I love how the first thing that comes up in the search is the old school maintenance document, the first line of which reads "Do Not Post This On The Internet".

Nothing wrong with following that maintenance schedule if one wants to, but if one wants to promote changing the oil twice as ofen as the manufacturer calls for, there should be some data that shows it actually helps something. Other than the bottom line of one's oil retailer.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue