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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).
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