Originally Posted by Tothemax
Why are you replacing the spark plugs so often?
If he is tuned, that's why. Turbo vehicles destroy plugs. Ford was retarded when they wrote the maintenance interval on those for 100k miles. Many people routinely are changing them at 20-25k to find them near the end of their life and having gap issues or having hesitation issues as well.
Hell the plugs on my Supra are changed every time the oil gets changed. Very very small price to pay to ensure you aren't having any spark or blowout issues.
Even if not tuned, replacing at just slightly higher intervals than that is recommended.
It's $20 and 45 minutes of your time to ensure the truck is running great in that department. Cheap insurance.