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Back in the the BMW tech training days we were told the oil service interval is triggerd by the liters of fuel used and then the computer use a formula to turn the indicator into miles. You could have almost no miles on the car and still trigger a service.
So far I have done 2 oil services myself after the break-in period since the car have spent most of its time on the dyno at GIAC. A couple of days on the dyno is the same as a day at the track.
Oil analysis on previous N54 engine cars using Total synthetic oil yield one of the best change intervals of 4K miles, which included 4 track days and the rest is daily driving and getting to and from the track. With no track days I have seen intervals of about 7.5K miles.
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