How Much Oil Does the 6.7L Cummins Hold & Maintenance Best Practices

How Much Oil Does the 6.7L Cummins Hold & Maintenance Best Practices

1. How Much Oil Does the 6.7L Cummins Hold?

The oil capacity of a 2019–2024 6.7L Cummins engine is:

 12 Quarts (11.4 Liters) including the oil filter

This capacity applies to both standard and high-output (HO) versions of the 6.7L Cummins used in Dodge RAM heavy-duty trucks.

Pro Tip: Always check the oil level on the dipstick after an oil change — slight differences in capacity can occur depending on how completely the old oil is drained and the type of oil filter used.

2. Why Oil Capacity Matters for Your Cummins

Oil is the lifeblood of your Cummins engine. Having the correct amount ensures:

  • Proper lubrication of pistons, bearings, and turbocharger

  • Efficient cooling of engine components

  • Removal of contaminants like soot and carbon

  • Longer life for high-cost parts like injectors and the turbo

Running low on oil — or overfilling — can cause:

  • Increased wear and tear

  • Poor fuel economy

  • Risk of catastrophic engine damage

3. Recommended Oil Type for the 6.7L Cummins

The Cummins and Mopar OEM recommendation for 2019–2024 models is:

  • API CK-4 Rated Diesel Engine Oil

  • Viscosity:

    • 5W-40 Full Synthetic (best for extreme temps & towing)

    • 15W-40 (best for warmer climates & regular use)

Popular Choices:

  • Mopar OEM Diesel Engine Oil

  • Shell Rotella T6 5W-40

  • Valvoline Premium Blue Extreme Diesel Oil

4. Oil Change Intervals for the 6.7L Cummins

  • Normal driving conditions: Every 15,000 miles or 12 months

  • Severe driving conditions: Every 7,500 miles or 6 months

Severe conditions include:

  • Frequent towing or hauling heavy loads

  • Long idling periods

  • Dusty or dirty environments

  • Extreme hot or cold climates

5. Step-by-Step Oil Change for the 6.7L Cummins

Changing your own oil can save you hundreds over the truck’s lifespan.

Tools & Supplies:

  • 12 quarts of API CK-4 oil

  • Mopar OEM oil filter (Part #68157291AA or equivalent)

  • Oil drain pan

  • 3/8” or 1/2” ratchet & socket

  • Oil filter wrench

  • Funnel & shop towels

Procedure:

  1. Warm the engine for 3–5 minutes to loosen the oil.

  2. Park on level ground and engage the parking brake.

  3. Place oil pan under the drain plug.

  4. Remove the drain plug and allow all oil to drain.

  5. Remove the oil filter with a filter wrench.

  6. Lubricate the new filter’s O-ring with fresh oil.

  7. Install the new filter hand-tight plus 3/4 turn.

  8. Reinstall the drain plug and torque to spec.

  9. Add 12 quarts of new oil via funnel.

  10. Start the engine and check for leaks.

  11. Check the dipstick and adjust oil level if needed.

6. Signs Your Cummins Needs an Oil Change Early

Even if you haven’t reached the mileage limit, change your oil sooner if you notice:

  • Oil that’s black and gritty

  • Low oil pressure warning light

  • Increased engine noise

  • Fuel smell in the oil

  • Overheating

7. Best Practices for Cummins Oil Maintenance

To keep your Cummins engine running at peak performance:

  • Use OEM or high-quality aftermarket filters for proper filtration.

  • Keep oil at the recommended level — check at least once a month.

  • Don’t overfill — excess oil can cause foaming and reduced lubrication.

  • Change fuel and oil filters together to streamline service.

  • Follow OEM service intervals based on your driving conditions.

8. Cost of an Oil Change for a 6.7L Cummins

  • DIY: $70–$120 (oil + filter)

  • Dealership: $150–$250

  • Independent shop: $120–$180

Conclusion

The 2019–2024 6.7L Cummins holds 12 quarts (11.4 liters) of oil, and sticking to proper oil type and maintenance intervals is essential for performance and longevity. By following these best practices, you’ll protect your investment, improve fuel efficiency, and ensure your truck is always ready for the road ahead.

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