First, never EVER put DEF in the fuel tank. If you do and turn the key, it’s a minimum $10,000 fix.
Watch out for code P207F as your truck gets older. It’s tough to diagnose, and Ford might recommend replacing the NOx module or the SCR system (exhaust filter). It’s a common pain point.
Keep up with fuel filter changes, as a clogged EGR cooler or bad EGT sensors can cause issues. Also, aftermarket air filters can lead to regen problems. The 6.7 can be picky like that.
They’re solid trucks overall. Once the emissions stuff is deleted (down the line), you’ll likely have fewer problems. Let me know if you have any specific questions!
Jamie said:
Check for frame rust—always a concern with older trucks.
The 6.7 is much better than the 6.0 or 6.4. If it’s still under warranty, hold off on any deletes for now.
Deleting emissions components like DEF or EGR can void a powertrain warranty, but it won’t affect body, frame, or ABS claims. Just something to keep in mind.
Be prepared for higher maintenance costs. Diesel repairs are expensive, especially for Fords. The fuel system is sensitive to water and dirt, so use quality filters and change them regularly.
If you don’t tow heavy often, you might have been better off with a gas engine. But if you take care of it, the 6.7 can be a great truck.
One more thing—don’t assume it takes 15 quarts of oil like older models (7.3, 6.0, or 6.4). The standard 6.7 takes 13 quarts, per Ford’s workshop manual.