coolant coming from between the head and block
 

On the 96 E300D, I've noticed water/coolant(whitish when it dries) coming down the rear of the engine(not a lot) and have traced it to where it looks like its coming from between the rear of the cylinder head and block. Is that possible or am I missing something or is the gasket shot? the car has 115,000 and doesn't seem to run hot.
Matt
P.S. I've also posted this in the diesel discussion