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How would OE oil change intervals have anything to do with valve stem seals? Are the valve guides trashed (meaning it isn't a valve seal problem) or are the rings shot? Both of those are at least related to lubrication. But given the number of vehicles exhibiting valve seal issues, both seem unlikely.
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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
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