Quote:
Originally Posted by eric97hoh
every 10-15k miles we should change plugs i belive i agree
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For stock I'd agree, though mine at 17/18k look like poop imho. Doubt they'd look much better 3k miles ago. Though again I don't know what was done prior but I'm going by the condition and the stock tuning, I believe it was driven (normal). Personally id say sooner, more like 4-5k miles especially if anyone drives like me and is tuned. Its pretty common to change plugs more often when making more power, these f'er make some serious jam/heat that is a lot of abuse on plugs. Wondering.. someone said the stock bmw plugs are crap, not sure if this is why mine we so bad.
