limited warranty

[pbaby22]

I purchased a used car at a local dealership. During the contract signing, I also signed a limited lifetime power-train warranty. The salesman, at the time, didn't know that I had signed one. I was talking to him about it and and told him how it gave me peace of mind, it being a used car and all. I left the dealership and about 3 hours later he called and said that the warranty wasn't any good. It is a signed document by the finance manager. Can they rescind this warranty?
Thanks for any advice.

 

[disagreeable]

Most of those warranties are useless third party warranties and specifically exclude certain vehicles or types of vehicles with certain equipment. Would you prefer to pay for a warranty that by its terms is invalid?