In short, it depends on the engine. Gasoline-powered 2014 Ram 2500 models typically use synthetic 5W-20 oil, while the diesel-equipped Ram 2500 with the 6.7L Cummins generally requires 15W-40 oil that meets CJ-4 standards. Always check the owner’s manual or the under-hood oil fill label for the exact specification.
The 2014 Ram 2500 line offered two gasoline engines (5.7L Hemi and 6.4L Hemi) and one diesel option (6.7L Cummins Turbo Diesel). Oil requirements vary by engine and climate, and adherence to the correct viscosity and API specification helps protect emissions systems and engine longevity. The following guide outlines the typical recommendations by powertrain to help owners verify the right oil.
Gasoline engines: 5.7L Hemi and 6.4L Hemi
Before listing the recommended oils, note that Mopar’s guidance for these gasoline engines centers on a synthetic multi-viscosity oil, commonly 5W-20, with 5W-30 as an acceptable alternative in some climates or situations as specified by the manual. Always confirm the exact grade on the oil fill cap or in the owner’s manual.
- Recommended oil: Synthetic motor oil, typically 5W-20 (API SN/SN+ or newer; ILSAC GF-5 or newer).
- Capacity: Approximately 7 quarts with filter for the 5.7L Hemi; the 6.4L Hemi may require a similar or slightly greater amount depending on configuration.
- Notes: Full-synthetic oil is preferred for protection and cold-start performance; follow climate-based recommendations from the manual.
Gasoline engines conclusion: Use the grade and capacity specified by your exact engine variant and climate in the owner’s manual or on the oil fill cap; if 5W-20 is listed, it’s the standard choice, with 5W-30 as an alternative where allowed.
Diesel engine: 6.7L Cummins Turbo Diesel
Diesel engines in the 2014 Ram 2500 require a heavier-weight oil designed for high heat and soot management. The Cummins 6.7L Turbo Diesel typically calls for 15W-40 CJ-4 (API) for that era. Some operators may use a synthetic 5W-40 that meets CK-4 guidelines if approved by Ram and documented in service literature, but the stock specification is 15W-40 CJ-4.
- Recommended oil: 15W-40 CJ-4 (API).
- Alternative: 5W-40 synthetic meeting API CK-4, if approved by Ram for the particular VIN and service interval.
- Capacity: About 11 quarts with filter, depending on configuration.
Diesel conclusion: Follow the owner’s manual for the exact viscosity and CJ-4/CK-4 specification, and use the correct fill quantity for your 2014 Ram 2500’s engine configuration.
Bottom-line notes
Oil specification can vary by engine code, climate, and service interval. Always verify the exact grade, API specification, and capacity for your VIN in the 2014 Ram 2500 owner’s manual or the under-hood placard. Using the recommended lubricant helps protect the engine and emissions equipment over the life of the vehicle.
In summary, the 2014 Ram 2500’s oil choice is engine-specific: gas variants typically use 5W-20 synthetic oil (with 5W-30 as an allowed alternative in some conditions), while the 6.7L Cummins diesel requires 15W-40 CJ-4, with an approved CK-4 option only if specified by Ram. Always confirm via the owner’s manual or Ram’s service documentation for your exact engine and climate.
Summary: Correct lubricant selection—matched viscosity and API/CJ-4/CK-4 specification—ensures optimal protection and performance for your 2014 Ram 2500, whether you drive a gas-powered Hemi or the Cummins diesel.