I had an MKV VW Gti and that requirement was every 10,000 miles. I followed the manual and changed every 10,000 miles for well over 100,000 miles of hard driving and I had no issues. I would think technology has advanced since then and BMW's 15,000 miles sounds fine to me and I will stick to what BMW recommends.
Also you will end up at the dealer 1 or 2 times before the 15,000 miles anyway depending on how you drive to add a quart of oil.
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