid-size SUVs available in the market. The 6.2-liter engine, part of the renowned HEMI family, delivers approximately 475 horsepower and 470 lb-ft of torque. This immense powertrain allows for rapid acceleration, making the Grand Cherokee a compelling choice for those who want a vehicle that can perform on the track as well as it does off the road. The V8 engine is often paired with the ZF 8HP95 8-speed automatic transmission, known for its smooth shifting and efficiency.
Owners of the 2018 Grand Cherokee appreciate its commanding road presence, comfortable interior, and advanced technology features. The vehicle serves as a capable daily driver that can tow up to 7,200 pounds when properly equipped. It is a popular choice for families, adventurers, and professionals alike. However, the heavy weight of the vehicle and the high performance of the 6.2L engine place significant demands on the drivetrain and cooling systems. Common issues reported by owners include excessive heat generation in the transmission and differential under heavy loads, and the potential for oil degradation in the V8 if standard oils are used for extended periods.
One of the primary challenges with the 6.2L engine is managing the heat generated during towing or spirited driving. Conventional fluids can break down, leading to reduced protection and potential internal damage. Another issue often encountered is the accumulation of deposits in the engine oil and transmission fluid, which can clog passages and reduce efficiency. This is where high-quality synthetic lubricants make a distinct difference. AMSOIL products are specifically designed to resist thermal breakdown and oxidation, ensuring that the fluids remain stable even under the most severe operating conditions.
Furthermore, the 2018 model’s all-wheel-drive system relies heavily on the transfer case and differentials. These components are prone to wear if the lubricant lacks the necessary extreme pressure (EP) additives. Using a premium synthetic gear lube like AMSOIL SEVERE GEAR can prevent this wear and extend the life of the 4×4 system. Additionally, the brake system on such a heavy vehicle requires a fluid that does not absorb water easily, as moisture can lead to corrosion in the calipers and lines. The synthetic brake fluid addresses this concern directly, ensuring consistent pedal feel and safety.
Whether you are driving in extreme winter cold or summer heat, the 2018 Jeep Grand Cherokee 6.2L requires top-tier lubrication to maintain its legendary status. By using AMSOIL synthetic motor oils, transmission fluids, and gear lubes, owners can mitigate common wear issues and ensure their vehicle operates at peak efficiency for thousands of miles to come. The combination of advanced chemistry and rigorous testing makes these products the ideal choice for protecting this powerful machine.