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At my shop we're starting to see the effects of 15,000 mile oil change intervals on US BMWs of the E and F chassis generation, this year so far we have replaced 3 N63 V8s and one S63 V8, all with spun rod bearings. All four had less than 80,000 miles on their engines and were not tuned or modified. It obviously doesn't happen to everybody but changing your oil a little earlier is extremely cheap preventative maintenance that might save you from a huge repair bill out of warranty.
My advice isn't to go crazy with changing the oil super often, most oils meeting the BMW specs will easily last 10,000 miles of normal street driving but 15,000+ is pushing it if you ask me. If you're tuned or drive the car hard and get the oil hot, you should change it sooner than somebody who is simply commuting in a stock car.
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