Quote:
Originally Posted by wstar
I'm still on the original factory spark plugs at ~40K miles and lots of dyno pulls and track weekends. I picked up a replacement set because it's kind-of about time to just do it before they ever become a problem, but honestly they could probably go quite a bit longer.
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I never looked at what we have but I know the ngk iridium IX plugs on my WRX were good till 60k. Being turbo'd they should be abused more but if we get a cheaper plug then 40k seems pretty smart to change them out.