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Originally Posted by Beav
No plug is pure platinum. Some are sold as platinum, some as double platinum. The difference is whether just the center electrode is tipped or both the center and ground electrodes are tipped. This is also why platinum plugs are not supposed to have their gaps checked - the platinum coating is so thin that a feeler gauge can scrape through the coating - presto! you just turned your $75 set of plugs into a set of $12 plugs.
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Thanks but I was trying to make it understandable for someone who isn't going to change their plugs because it'll cost 'em $300 and are afraid they can't do it on their own.
