Selecting the correct motor oil for your 2018 Dodge Durango RT is essential for maintaining the performance and longevity of the 6.4-liter HEMI V8 engine. This specific powertrain demands a high-quality synthetic blend or full synthetic oil that meets the rigorous standards required for its substantial horsepower output. Using the proper viscosity and certification ensures the bearings remain lubricated under extreme pressure and that the variable valve timing system operates without hesitation.
Recommended Oil Specifications
For the 2018 Durango RT, the manufacturer specifies a 0W-40 viscosity grade for optimal performance. This specific rating is engineered to provide adequate protection during cold starts while maintaining a stable film strength at high operating temperatures common in Southern heat or during spirited towing. The oil must also carry the Chrysler MS-11122 certification, which guarantees the additive package is compatible with the emissions system and the unique engineering of the HEMI technology.
Viscosity and Synthetic Technology
The choice between conventional, synthetic blend, and full synthetic oil significantly impacts the Durango's engine protection. While the 0W-40 viscosity is the target, the base oil type determines performance consistency. Full synthetic options offer superior resistance to thermal breakdown and oxidation, ensuring the oil maintains its viscosity over longer change intervals, which is particularly beneficial for vehicles subjected to stop-and-go traffic or heavy trailer hauling.
Performance and Towing Considerations
Drivers who frequently utilize the towing capacity of the Durango RT subject the engine and transmission to immense stress. High-temperature synthetic oils are critical in these scenarios because they resist thinning (shear) under load. This stability ensures the transmission fluid and rear differential receive consistent lubrication, reducing the risk of premature wear on vital drivetrain components during long highway trips with a trailer in tow.
Filter and Capacity Specifications
Maintaining the correct oil capacity is vital when performing maintenance on the 2018 Durango. The engine holds approximately 6.4 quarts of oil, including the filter. Always replace the oil filter with a high-flow design that meets OEM standards to ensure the new oil is filtered effectively. Utilizing a filter that is too restrictive can hinder the performance of the anti-wear additives, while a filter that is too porous fails to trap contaminants.
Oil Change Intervals and Maintenance
Even with the durability of synthetic formulations, regular maintenance remains the biggest factor in engine health. The recommended interval for the 2018 Durango RT is typically 7,500 to 10,000 miles, depending on driving conditions. However, severe duty driving—characterized by short trips, extreme climates, or constant towing—necessitates a shorter change interval to prevent the accumulation of sludge and moisture within the crankcase.
Top Oil Choices for the 6.4L HEMI
Mobil 1 Extended Performance 0W-40 (Meets Chrysler MS-11122)
Castrol EDGE Extended Performance 0W-40 (High-turbulence protection)
Liqui Moly 0W-40 (Excellent cold-start performance and shear stability)
Amsoil Signature Series 0W-40 (Long-drain capability for modified vehicles)
Valvoline MaxLife 0W-40 (Cost-effective synthetic protection)
Prestone Full Synthetic 0W-40 (Compatibility with all driving conditions)
