I've got no experiences with Cobalt, but can you de-tune it so it does not rank well for your dealerships name?? Can you remove or modify your name on the site so all that is left are it's franchise content?
Absolutely.
URL's: Most of the CoBalt URL's are
http://dealershipname/miscpage5 or
http://dealershipname/VehicleSearchResults?search=blahblahblah so you don't have anything going for you there but your domain.
Title & meta tags: Waaaaay over-stuffed with absolutely no strategy whatsoever. The default CoBalt settings for filling these areas don't know whether they want to own a dealership name, a car model, an OEM brand name, or a region. Pick one! They're trying to be too much and that's why they'll only rank on a little.
Content: this is dealer editable for the most part now. However, many of the OEM-dictated sites have a ton of flash in them. I assume the OEM's are just as mesmerized by "pretty" as most dealer principles are. "Pretty" can be done along with conversion, speed, and strategy. I look at some of this stuff and it is obvious they're applying newspaper strategies to a website

- big flashy ads. Get a clue folks - it is your website, you're only competing for the customer's attention with yourself. You don't need all this crap. .....my tangent for the day.
Links: CoBalt has no linking strategy that I've ever seen. Maybe it is a special package you have to buy, but it has never been offered to me. Our VW CoBalt site has been around for about 5 years and has 60 links pointing to it. Our VW Dealer.com site has been around for 3 years and has 781 links pointing to it according to Yahoo. Not to mention the other 10,000+ links that point at our Dealer.com group site.
Just on those 4 items alone, a CoBalt OEM-mandated website could never be strong enough to make anykind of dent in a more progressive SEO campaign without considerable outside help. But the limitations of the platform in itself would still hold it back from full potential. Yes, it ranks well for your dealership name, but I can get that same result in 3 hours of setting up a Wordpress site and then giving it a little link-love later in the week. I just see this juicy domain that CoBalt is using for our VW site and I want it to do my own thing. And because I'm so limited by the CoBalt platform and OEM restrictions I want to put that stuff as far away from my Google results as possible.