How Long Will a Deleted 6.7 Cummins Last?

One of the biggest questions diesel owners have before deleting their 6.7 Cummins is: "How long will my engine last after deleting?"

The answer depends on several factors, including driving habits, maintenance, and tuning choices. Let’s break down what affects a deleted Cummins’ lifespan and how you can maximize it.

Does Deleting a 6.7 Cummins Shorten Engine Life?

Contrary to some myths, properly deleting and tuning a 6.7 Cummins can actually extend its lifespan—if done correctly. Here’s why:

✅ Reduced Carbon Buildup – EGR systems recirculate soot, clogging the engine over time. Deleting eliminates this issue.
✅ Lower Engine Temperatures – EGR and DPF systems increase heat stress; removal reduces thermal wear.
✅ Cleaner Oil & Fuel System – Without soot contamination, oil stays cleaner longer, reducing engine wear.

However, poor tuning, excessive power upgrades, or neglecting maintenance can shorten engine life.

How Many Miles Can a Deleted 6.7 Cummins Last?

With proper care, a deleted 6.7 Cummins can easily surpass 300,000–500,000 miles—some even reach 750,000+ miles. Key factors include:

1. Quality of the Delete & Tune

• A professional-grade delete kit (like our EGR Delete Kit) ensures proper airflow and cooling.

• A well-calibrated tune prevents excessive cylinder pressure and premature wear.

2. Maintenance Habits

• Frequent oil changes (every 5,000–7,500 miles with full synthetic).

• Regular fuel filter replacements (every 15,000 miles).

• Cooling system upkeep (prevents overheating).

3. Driving Style

• Towing heavy loads frequently? Ensure your tune supports it.

• Aggressive racing or excessive high-RPM driving? This can wear the engine faster.

Will Deleting Void My Warranty?

Yes—deleting a 6.7 Cummins will void the factory warranty. If your truck is still under warranty, weigh the pros and cons carefully.

How to Maximize Your Deleted Cummins’ Lifespan

✔ Use a conservative tune (avoid extreme horsepower tunes for daily driving).
✔ Monitor engine vitals (EGTs, boost pressure, coolant temps).
✔ Upgrade supporting mods (better cooling, turbo, and fuel systems if pushing big power).

Final Verdict: A Deleted 6.7 Cummins Can Last Longer—If Done Right

When properly maintained, a deleted 6.7 Cummins can outlast a stock engine thanks to reduced soot, heat, and stress. The key is smart tuning, quality parts, and regular maintenance.

Ready to delete your Cummins? Check out our top-rated:
🔗 6.7 Cummins EGR Delete Kit

Want more power? Explore our 6.7 Cummins Performance Upgrades for maximum reliability!