Volvo is also doing pretty good with offering an official API
I was dealing with this 6 weeks ago!
But I hate to deal with car dealerships, they are the worse kind of salespeople out there, trying to sell you what they need to sell rather what you need to buy. You need to go there with a very, very well informed opinion about it. But then they will play the discounts card...
Even Google Maps is usable without an account.
If you want a real Volvo get an old one.