Ford Performance M-12405-35T Spark Plugs
This is the Ford Performance one step colder plug. Needs to be gapped to 0.026-0.028 For tuned trucks, it’s recommended to change plugs every 15-20,000 miles. If you’ve got a high mileage truck and haven’t changed them, good idea to do so. If you’ve bought a pre owned truck with above 30,000 miles and are unsure if they’ve been changed, also a good idea to do so.