I've used MTL in two BMWs, and no worries. The E39 has had MTL for 50k, and one change between. So far, so good.
The Toyota experience seemed to have been a result of some plastic parts inside the trans as I recall.
Ed in San Jose '97 540i 6 speed aspensilber over aubergine leather. Build date 3/97. Golden Gate Chapter BMW CCA Nr 62319.