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Since I've never owned a BMW that is under warranty, no comment/experience w/Dealer inspection prior to warranty expiration.
Oil change interval - BMW uses Conditioned Based Maintenance, so things like the oil change interval are calculated by the car's electronics that take input from car's sensors. The car's computer calculates and alerts you at the time an oil change is to be done, it's based on your driving style. Shorter trips, more frequent stop/start, etc. = shorter change interval. More extended/highway driving = longer interval.
On my 2012 X3 (I have 6 cyl motor) I generally change oil/filter at 7-9K miles. There are as many opinions of oil change intervals as there are car owners - nothing set in stone.
I did pull an oil sample on my car and had it analyzed, see below. The analysis is basically looking at the amount of metal particles the engine 'sheds' into the oil - so this is a way to get an approximation as to the oil change interval and engines condition.
Good luck/Bill
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