Id love to know how the cracked wheels dont fall into warranty if the car is in its 3 year threshold. At the Merc dealers where I work, if the diamond cut wheel finish is coroding they dont even bat an eyelid at replacing it under warranty, never mind a crack in the wheel!

Have to say though, tyre prices where I am aint the best, but sometimes its just more convienient whilst having the rest of the work done.