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With my first new 2002 330 I used to let the dealer do the oil based on the 18k CPU intervals.
After warranty expired I waited for CPU to prompt oil change after about 16k. I changed it myself an was shocked at how watery and thin the old oil was. After this I changed the oil religiously every 7k.
On my 07 335i I have changed the oil every 6k on average - with as hot as these engines get I don not want have old crap circulating in there. Recently changed my valve cover and the tech that helped me commented on how nice and clean the inside are, can tell I change it often because at the dealership the cars have some sludge and buildup when the covers are taken off.
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2007 E92 335i MT
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