Quote:
Originally Posted by Dave-ROR
Spec for most platinum tipped plugs in most cars is 100k. I replace mine every 60k or so but have never noticed an obvious difference.
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Yep. I replaced mine at about 80K and that was with lots of methanol being injected into the chamber for about 25K miles. So 100K is doable, but figure 60K to 75K as a conservative estimate.