If the engine was never getting warmed up completely, often evidenced by a buildup of condensate paste under the oil filler cap, then I would be changing it more often. We make the occasional short trip, 5 km for groceries once per week, but alternate trips are 30 minutes plus, and the vehicle gets highway trips (Okanagan, Calgary) regularly. We stopped using the car for all work commutes and daily errands two years ago, as we now live two blocks from the Skytrain (subway) line.
If the car was being put in storage for any length of time and not being driven, I would have fresh oil in it when I parked it.
Srmmmm, some interesting engines there. Not any that I would extend an oil change interval on, though  . I work with a Tier 1 automotive supplier as well, managing engineering product development through PPAP, and service support after delivery.
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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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