I've never tried buying a car with a credit card (though my credit limits are, insanely, high enough that I could). I would guess it might be seen as a cash ad

I've never tried buying a car with a credit card (though my credit limits are, insanely, high enough that I could). I would guess it might be seen as a cash advance and charged interest immediately, also not accrue into the loyalty rewards. But I don't really know.