Originally Posted by SenorFunkyPants
Fair comment...I should have been clearer and said not to be recommended for the M3 diff as it might not be suitable.
Certainly the diff on my M3 is noisy taking sharp turns when cold but its fine when warm and so I don't intend to take any action.
I don't intend to take any action on the M3 either, and I didn't take any action when it occurred in my C6 Z06 . It is normal.