[DNSB]

Not quite right. The First Sale Doctrine allows for library lending, video rentals, selling or giving away, etc. There are quite a few court cases that have allowed all those activities. It's even been used to cover grey market imports (for instance, a couple of cases have allowed textbooks printed in other countries by an American publisher to be imported and sold without infringing on the copyright).

You do have to have ownership before the First Sale Doctrine comes into effect. You can not rent, borrow, lease, whatever.

Using your example, if I purchase a car, I have the right to rent it out, etc. If the warranty specifically excludes such activities, I would not be covered for warranty purposes though given the number of transferable warranties, it might make for an interesting case. I do know that locally leasing a car gives you coverage under the warranty. This courtesy of one manufacturer which attempted to revoke the warranty on leased vehicles and lost in court.