Choose 6.7 Cummins oil by your Ram’s model year and expected outdoor temperature. The 2022 and 2026 Ram 2500/3500 examples specify 10W-30 above 0°F and synthetic 5W-40 below 0°F, while Ram’s 2018 U.S. diesel supplement lists 15W-40 above 0°F. Match the API category and material standard in your own diesel manual before ordering.
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6.7 Cummins Oil by Ram Model Year
| Ram documentation | Above 0°F (−18°C) | Below 0°F (−18°C) | Specification listed |
|---|---|---|---|
| 2018 U.S. diesel supplement | 15W-40 | Synthetic 5W-40 | MS-10902 and API CK-4 in this supplement. |
| 2022 Ram 2500/3500 | 10W-30 | Synthetic 5W-40 | MS-10902 and API CK-4. Read the manual’s CES 20081 note for the warmer-temperature row. |
| 2026 Ram 2500/3500 handbook | 10W-30 | Synthetic 5W-40 | MS-10902 and API CK-4. The 6.4L gasoline engine has separate oil guidance. |
15W-40 restriction. FCA bulletin 09-011-20 warns against 15W-40 in 2019-and-newer 6.7L applications covered by the bulletin because of the valve-train design. Check your truck’s current documentation for the correct grade, especially if you operate across the temperature boundary.
Rotella T6 5W-40 and T5 15W-40 Compared
Shell publishes different grades under both the T5 and T6 names. Compare the complete label, including the viscosity and approvals, before choosing either product.
- T6 5W-40 full synthetic. Consider it when your manual calls for synthetic 5W-40 and the exact jug meets the required material standard. Check T6 5W-40 on Amazon
- T5 15W-40 synthetic blend. Consider it only for a truck and temperature range that allow 15W-40 and where the exact jug meets the required material standard. Check T5 15W-40 on Amazon
Shell Rotella T6 Full Synthetic 5W-40
Shell’s T6 5W-40 technical data sheet lists API CK-4 and Cummins CES 20086. If your Ram calls for MS-10902, confirm that standard for the exact formulation on the label or with the oil maker. An API or Cummins designation alone does not confirm every Ram requirement.
Shell Rotella T5 Synthetic Blend 15W-40
Shell’s T5 product page lists API CK-4 and Cummins CES 20086 for 15W-40. Confirm the Ram material standard separately. If your manual requires 10W-30 for your conditions, compare a correctly documented 10W-30 diesel oil instead.
Checks Before Buying Oil and a Filter
- Confirm the model year and 6.7L diesel configuration from your truck’s records. Use the diesel section of the manual.
- Check the grade for the temperatures you expect before the next oil change. Match the API category and required material standard.
- Check capacity with a new filter. The 2022 Ram capacity table lists 12 U.S. quarts for this example. Use your own manual and verify the dipstick level after service.
- Compare the delivered jug size, pack count and label. The current Amazon package and seller details could not be confirmed.
- Follow the truck’s oil and filter service interval. If you lack the tools to service it safely, use a qualified shop.
Compare the diesel oil selection guide for other grades, and use the oil filter fitment guide when confirming the filter part number.
Check the Bottle Labels
Frequently Asked Questions
What oil should I use in a Ram 6.7 Cummins?
Check the diesel section of your truck’s manual and match the grade for the expected temperature, API category and material standard. Ram’s 2022 and 2026 2500/3500 examples recommend 10W-30 above 0°F and synthetic 5W-40 below 0°F.
Can I put 15W-40 in my 6.7 Cummins?
Ram’s 2018 U.S. diesel supplement lists 15W-40 above 0°F when the oil meets its requirements. FCA bulletin 09-011-20 warns against 15W-40 in 2019-and-newer 6.7L applications covered by the bulletin. Check the manual for your exact truck.
How much oil does a 6.7 Cummins take with a new filter?
The 2022 and 2026 Ram 2500/3500 documentation lists 12 U.S. quarts for the 6.7L engine with a filter. Verify the capacity and final dipstick level for your own truck.
Does full synthetic extend the oil-change interval?
Follow the maintenance schedule and oil-life guidance for your truck. A switch to full synthetic alone does not extend the factory service interval.
