I found a list on the internet saying all 1986+ BM's will run ok on E10 - however my previous car hated it, and my dad's cars both hated it (all 1986+ beamers). Mums old car, strangely, was just fine with it ('90 3 series).

If anyone out there has run an unmodified Z3 on E10, I'd like to know how you went!