Complete Oil Specifications
The owner’s manual for the 2023 Ram 2500/3500 with the 6.7L Cummins diesel recommends SAE 10W-30 engine oil meeting Material Standard MS-10902 in ambient temperatures above 0°F (-18°C), and says the API CK-4 engine oil category is required. Below 0°F (-18°C) it recommends SAE 5W-40 synthetic oil meeting MS-10902 with API CK-4. Products meeting Cummins CES 20081 may also be used. Engine oil capacity is 12 quarts (11.4 liters) with the filter.
When to Change the Oil
The Ram has an engine oil change indicator that displays “Oil Change Due” when it’s time. For diesel engines the manual says oil change intervals should never exceed 15,000 miles (24,000 km) or 12 months, whichever comes first, or sooner if the indicator prompts; the diesel maintenance plan also lists 500 hours. If a B20-capable pickup runs on more than 5% biodiesel, the limit drops to 12,500 miles (20,000 km) or 400 hours. Severe service may reduce oil change intervals.
What We Couldn’t Confirm
- Capacity without the filter, OEM oil filter part number and drain plug torque. None appear in the owner’s manual.
FAQs
What oil does a 2023 Ram 3500 6.7L Cummins take? SAE 10W-30 meeting MS-10902 with API CK-4 above 0°F (-18°C), or SAE 5W-40 synthetic meeting MS-10902 with API CK-4 below 0°F.
How much oil does the 6.7L Cummins hold? 12 quarts (11.4 liters) with the filter.
How often should I change the oil? When the oil change indicator says so, and never more than 15,000 miles or 12 months, whichever comes first (12,500 miles or 400 hours on B20-capable pickups running more than 5% biodiesel).