Even though my drivers side mirror vibrates just slightly I was at the dealership and both tires on the left side were checked for balance. They were close to perfect but adjusted the weight accordingly. While the tech was doing this, I drove a demo which happened to have a black mirror with the chrome kit like mine, in the event we could swap. The demo drivers side mirror vibrarted much, much worse than mine. Maybe they all do it to a degree, I don't know.