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I agree with Frank on this, we have a parts industry that pushes parts based on planned obsolesance as X miles of use and not on when parts are worn out. Windshied wipers every 3 months, bateries every couple of years, give me a break.
To answear the OP's question, I read a book by a Dr. Jacobs (yes the guy that has a company named after him) and he said go with basic plugs that meet the heat range required by your engine.
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