Quote:
Originally Posted by M3 09 AND135I 11
Nice write up.
OP, do you think they have to be changed sooner than 40,000 miles if one tracks the car lets say 8-10 times a year?
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I think changing the plugs every 40K miles is fine. Even with a tune or hard use. I would also make sure your air filter is clean and no sand or rocks in the filter housing.
135i air filter replacement DIY...
http://www.1addicts.com/forums/showt...air+filter+diy
Dackel