I have a 97 f-250 5.8.w/413,0000 miles. Valve covers have never been off of it! outside of normal accessories water pump,alt, ect. its been a great truck.Question- I am not having any problems with the injectors but with that many miles would you replace them with new ones or have someone run cleaner through them? I do the B-12,sea form ect treatment. I get about 13 MPG with the truck loaded with tools & Freon. I am a A/C contractor. Got the truck w/ 27,000 miles on it back in 2000.Any thoughts or concerns would be great!!

 

If you're getting that good a mileage, it ain't broke, so don't fix it. The injectors are electric solenoids, so they'll last a LONG time.