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Originally Posted by TittoBlunt
Maybe incorrect plug gaps? You would hope the dealer checks the gaps before installing but you never know.
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I was under the impression that n54 plugs with the 3 grounds are pretty much not able to be gapped any more than they Are due to their design. When I did plugs, they didn't need to be gapped, nor did anyone I spoke to who are BMW techs sai they needed to be gapped if you bought OEM plugs. The NGK's are a different story... But why would the dealer put in NGK?