Which plug would you use factory, NGK copper core, NGK platinum 4
and seeing how i have not done it on an audi yet do i need the rubber insert for the socket to not damage the plug when removing and installing
All of the audi forums that I have searched have gap variations ranging from .028 to .044. Anyone know for sure what the correct gap setting should be for my vehicle and spark plug? I know the torque setting is 22 ft/lbs.
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