Depends on the private seller.
was there a guarantee or was it sold as is?
After a car sale, a private party can return the car within thirty days. This return policy is dependent on the individual seller.
No.... The time to check a car out is before you buy. Unless otherwise agreed to a purchase from a private seller is typically AS IS so buyer beware.
In a used car yard or private seller, or a car collector
you can for a private seller but if you buy multiple car's and lease them it would be illegal unless you have a dealer license.
no, the car could b stolen
online, car dealership or a private seller!
Any private seller would save you the sales tax
yes, you always pay taxes...no matter what.