[wafrederick]

Use the Autolites and these are the best plugs for Fords including Motorcraft.Use the dielectric grease.Avoid Bosch plugs and E-3 plugs.Bosch plugs do not last in Ford products.I have heard E-3 plugs are junk and are not cheap,$20.00 a piece.Put the fuel filter on the list too,always change it during a tune up.If you don't do this,plugs up putting a strain on the fuel pump and kills it