I use these on my customized 1.8 ton Beetle. I try to change them at every oil change, but I've put a whopping 10,000 miles on one set. They looked a little dirty but still worked decently. (It slows down a bit when idling, but it's not noticeable under load). Great plugs at a great price. However, make sure you close them. They are too big for my taste.
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