Damnit. Was away on business and my wife called about the X5. Strange noise from the engine. Turned out to be a broken idler pulley bolt! Apparantly theres been a recall on this in the states, four years ago, but as always not in Europe because we cant sue and win billions over a spilled cup of coffee.. not very likely that it has something to do with the dynamic drive issue, unless it broke due to a bad tandem/servo pump. Belt looks fine.