Agree.
When selling a car, I also ready type up, and print 2 copies of a receipt for payment for the vehicle.
It goes along the lines of-
Receipt for payment of car x
Registration x
This vehicle is "sold as seen" and comes with no warranty or guarantee.
I get them to sign both and keep one myself.
It did come in handy one time when about 2 weeks after a sale, a buyer returned to my house to inform me one of the door handles had stopped working and would I be prepared to do anything about it.
I reminded them the car was "sold as seen" and comes with no warranty or guarantee, showed them the receipt they had signed, and I never saw them again after that.