Avoid BMW 850i at any cost. Trust me, I've owned one. I had a silver 1991 850i. I bought it used back in 1994, when the car had only 33,000 miles. I regularly serviced that POS at BMW dealer. But still, things started to fall apart when the car reach 50,000 miles. The rear window motor was death, $700. The motors for both front electric seat were burned. They have two motors on each, and each cost about $700, and that's almost $3,000 for them. And the list went on: The wiper's motors, The Air Cond, the Water pump prematurely failed, etc. I thought my car was a lemon, but I talked with two friends that I met later that also owned them, and theirs were also piece of S#!& cars. One guy told me that he suddenly lost power on the freeway, and it turned out that 6 of his 12 cylinders failed to work, it just died. The repair? A cool $16,000.
Do yourself a favor and avoid BMW AKA BMtroubleU