I have a 1994 S600 Coupe that has been professionally serviced several times for the same problem. This problem has been particularly hard to diagnose by my mechanic and I am about to give up on the car completely. He has fixed absolutely every leak he can find. But when the car is parked, without being started or driven for a couple of weeks, the car dumps large amounts of red fluid (enough to coat the garage floor from drivers side to passenger side). It looks like it is coming from the back of the transmission, the power steering pump and associated components have been replaced, and I am starting to suspect tranmsission cooling lines, but wanted to see if anyone has had any actual experience with a similar problem. Incidentally, if the car is driven regularly, it does not leak anything at all. Many Thanks! Ryan