Bought the wifey a lil ford escort wagon back in the eighties.. a 'dealer demo' with 1,200 miles on it. Had an upgraded non-ford stereo in it. A week after I picked it up the stero died.. sounded like a nuke hit the radio station.. squealing waves of static.
Took it back to the dealer, they told me it was not a ford part, and was not covered under the warranty. Annoyed to beat the band, I told 'em to change the oil and filter. Then drove around the corner and took the drain plug out and ran it till the engine smoked.. about 6 miles. Called 'em up, had it towed in and a new engine put in it... all under warranty.
When I went in to pick it up I kindly inquired as to the status on the stereo.. "is it changed yet?" When they said 'no' I politely asked if they'd like to change engines in the damn thing every week. They replaced the stereo.