The amount varies by engine. In the 2021 Ram 1500, oil capacity ranges from about 6 to 7 quarts depending on the engine choice.
Engine-by-engine oil capacity
The following figures come from the 2021 Ram 1500 owner's manual and reflect the oil capacity with the filter installed.
- 3.6L V6 eTorque (gas): 6 quarts (with filter)
- 5.7L Hemi V8: 7 quarts (with filter)
- 3.0L EcoDiesel V6: 7 quarts (with filter)
Always verify the exact capacity for your specific vehicle configuration by checking the owner's manual or consulting a dealer, since variations can occur by model, trim, and VIN.
Summary
For a 2021 Ram 1500, oil capacity depends on the engine: 6 quarts for the 3.6L V6, and 7 quarts for both the 5.7L Hemi V8 and the 3.0L EcoDiesel. Use the recommended oil type and filter, and refer to the manual for the precise specification of your truck.