No, the two have the same engine but the M6 weights about 500kg lighter. But that only matters in a straight line. In a corner, the M5 is simply too long to have a good turning feel.
Typically dealerships charge 75 to 100% more for parts than parts stores. Parts can also be ordered online. As long as the part is correct for your vehicle you will see little or no difference in...
DEFINITELY NOT!!!!!!!! you don't need anything from the dealer. of course you are free to spend as much money as you want there, but there's no difference. or even if there is, it's not bad for your...