Ok normally i would say TM issue, but in Germany where BMWs are produced, there are a LOT of HUGE Forums with the name BMW in them. Active since many many years and i am sure BMW knows about them. Like:
http://www.bmw-syndikat.de/bmwsyndikatforum/
http://www.bmw-forum.de/
There are 3 possibilites,
- either BMW doesn't care
- or BMW likes them and sees them as a free type of advertising
- or the people behind these websites contacted BMW and got a permission for noncommercial fan sites / forums (the most likely possibility)
There are also a lot of forums, with the Name of the Model only excluding "BMW" in the Domain, like :
http://www.e90-forum.de/
http://www.e46-forum.de/
http://www.1erforum.de/
These are probably safer than those with "BMW" included in their domain.
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Anyway, about these Domains: they are 0$ Domains, not only because of possible TM issue, but because these are concept cars, aren't they?
If you are going to set up a forum and ask BMW for permission ok, but if you want quick bucks , then forget it, TM issue and not sellable.
For your case, (wanting an appraisal , a price, be very carefull with BMW :
http://www.wipo.int/amc/en/domains/search/fulltext_decisions.jsp?q=bmw