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      10-11-2011, 11:51 PM   #207
Private First Class

Drives: 2008 M3 6MT + some other stuff
Join Date: Sep 2010
Location: Bay Area, CA

iTrader: (1)

Great thread.

This is my 5th M car, and I have always changed the oil every 5K (synthetic). As I am coming up on the mid-service change at 7,500 on my E90, I am curious if anyone has sent their oil in for analysis at 7,500 and 15,000, and what if any difference there has been.

PS. With 3 kids, a wife, dog and work, I have not been able to fit in a track day on this car, so if anyone has done this analysis on a spirited street driving vehicle I would be very curious what the different results are at 7,500 Vs 15,000 without track action (in which event I have always changed oil much more frequently).