Came across this article on the hoops that lube mfrs have to jump thru to get BMW approval of their oil (BMW LL01 and BMW LL04). Don't think I've ever seen this explanation anywhere else.
http://www.top1oil.com/USA/newsletter/2011/July.pdf
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'14 328d, '13 M3 ZCP, '12 535i, '11 335d, '09 Z4 DINAN Stage II, '05 330i ZHP, '05 M3 ZCP, '02 M3, '91 328i, '90 535i, '88 528e, '88 M5, '87 M6, '95 Z3, 95 M3, '93 M5, '87 325e, '89 535i, '86 635i, '73 Bavaria.