What Goetic spirit have people used for getting a new car? I can’t figure out which one that’s associated with personal transportation.
You could look for one that helps you get any new item and not just transportation. I don’t know any my self though.
I would go with Marquise Shax, “will procure horses at the exorcist command.”
That’s a bit general, you mean to buy a new car? You need to get the money for a new car? If yes then you should focus on a Spirit that will help you get more money like Bune for example.
If you want a Spirit associated with transportation, my proposition isn’t a Goetian but you could always ask Hermes/Mercury.