Quick answer: the 2019–2025 Ram 2500/3500 6.4L Hemi takes 7 qt (6.6 L) of SAE 0W-40 with a filter change. The 6.7L Cummins turbo diesel takes 12 qt (11.4 L) of 10W-30 (above 0°F) or 5W-40 synthetic (below 0°F), API CK-4, meeting MS-10902.
| Engine | Oil capacity (with filter) | Oil type |
|---|---|---|
| 6.4L Hemi V8 | 7 qt (6.6 L) | 0W-40 (MS-12633; MS-A0921 from 2022) |
| 6.7L Cummins I6 turbo diesel | 12 qt (11.4 L) | 10W-30 above 0°F / 5W-40 synthetic below 0°F, API CK-4 (MS-10902) |
The Cummins oil depends on the temperature. Use 10W-30 above 0°F (-18°C) and 5W-40 synthetic below.
Oil capacity by year
| Model year | 6.4L Hemi | 6.7L Cummins |
|---|---|---|
| 2019 | 7 qt | see diesel supplement |
| 2020 | 7 qt | 12 qt |
| 2021 | 7 qt | 12 qt |
| 2022 | 7 qt | 12 qt |
| 2023 | 7 qt | 12 qt |
| 2024 | 7 qt | 12 qt |
| 2025 | 7 qt | 12 qt |
We read the fluid capacities table and the engine fluids section of every manual listed under Sources.
Recommended oil type
6.4L Hemi: SAE 0W-40 meeting MS-12633 (2019–2021) or Mopar 0W-40 full synthetic meeting MS-A0921 (2022–2025).
6.7L Cummins: above 0°F (-18°C), 10W-30; below 0°F, 5W-40 synthetic. API CK-4 required, meeting MS-10902; oils meeting Cummins CES 20081 may also be used.
How to reset the oil change light on the 2019–2025 Ram 2500 and 3500
See also: Oil life reset by brand.
Most of these owner’s manuals describe two ways to reset the oil change indicator after an oil change: in the instrument cluster display, go to the Oil Life item and confirm Reset; or, with the ignition in ON/RUN and the engine off, fully press the accelerator pedal slowly three times within 10 seconds, then turn the ignition off. Check your manual for the exact menu on your model.
Oil change tips
- 6.7 Cummins: buy 3 gallons.
- 6.4L: a 5-quart jug plus two quarts.
- The capacity is approximate. After refilling, run the engine briefly, turn it off, wait a few minutes and check that the level is in the safe range on the dipstick before adding more.
Sources and how we checked
All capacities and oil grades on this page come from the owner’s manuals published by FCA US (Stellantis) on Mopar’s official owner site (“Technical Specifications”: fluid capacities and engine fluids and lubricants):
- 2019 Ram 2500/3500 owner’s manual
- 2020 Ram 2500/3500 owner’s manual
- 2021 Ram 2500/3500 owner’s manual
- 2022 Ram 2500/3500 owner’s manual
- 2023 Ram 2500/3500 owner’s manual
- 2024 Ram 2500/3500 owner’s manual
- 2025 Ram 2500/3500 owner’s manual
If your owner’s manual shows something different, follow your manual and tell us.
Last checked: October 26, 2026.
FAQ
How much oil does a 6.7 Cummins take?
12 qt (11.4 L) with a filter change in 2020–2025 Ram 2500/3500 manuals.
What oil does a 6.7 Cummins use?
10W-30 above 0°F (-18°C) or 5W-40 synthetic below, API CK-4, meeting MS-10902.
How much oil does a Ram 2500 6.4 Hemi take?
7 qt (6.6 L) of SAE 0W-40.
Can I use 15W-40 in a 6.7 Cummins?
The 2020–2025 manuals list 10W-30 and 5W-40; check your manual.
How do I reset the oil light on a Ram HD?
Use the Oil Life item in the cluster display.
Engine page: 6.7 Cummins oil capacity. Light duty: Ram 1500.