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      11-04-2011, 11:32 AM   #14
Dackelone
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Drives: N54 e82
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Quote:
Originally Posted by M3 09 AND135I 11 View Post
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?

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


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