Ha ha, I don't know about actually, but he can turn into one. I think he's actually a dragon, though.

This form seems to suit him better.

[He glances down at Jeep: it's hard to tell what his mood is as a dragon, but it's much harder to be sure when he's a car. The dragon's head swivels around to glance at him in return, but Hakkai can't read his expression.]

Besides, it's much cuter!