The 2018 Ram 2500 with the 6.7-liter Cummins turbodiesel takes about 12 quarts (roughly 11.4 liters) of engine oil when performing a full oil and filter change.
Oil capacity and maintenance details matter for proper engine health and service records. Below is a concise breakdown of the official capacity, recommended oil type, and practical steps for a proper oil change on this model.
Official capacity and what it means
Engine oil capacity is typically listed as the total amount needed for a complete oil change, including a new oil filter. For the 2018 Ram 2500 6.7 Cummins, the standard figure is 12 quarts with a new filter. If you drain the pan and do not replace the filter, or if the vehicle has additional oil-cooling hardware or aftermarket components, the amount may vary slightly. Always verify with the owner's manual or the dipstick during maintenance.
Here are the essential figures and recommendations you should know when planning an oil change.
- Oil capacity with filter: 12 quarts (approximately 11.4 liters)
- Recommended oil type: Synthetic diesel engine oil, typically SAE 5W-40, API CK-4 or newer
- Oil change interval: Generally up to 15,000 miles under normal conditions with synthetic oil; shorter intervals (7,500–10,000 miles) in severe service or extreme temperatures
In short, you should plan to use about 12 quarts of oil with the proper synthetic diesel oil, and follow the maintenance intervals specified in the owner's manual or by your service professional.
How to perform the oil change (quick guide)
If you’re changing the oil yourself, follow these basic steps to ensure a proper fill and level check.
- Raise and secure the vehicle on level ground using ramps or jack stands.
- Place a drain pan under the oil pan and remove the drain plug to drain the used oil.
- Remove the old oil filter, install a new filter, and lightly oil the gasket on the new filter.
- Reinstall the drain plug and slowly pour in 12 quarts of the recommended oil.
- Start the engine, run for a couple minutes, check for leaks, then check the oil level with the dipstick and top up if necessary.
Dispose of used oil and filters according to local regulations. After an oil change, reset the oil life monitor if your vehicle is equipped with one.
Additional considerations
Variations in oil capacity can occur due to aftermarket parts, additional oil cooling equipment, or factory service updates. Always consult the 2018 Ram 2500 owner's manual or a certified service technician for the exact specification for your specific truck configuration.
Summary
For a 2018 Ram 2500 equipped with the 6.7 Cummins, plan to replace roughly 12 quarts of oil when performing a full oil and filter change, using a 5W-40 synthetic diesel oil (API CK-4 or newer). Follow the recommended change intervals and verify the level with the dipstick after refilling to ensure optimal engine performance.