The engine oil capacity for Ram’s 6.7-liter Cummins turbo diesel, used in the Ram 3500, is about 15 quarts (roughly 14.2 liters) when performing a full oil change with a new filter.
Understanding exactly how much oil you need matters for maintenance accuracy and avoiding overfill, which can affect engine performance and emissions systems. Oil capacity can vary slightly by model year, oil filter choice, and whether you perform a maintenance-only drain or a full change. Here is a practical guide to what you should expect and how to handle an oil change on this engine.
Baseline oil capacity for the 6.7L Cummins
Before listing the typical figures, note that the official specification most often cited for a complete oil change with filter is around 15 quarts. Some owners report smaller figures if the filter isn't counted or for certain service scenarios; the following values reflect common industry guidance.
- With filter: 15 quarts (approximately 14.2 liters)
- Without filter: roughly 13-14 quarts (about 12.3-13.2 liters)
When in doubt, always verify with the Ram owner's manual for your exact model year, or check the dipstick after a change to confirm the oil level sits between the low and full marks.
Practical steps for an oil change on the 6.7L Cummins
To perform or prepare for an oil change, follow these steps and keep the capacity in mind as you fill and check the level.
- Prepare the correct quantities: have 15 quarts on hand (some will go in initially, then you’ll top off to the correct level after starting and checking the dipstick).
- Use the recommended oil grade: 5W-40 Full Synthetic is commonly advised for the 6.7L Cummins, depending on climate and vehicle spec.
- Replace the oil filter with a compatible filter designed for the 6.7L Cummins.
- Warm the engine to operating temperature, drain, replace the drain plug, install new filter, and fill with oil up to about the full mark on the dipstick.
- Start engine, run for a minute, shut off, wait a few minutes, re-check the level and top off as needed to reach full.
Following these steps ensures the engine has the correct oil volume and that the level is accurate after the change.
Alternative considerations by model year
Newer Ram 3500 models with updated emissions systems and filters can have slightly different recommendations. Always consult the owner's manual or dealership guidance for your specific year and configuration to avoid overfilling or underfilling, which can affect engine performance and warranty.
Summary
In short, plan for about 15 quarts (14.2 liters) of engine oil when performing a full change with a filter on the Ram 3500’s 6.7L Cummins engine. Expect a few quarts less if you are not replacing the filter, and verify the exact spec for your year and oil grade. Always verify with the owner's manual and use the dipstick to confirm the correct level after an oil change.