For Ram 2500 and Ram 3500 pickups equipped with the 6.7L Cummins turbo diesel, the listed engine oil capacity is 12 US quarts (11.4 liters), including the oil filter. This specification is listed in the 2022 Ram 2500/3500 owner’s manual.
The correct oil viscosity and specification also matter when servicing the engine. The recommendations below use the 2022 Ram manual as a reference. Always confirm the requirements for your specific model year and vehicle application before adding oil or performing an oil change.
6.7 Cummins Oil Capacity at a Glance
| Specification | Capacity |
| Engine | 6.7L Cummins turbo diesel |
| Vehicle application | Ram 2500/3500 pickup |
| Engine oil capacity with filter | 12 US qt |
| Metric capacity | 11.4 L |
| US gallons | 3 gal |
Important: The 12-quart figure is the listed service capacity for the referenced Ram pickup application. It should not automatically be applied to every vehicle or piece of equipment powered by a 6.7L Cummins engine.
Does the 6.7 Cummins Oil Capacity Include the Filter?
Yes. The listed 12 US quarts (11.4 liters) is the engine oil capacity with the oil filter for the referenced Ram 2500/3500 application.
When changing the oil and filter, follow the vehicle’s service procedure and refill gradually. The amount needed during an actual oil change can depend on how completely the old oil drains and whether the service procedure or engine configuration differs. Do not rely on the nominal capacity alone to determine the final oil level.
After refilling, check the dipstick and correct the level as needed. Avoid overfilling, which can cause engine damage. If you also need to identify the correct replacement filter, see our guide to the 6.7 Cummins oil filter, including filter part numbers and cross-reference information.
When sourcing replacement filters for diesel engine maintenance, browse our Fleetguard filter range to explore oil, fuel, and air filtration options. Confirm compatibility with your specific engine and application before ordering.
What Oil Does a 2022 Ram 6.7 Cummins Use?
The 2022 Ram owner’s manual lists the following engine oil recommendations for its 6.7L diesel engine:
| Ambient temperature | Recommended oil |
| Above 0°F (−18°C) | SAE 10W-30 |
| Below 0°F (−18°C) | SAE 5W-40 synthetic |
The manual specifies that the oil must meet FCA Material Standard MS-10902 and API CK-4. It also states that products meeting Cummins CES 20081 may be used.
These recommendations are specific to the referenced 2022 Ram application. Do not assume the same viscosity or specification applies to every model year. Check the manual for your truck before selecting engine oil, especially if you operate in very cold weather.
How to Check the Oil Level After an Oil Change
Correct oil capacity is only part of an oil change. The final dipstick reading is important because both insufficient oil and overfilling can damage the engine.
- Park on level ground. A level surface helps produce a more accurate dipstick reading.
- Refill gradually. Add oil according to the vehicle’s service procedure instead of pouring in the entire nominal capacity without checking.
- Allow the oil to settle. Follow the specified procedure for your vehicle. The 2022 Ram manual recommends checking about five minutes after shutting off a fully warmed engine.
- Check the dipstick. Remove it, wipe it clean, reinsert it fully, and remove it again to read the level.
- Adjust if necessary. Keep the oil within the dipstick’s marked range. Add small amounts if low, and recheck the reading.
- Inspect for leaks. Check around the oil filter and drain plug after service.
For a broader overview of routine servicing, see our Cummins engine maintenance guide for other maintenance checks and service considerations.
Does Every 6.7L Cummins Have the Same Oil Capacity?
Not necessarily. The 12-quart specification cited here is documented for Ram 2500/3500 pickups equipped with the 6.7L diesel engine. It should not be treated as a universal capacity for every application using a 6.7L Cummins.
Model year, vehicle configuration, and the manufacturer’s service specifications all matter when selecting fluids and determining service quantities. Before an oil change, check the capacity and oil requirements in the owner’s manual for the exact vehicle being serviced.
If you are maintaining a different vehicle or equipment application, use its own service documentation rather than relying on the Ram pickup figure.
Conclusion
For Ram 2500/3500 pickups covered by the referenced specification, the 6.7 Cummins oil capacity is 12 US quarts (11.4 liters) with the oil filter. The 2022 Ram manual lists SAE 10W-30 for ambient temperatures above 0°F (−18°C) and SAE 5W-40 synthetic below that temperature, subject to its stated oil specifications.
Before servicing the engine, confirm the capacity and oil requirements for your specific vehicle. Refill gradually, check the dipstick on level ground using the recommended procedure, and avoid both underfilling and overfilling.
Frequently Asked Questions
How many quarts of oil does a 6.7 Cummins take?
The documented capacity for the 6.7L diesel engine in the referenced Ram 2500/3500 pickup application is 12 US quarts (11.4 liters), including the oil filter.
Does the 6.7 Cummins oil capacity include the oil filter?
Yes. The published 12-quart capacity is listed as “Engine Oil With Filter.” Follow the service procedure for your specific vehicle when replacing the oil and filter.
Can I add all 12 quarts at once?
It is better to refill gradually and check the dipstick rather than assume the engine needs the entire nominal amount immediately. The final level should remain within the dipstick’s marked range.
Does 6.7 Cummins oil capacity vary by model year?
The capacity cited here is confirmed in the referenced Ram owner’s manual. Verify the specifications for your exact model year and application instead of assuming that every 6.7L Cummins installation has the same capacity.
