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I think the stock maintenance program calls for new plugs at the 45k maintenance service. Like Bogart said, if your running higher boost or pushing the car hard, then a shorter interval is advisable. Every 15k should be fine, I've seen plenty of people suggest 10k intervals for those that are heavily modified. I'll probably fall somewhere in the middle and change my plugs once a year.
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2008 E82 N54 || Stage 2 -------- Gone to a good home. |