it gets way to hot and the spark cannot "jump" it stays in one place, as what i have been told, I have torn apart quite a few 4.6's and 1.8t that used +4 and there was just a hole in the piston, valves and springs still completly intact. another thing is for some reason bosch have never run well for me in ford's or vw's. actaully vw and audi are using NGK now. imo, stick with stock plugs unless you mill the head down or running nitrous, turbo, or supercharger, and even then, stick with the same kind that came with the car ie: motorcraft, a/c delco etc... i don't even like going copper on a car that had platinum for f/i.FocusFreak87 said:^^^Can you explain how?
wickedgreyzx3 said:it gets way to hot and the spark cannot "jump" it stays in one place, as what i have been told, I have torn apart quite a few 4.6's and 1.8t that used +4 and there was just a hole in the piston, valves and springs still completly intact. another thing is for some reason bosch have never run well for me in ford's or vw's. actaully vw and audi are using NGK now. imo, stick with stock plugs unless you mill the head down or running nitrous, turbo, or supercharger, and even then, stick with the same kind that came with the car ie: motorcraft, a/c delco etc... i don't even like going copper on a car that had platinum for f/i.
but this is just all my personal experience
can you then please have bosch pull the 69 cent autozone special, bosch superes, from shelves. ThanksJRODSVT said:I work for bosch and I agree Ford cars really do not like Bosch plugs ecspecially 3.0 Duratec in the taurus/sable.