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Old 12-06-2012, 11:46 PM   #1
TramRam
Registered User
 
Join Date: Aug 2012
Location: SoFla
Posts: 34
My Ride: '02 Blk/Imola SMG M3
Post M3 Spark Plug Life?

I got my M3 with 80k on it and according to the previous owner, the plugs have not been changed. What is the typical mileage when there's benefit to replacement? I've checked and found no posts on this subject but know that plugs on 'newer' cars are typically intended to not need replacement for 100k miles. Maybe I just HAVE to mess with but I know how good fresh plugs feel in a nice engine and can improve mileage at the same time! I'm lucky to get 16 -18mpg in in town with some highway driving each week and think I can do at least a little better! I get about 24mpg at highway speeds of 75mph on a long highway run. This is calculated mileage not what the gauge says.
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