See, the problem here is that the Volkswagen company is very litigious. Most corporations are lawsuit-happy, but VW is particularly so. They might sue you even if their case is horribly weak, and a trademark lawsuit could cost you tens of thousands of dollars. Therefore, it might not be worth the risk.
However, that said, if you do the following things, you would probably be able to win a UDRP, your case would be very very strong:
a) make sure that you don't claim or lead visitors into thinking your site is endorsed by or representing the actual Volkswagen company. Furthermore, a prominent disclaimer stating your site is not official, would be a good idea.
b) make sure you don't sell any Volkswagen products, or make any money in any form from the site. Have no advertisements, etc.
If you do these things, I tend to doubt that VW would bother you. After all, your site would be a fan site that helps their brand by increasing its recognition. So...in closing, if you want to be perfectly safe, forget your fan site or change the domain. If you want to be reasonably safe, just follow my steps above.
