I have only had warranty repair and maintenance done at Cooper in OKC on my 2004 4.4i sport. I do have some complaints, but think they can manage an oil change.

On the other hand, my warranty runs out in June so I am shopping for an extended warranty. There was a Yahoo group or something like that for OKC BMW owners and I once asked about a BMW friendly shop and most told me to stick with Cooper. But those in the group lacked the expertise one finds in this forum.