I am the proud new owner of a 99 lt. I bought her last week with 69k on her. I was bleeding the front breaks when I noticed that the top of the block was covered with a greasy gritty blend. It looks like years of fluid seepage mixed with road grime. The oily residue appears to be heavier on the head side of the block. I have not noticed any drips in the garage, so it must not be a full blown leak. Any thoughts on where to check?