The dealer shill thus spake:
the local dealer may have overpriced their product so you buy elsewhere, but that local dealer is still obligated to do the warranty service (for which they are paid quite well by the manufacturers).
In no other industry is this true. In electronics, white goods, etc, there are "certified warranty service centers" where you can call up and get them to fix your stuff. For example, you don't have to go to an Apple dealer to get your high-priced computer fixed under warranty - you can bring it or ship it to one of many service centers.
Please note that the requirement to become a service center does not include having to be an Apple reseller.
Ford, Volkswagen, Jaguar, Chevrolet, etc., should be able to certify garages for warranty work. But no, the automobile industry is the only industry where you have to go to a dealer to get warranty work done.
Leeches, all of you. Die already.