I have searched through various threads but could not find an answer to how often to change the JCW/GP spark plugs. I saw everything from every oil change to 100,000 miles. Since the intercooler has to be removed to change the plugs on the GP, I do not want to change them more than necessary but I also want to change them frenquently enough to maintain optimal performance.
I am thinking every 30,000 miles, which I just passed.
Any other interval suggestions?
I plan to install Brisk Silver Racing plugs # BRSK-DR12S.