Use Motorcraft's or Autolite's. I use to have the Bosch Plats. Nothing wrong with them. Just that I didn't know it at the time, that engine rattle I had under full load at highway speed was engine knock. Good thing I didn't do a whole lot of traveling. Replaced the plugs with Motorcraft's Platium finewire tips and the engine rattle went away. Power, mpg, throttle response, all remained the same.