>You can double clutch while upshifting or downshifting.
>
>With cars today there is no point in double clutching unless
>your synchros have gone bad. That's why you have synchros, so
>you don't have to double clutch. And there is no point in
>saving wear on the synchros, since for normal driving and with
>proper tranny maintenance synchros should last quite a long
>time.
>
>So, unless you are driving a 1950s packard or studebaker, or
>you lost a synchro, don't worry about it.

A Mercedes mechanic of at least 20 years experience told me this exact same thing. Double clutching is only with cars that have bad or no synchros.