Join Date: Apr 2010
Location: Brantford Ontario
Hi there, well with your truck now having 75000k on it, I would be pulling the plugs out of it and installing a new set.
By doing this every 60,000k's, as well as using the special Ford lube on the plug threads, you should be good to go. Better for max. performance and fuel econ. as well.
The longer you leave them in, the greater the odd's are that the plugs won't come out cleanly. I would also recommend that you have a Ford Motorvac (engine decarbonization) done before removeing your plugs, with an oil change to follow.