hello all I've just bought my first merc. It's a 220 ce '93. There's a lot of crusty oil behind the pulleys on the front of the engine which looks like it's been there for some time. The engine pan underneath is also fairly covered in old crusty oil. looks like there is a slow leak from something and I'm hoping it's not the head gasket! any ideas? If it is a slow leak from the HG can you tighten the bolts slightly to seal it up again? Is it likely to get worse or should I not worry too much? thanks!