The 6.7 Cummins engine is a popular choice among diesel truck owners due to its power, durability, and reliability. Whether you’re performing regular maintenance or planning an oil change, one common question arises: how much oil does a 6.7 Cummins engine take? Knowing the correct oil capacity is crucial to maintaining engine health and performance.

Oil Capacity of 6.7 Cummins

The 6.7-liter Cummins engine’s oil capacity depends slightly on the model year and whether it is paired with a manual or automatic transmission. Here’s a general guideline:

  • 6.7 Cummins Diesel (2007–Present, Most Models): Approximately 12 quarts (11.4 liters) of engine oil with filter change.

  • Older or Special Versions: Some early 2007–2009 models may take slightly less, around 11 quarts (10.4 liters).

Always check your owner’s manual for the exact oil capacity for your specific model year and configuration. Overfilling or underfilling can lead to engine damage or poor performance.

Recommended Oil Type

Using the correct oil type is just as important as using the right quantity. Cummins recommends:

  • API CJ-4 or CK-4 diesel engine oil

  • SAE 15W-40 or 5W-40 (depending on climate and driving conditions)

  • High-quality synthetic or semi-synthetic oil for optimal protection

Signs You May Have an Oil Issue

Regularly checking your engine oil level can prevent serious problems. Some signs of oil issues include:

  • Engine running louder than usual or knocking sounds

  • Warning lights on the dashboard

  • Dark or thick oil when checked with the dipstick

  • Reduced fuel efficiency or performance

Tips for Changing Oil in a 6.7 Cummins

  1. Warm Up the Engine: Slightly warm oil flows more easily during a change.

  2. Replace the Oil Filter: Always replace the oil filter when changing oil.

  3. Use a Quality Funnel: Prevent spills and ensure all oil goes into the engine.

  4. Check the Dipstick After Filling: Make sure the oil level is within the safe range.

  5. Dispose of Used Oil Properly: Follow local regulations for environmental safety.

Conclusion

The 6.7 Cummins engine typically takes around 12 quarts (11.4 liters) of oil with a filter change, though exact amounts vary by model year and configuration. Using the correct oil type and regularly monitoring levels ensures your engine runs smoothly, maintains performance, and enjoys a long service life. Proper maintenance, including timely oil changes, is essential to get the most out of your 6.7 Cummins diesel engine.