To keep this engine running at its best, understanding its oil capacity and proper maintenance schedule is crucial.
In this guide, we’ll break down the 6.7 Cummins oil capacity, oil type recommendations, oil change interval, and tips for choosing the right oil.
6.7 Cummins Oil Capacity
The 6.7 Cummins oil capacity is 12 quarts (11.4 liters) of engine oil when changing the oil and filter, which applies to most Ram 2500, 3500, 4500, and 5500 trucks from 2007.5 to the present. The recommended oil type is 15W-40 for normal climates and 5W-40 full synthetic for colder weather or heavy towing.
| Engine Model | Application | Oil Capacity (With Filter) | Oil Capacity (Without Filter) |
|---|---|---|---|
| 6.7 Cummins (2007.5 – Present) | Ram 2500 / 3500 / 4500 / 5500 | 12 Quarts (11.4L) | 10.5 – 11 Quarts (Approx.) |
| 6.7 Cummins Industrial/Commercial | Generators, Medium-duty trucks | May Vary | Refer to Equipment Manual |
Oil change intervals vary based on use, with 7,500 miles suggested for normal driving and 5,000 miles for towing, hauling, or commercial use.
Always use a high-quality diesel-rated oil (API CK-4 or CJ-4) and check the dipstick after filling to avoid overfilling.
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Best Oils for the 6.7 Cummins Engine
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1. Valvoline Premium Blue Extreme 5W-40 Full Synthetic (The “Cummins Official Oil”)
Features:
- Factory-endorsed by Cummins, making it a trusted OEM choice
- Excellent high-temperature protection for turbocharged diesel engines
- Reduces engine deposits for cleaner internal components
- Meets Cummins CES 20081 and API CK-4 performance standards
2. Shell Rotella T6 Full Synthetic 5W-40
Features:
- Full synthetic formula offers excellent cold start protection
- Designed to handle high heat and heavy towing
- Helps reduce engine wear and soot buildup in diesel engines
- Meets API CK-4 and Cummins CES 20081 requirements
3. Mobil Delvac 1 ESP 5W-40 Full Synthetic
Features:
- Engineered for extended drain intervals and heavy-duty diesel use
- Strong protection against oxidation, wear, and thermal breakdown
- Enhances fuel economy and maintains stable viscosity under load
- Meets or exceeds API CK-4, CJ-4, and Cummins specifications.
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How to Check Oil Level in a 6.7 Cummins
- Park on level ground.
- Turn off the engine and wait at least 5 minutes.
- Pull the dipstick, wipe clean, reinsert, and pull again.
- Oil level should be between the MIN and MAX marks.
- Add oil in small amounts if needed, do not overfill.
Choosing the Best Oil Filter
Because the 6.7 Cummins handles high pressure, using quality oil filters is essential. Cheap filters may allow contaminants to circulate or collapse under pressure.
Top recommended filter brands:
- Fleetguard (Cummins OEM)
- Wix
- Baldwin
- Mobil 1
- Amsoil
Filters designed to capture soot and maintain pressure stability work best for diesels.
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Signs It’s Time for an Oil Change
Even if you haven’t reached the mileage interval, watch for:
- Increased engine noise or tapping
- Drop in fuel economy
- Dark, gritty oil on dipstick
- Frequent towing or long idling periods
If any of these apply, change oil sooner.
FAQs
How much oil does a 6.7 L Cummins hold?
A 6.7 L Cummins engine holds 12 quarts (11.4 liters) of engine oil when changing both the oil and the oil filter.
What is the best oil for a 6.7 Cummins?
Some of the best oils for a 6.7 Cummins include Shell Rotella T6 5W-40, Mobil Delvac 1 ESP 5W-40, and Valvoline Premium Blue Extreme 5W-40, as they meet Cummins specifications for heavy-duty diesel performance.
Can you put 15W-40 in a 6.7 Cummins?
Yes, 15W-40 is recommended for normal to hot climates, while 5W-40 full synthetic is better for colder weather or heavy towing.
How much oil does a 2018 Ram 3500 6.7 Cummins take?
A 2018 Ram 3500 with the 6.7 Cummins takes 12 quarts (11.4 liters) of oil when the filter is changed.
What happens if I overfill my 6.7 Cummins with oil?
Overfilling can cause foaming, increased crankcase pressure, oil seal leaks, loss of lubrication, and potential turbocharger damage, so it’s important to fill only to the recommended dipstick level.
How many liters are in a 6.7 Cummins?
A 6.7 Cummins requires 11.4 liters of oil when changing both the oil and filter.
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Final Thoughts
Maintaining the correct 6.7 Cummins oil capacity, 12 quarts with filter, and using the proper oil viscosity is essential for keeping your engine strong and reliable. Diesel engines work under intense conditions, and the 6.7 Cummins is no exception.
Regular oil changes, quality filters, and the right oil type will help ensure your truck continues to deliver the performance and durability Cummins engines are known for.
