Author: Lars, Diesel Enthusiast & Technical Advisor at SPETUNER
If you're wondering exactly how much oil your 6.7 Cummins needs, you're not alone. Understanding the 6.7 Cummins oil capacity is key to keeping this diesel workhorse running at peak performance, especially if your truck is tuned or deleted. At SPETUNER, we specialize in high-performance delete kits and tuning components, but none of that means anything without proper engine care. Let's dive into what every 6.7 Cummins owner should know.
6.7 Cummins Oil Capacity (By Year & Filter Status)
A properly oiled Cummins engine doesn’t just run — it roars. For most 6.7L Cummins engines, the oil capacity is:
6.7 Cummins Oil Capacity by Year
| Model Year | With Filter | Without Filter | Notes |
|---|---|---|---|
| 2007.5–2018 | 12 quarts | ~11.5 quarts | Includes OEM oil filter |
| 2019–2024 | 12–13 quarts | ~12 quarts | Some RAM variants may vary |
Note: Cab & Chassis configurations or aftermarket oil pans may increase capacity slightly. Always verify via dipstick.
Best Oil for 6.7 Cummins Diesel Engine
Your 6.7 Cummins deserves oil that can handle heat, load, and longevity — especially when tuned or deleted.
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Recommended Oil Types: Fully synthetic 5W-40 or 15W-40 oils that meet API CK-4 specs.
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Cold Start Consideration: In colder climates, 5W-40 provides better protection.
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Heavy-Duty Use: For heavy towing or deleted trucks, a robust oil like 15W-40 offers improved film strength.
SPETUNER does not sell oil products, but we highly recommend using Cummins-approved oil to protect your performance mods.
6.7 Cummins Oil Change Interval & Checklist
Changing your oil is one of the most critical tasks in maintaining your truck’s performance, especially if it’s tuned or deleted.
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Standard Interval: Every 7,500–10,000 miles.
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Heavy-Duty / Deleted Trucks: Every 5,000–7,500 miles is ideal.
How to Change the Oil in a 6.7 Cummins: Step-by-Step
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Warm up the engine for 5–10 minutes.
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Remove the drain plug and let the oil fully drain.
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Remove and replace the oil filter.
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Reinstall the plug and fill with new oil (usually 12 quarts).
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Check oil level via dipstick and top off as needed.
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Start engine, idle for 2–3 minutes, and check for leaks.
Pro Tip: After tuning or hard driving, recheck your oil level sooner than usual.
6.7 Cummins Crankcase Filter: When & Why to Change
This often-overlooked component plays a big role in engine and emissions system performance.
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Recommended Replacement Interval: Every 15,000–20,000 miles
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Why it matters: A dirty crankcase filter can lead to increased crankcase pressure, pushing oil past seals and creating tuning inconsistencies.
Especially important for deleted systems where excessive pressure can interfere with turbo seals and intake flow.
Oil Maintenance Tips for Tuned & Deleted Cummins Owners
Modified engines require modified habits. Here are some advanced maintenance insights for deleted/tuned 6.7 Cummins trucks:
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Use bypass filtration systems if you're running extended oil intervals or producing higher soot levels.
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Check for oil weeping at the turbo and intercooler boots — pressure spikes from tuning can expose weaknesses.
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Monitor crankcase pressure if using performance tuning with high boost. Excess pressure often signals a clogged filter or blow-by issue.
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Avoid low-grade oils even in moderate climates — deleted trucks run hotter and need thermal stability.
Common 6.7 Cummins Oil Problems & How to Fix Them
Here are common oil-related issues seen in tuned or deleted Cummins setups:
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Excessive oil consumption – Turbo seal wear or PCV system blockage
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Low oil pressure warning – Worn oil pump or soot-clogged pickup tube
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Unstable idle/black smoke – Oil entering the intake from crankcase ventilation
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Milky oil – Possible coolant-oil mix from head gasket or cooler failure
Always pair oil troubleshooting with inspection of tuning equipment and delete hardware. Contaminated oil can damage more than just internal components.
Frequently Asked Questions about 6.7 Cummins Oil Maintenance
Q1: How much oil does a 6.7 Cummins engine need?
A1: A 6.7 Cummins engine typically requires about 12 quarts, including the filter. For specific year-based differences, check out our oil capacity guide above.
Q2: What is the best oil for a 6.7 diesel?
A2: We recommend fully synthetic 5W-40 for most conditions, or 15W-40 for heavy towing. Just make sure it meets API CK-4 specs.
Q3: Should I shorten oil change intervals on a tuned or deleted Cummins?
A3: Absolutely — stick to 5,000–7,500 miles if your truck is deleted or heavily tuned.
Q4: Can poor oil cause issues with tuning or delete systems?
A4: Yes. Dirty or broken-down oil can affect sensor accuracy, increase heat, and cause performance losses.
Q5: How can I protect my engine after tuning or deletion?
A5: Stick to high-quality maintenance, especially oil-related tasks. And make sure you’re running trusted SPETUNER delete kits and cooling upgrades.
Q6: Where can I find delete kits and parts for my 6.7 Cummins?
A6: Right here at SPETUNER. We offer the industry’s best in EGR/DPF delete packages, custom tuning, and diesel cooling upgrades.
Final Thoughts
Every 6.7 Cummins truck is a performance beast waiting to be unleashed. But no matter how much power you add, it starts with the basics — oil, filters, and maintenance.
Explore our full line of EGR delete kits, custom tunes, and cooling solutions designed specifically for 6.7 Cummins platforms. At SPETUNER, we help you build it fast — and keep it running strong.
Ready to upgrade your diesel? Shop SPETUNER delete packages now.
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