The 6.7-liter Cummins Turbo Diesel used in Ram trucks typically requires about 11 to 12 quarts of oil per change, which converts to roughly 10.5 to 11.4 liters. The exact amount depends on whether you replace the oil filter during the change and on the model year.
Standard oil capacity in practice
Two common figures guide most oil-change planning: the amount with a new filter installed and the amount if the filter is not replaced. These values can vary slightly by year and configuration, but stay within a consistent practical range.
- With a new oil filter installed: about 12 quarts (approximately 11.4 liters).
- Without replacing the filter: about 11 quarts (approximately 10.4 liters).
These figures appear in service manuals and common maintenance references. For precise requirements, check your specific year/model in the owner's manual or a dealership service bulletin.
Why capacity can vary
Differences in oil filter size, oil cooler configurations, and optional equipment can lead to slight variations. In practice, most owners work within the 10.5–11.4 liter window for an oil change.
Maintenance tips
Oil grade and specifications
Use the viscosity and API/Cummins specification recommended in your manual—commonly 5W-40 synthetic for modern ISB 6.7 engines, with alternatives like 15W-40 in certain climates or older builds.
Oil level check and fill procedure
Drain the oil completely, install a new filter, then add oil gradually to reach the full capacity. Check the dipstick with the engine off on level ground and top up as needed to the correct mark.
Summary
In short, plan for approximately 10.5–11.4 liters of oil for a standard 6.7 Cummins oil change, depending on whether you replace the filter and the exact model year. Always confirm with the manual or a dealer for your specific engine.