RE6 vs RE7 spark plugs?
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The RE6 is just a hotter plug to combat the hot start issue that the early 04-05 models were experiencing. Along with the hotter plug, Mazda went with a stronger starter and revised PCM flashes. Rev the engine on occasion and the RE7 plug should be fine. I have a MY07 and will be installing the RE7 soon (no special reason why I got them, just that they were what I got from BHR). I don't expect there to be any issue.
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