Using the correct oil capacity and grade helps ensure proper lubrication, cooling, and longevity of the engine, especially under heavy towing or commercial use.
In this guide, we break down the oil capacity of the Ram 2500 with the 6.7 Cummins, recommended oil types, change intervals, and helpful maintenance tips.
Ram 2500 6.7 Cummins Oil Capacity
The Ram 2500 with the 6.7L Cummins engine has an oil capacity of 12 quarts (11.4 liters) with a new filter, and it typically uses 15W-40 diesel engine oil for normal climates or 5W-40 full synthetic for cold weather or heavy towing.
| Model Year | Engine Model | Oil Capacity (With Filter) |
|---|---|---|
| 2007 – 2012 | 6.7L Cummins (ISB) | 12 quarts (11.4 liters) |
| 2013 – 2019 | 6.7L Cummins (ISB High Output / Standard Output) | 12 quarts (11.4 liters) |
| 2020 – Present | 6.7L Cummins (Updated Turbo & Emissions Systems) | 12 quarts (11.4 liters) |
Oil change intervals are generally every 7,500 miles under normal driving and 5,000 miles or less for heavy-duty use, towing, or dusty conditions.
Using the correct oil capacity and recommended viscosity ensures proper lubrication, protects the turbocharger, maintains stable oil pressure, and helps the engine last longer.
Always check the oil level after filling and avoid overfilling to prevent foaming and pressure issues.
Related Cummins Engine Oil Filters(Top 3 Best 2025)
Best oil for Ram 2500 6.7 Cummins
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1. Shell Rotella T6 Full Synthetic 5W-40
- Full synthetic diesel engine oil designed for high-performance turbocharged engines.
- Provides strong protection against wear, deposits, and oil breakdown.
- Helps improve cold-weather startup and flow compared to 15W-40 oils.
- Ideal for heavy towing, frequent idling, and colder climates.
2. Valvoline Premium Blue 15W-40 (Cummins-Endorsed)
- Officially recommended and endorsed by Cummins for the 6.7L engine.
- Formulated for diesel engines equipped with EGR and DPF systems.
- Excellent thermal stability and protection under heavy load or work use.
- Great everyday choice for moderate climates and standard service intervals.
3. Mobil Delvac 1300 Super 15W-40
- High-performance diesel engine oil with excellent soot and viscosity control.
- Protects engine parts under high heat and severe operating conditions.
- Maintains stable oil pressure and lubrication during towing and hauling.
- Reliable option for both work trucks and daily driven diesels.
Related 5.9 Cummins Engine Oil Capacity(+ Recommended Oil)
Recommended Oil Type
Ram and Cummins recommend:
- Viscosity: 15W-40 for most climates
- 5W-40 synthetic for colder climates or heavy towing conditions
Oil Change Interval
The general recommended interval is:
Why interval matters: Diesel engines produce soot and contaminants faster than gasoline engines. Dirty oil thickens, reducing lubrication and increasing engine wear.
Why Proper Oil Capacity Matters
Putting the correct oil amount in your 6.7 Cummins is more than a routine detail. The right capacity ensures:
- Proper lubrication of crankshaft & cam surfaces
- Reduced friction and overheating
- Correct oil pressure
- Longer turbocharger life
- Smoother towing performance
Too little oil causes friction and overheating. Too much oil, however, can cause foaming, aeration, and crankcase pressure issues, all of which can damage the engine.
Related Cummins Engine Oil Capacity Chart(For All Models)
Signs Your Oil Needs Changing
Even if you haven’t hit the mileage limit, look for:
- Dark, thick, or gritty oil on the dipstick
- Decrease in fuel efficiency
- Louder engine noise, especially under load
- Oil pressure reading changes
FAQs
How many litres of oil does 6.7 Cummins take?
The 6.7L Cummins engine typically takes 11.4 liters (12 quarts) of engine oil when changing the oil and filter.
What kind of oil does a 2018 Ram 2500 6.7 Cummins take?
A 2018 Ram 2500 with the 6.7 Cummins generally uses 15W-40 diesel engine oil for normal temperatures, or 5W-40 full synthetic in colder climates or heavy-duty towing conditions.
Can you put 15W-40 in a 6.7 Cummins?
Yes, 15W-40 is commonly recommended and works well in moderate or warm climates. For extremely cold weather or heavy towing, switching to 5W-40 synthetic is beneficial for improved cold start and protection.
How much oil does a 2017 Ram 2500 6.7 take?
The 2017 Ram 2500 with the 6.7 Cummins also requires 12 quarts (11.4 liters) of oil when the filter is replaced.
What happens if I overfill my 6.7 Cummins with oil?
Overfilling can cause foaming and aeration, leading to loss of lubrication, increased crankcase pressure, and possible damage to seals and the turbocharger. If overfilled, it’s important to drain the oil back down to the correct level immediately.
