Are you selling used cars, or planning to build a car company of your own? We all have humble beginnings so let’s start from the most basic yet beautifully crafted themes made for automotive websites.
Automotive, for instance is a clean theme from Templatic. It has advanced features which lets you create your own car portal.
Radial is a premium WordPress theme from Theme Forest that features a glossy-look.
Automitive is a minimalist-styled theme that puts focus on functionality rather than design.
And many more.
Take a look at the theme showcase here: http://skyje.com/wordpress-themes-automotive-website/