Much has been said about oil usage in M103 engines. In my case, it appears to be coming from around the camshaft seal. While picking up some parts at my local MB dealership last weekend, I was told this is all too common on these engines. The parts counter employee indicated that a special tool was required to drive in the new cam seal. Do I REALLY need a special tool to replace an M103 cam seal? Are there any other special tools required? Thanks for your time.