The 2016 Ram 2500/3500 with the 6.7L Cummins turbodiesel requires a 5W-40 synthetic diesel oil that meets API CK-4 (CJ-4) specifications, and the total oil capacity is about 12 quarts with the filter. Always check the owner's manual for the exact figure for your truck configuration.
This article explains the correct oil viscosity and specification, the typical capacity, and practical tips for selecting and maintaining the right oil for a 2016 6.7L Cummins engine, including how to verify the requirement for your specific vehicle and common pitfalls to avoid.
Oil specification you should use
Here is the quick reference you should follow when shopping for oil for this engine:
- Viscosity: 5W-40 synthetic diesel engine oil
- API specification: CK-4 (CJ-4 compatibility is commonly accepted)
- Brand options: Mopar/Chrysler, Cummins, Shell Rotella, Mobil Delvac, Valvoline Premium Blue, among others
- Notes: Ensure the oil is formulated for diesel engines and clearly labeled to meet CK-4/CJ-4 standards
Bottom line: Use a 5W-40 synthetic diesel oil that meets CK-4 or CJ-4. Do not substitute with conventional 15W-40 or gasoline-engine oil.
Oil capacity and change intervals
Understanding capacity and maintenance intervals helps ensure proper lubrication and engine health:
- Oil capacity: approximately 12 quarts (about 11.5–13 quarts depending on filter and model)
- Change interval: typically up to about 15,000 miles with synthetic CK-4 under normal conditions; shorter if towing, heavy use, or extreme temperatures
Conclusion: Always confirm the exact capacity in your owner's manual and use the recommended filter and oil grade. Adjust change intervals based on usage and climate.
Practical tips for buying and maintaining the oil
Practical guidance to help you pick the right oil and maintain your engine effectively:
- Check the owner’s manual and under-hood placard for the required spec and capacity
- Look for 5W-40 and API CK-4 (or CJ-4) marks on the oil label
- Choose a synthetic diesel oil built for high-heat, heavy-duty applications, especially if towing or operating in hot climates
Final note: Adhering to the CK-4/CJ-4 specification and the 5W-40 viscosity helps ensure proper lubrication, fuel economy, and engine longevity, while also supporting warranty requirements.
Summary
The 2016 Ram 2500/3500 with the 6.7L Cummins requires a 5W-40 synthetic diesel oil that meets API CK-4 (CJ-4) specifications, with an oil capacity of about 12 quarts including the filter. Select a reputable synthetic diesel oil labeled CK-4/CJ-4, confirm the exact capacity and OCI in your manual, and adjust maintenance intervals based on towing, climate, and driving style for sustained engine health.