However, they are also scoped to domains, so if there was some non-car business with such a name, they would also be entitled to the name, and the domains tend to be first-come first-serve in those kinds of cases.
Think of all the "Acme" or "A-1" companies that all have different products, and the general public doesn't have an issue conflating them.
(not a lawyer; not legal advice)
The offending use does not have to be a 1:1 match to dilute.
(not a lawyer; not legal advice)