I have a 2011 E92 M3. On a hard right turn when the car is cold (like pulling out of my driveway in the morning), there is a LOUD grinding noise that comes from the right side of the rear end. At first I thought it was the tires rubbing. Driving it around in a couple right hand circles clears up the issue. I'm told it's a matter of lubricating the clutches in the rear end. Had the special high lubricity additive put in at 1200 miles. Hasn't helped. There is no problem when the car is warm (as the fluid heats up and is less viscous, I imagine). Very embarrasing to have a $70k+ car at work and when I pull out it like an old clunker, not to mention what it's like when I show someone the car for the first time and it does this! Been to the dealer once and no help. Going to a different dealer next week. Anyone else have a similar problem or heard of it in others?