A few months ago we got a CPO 2006 E350. The dealer had put 4 new Continental tires on it. The car had a vibration which was diagnosed as a bad tire; it was replaced. The vibration was reduced but still remained. We took the car back a couple of days ago and another tire was bad. My wife picked it up today and a 3rd tire had gone bad. I have no reason to believe that the tires are anything but junk.
Note: By bad I mean that using a road force balance machine the tires check our ok one day and not the next (with corresponding vibration).
Has anyone heard of a bad run of Continental tires a few months ago?