www.nissan.com
ahhhh the power of a corporate car company. To make a long story short, Uzi Nissan is a jewish businessman who came to America before Nissan did. Every company he owned any part in got sued for damages him holding this url has caused. Keep in mind almost NO car company on this planet owns the domain associated with their companies name by a straight shot like that including Ford.
If you fight it, more power to you but they will attempt to run you over, the law is more on your side than they were with Mr. Uzi. Good luck if you fight it but maybe just milking it and then posting a link to a copy of your site not using BMW in any way will allow you to keep your customer base.