I was crawling abound under my "new to me" 2001 Duramax Chevy 4x4 and I found what looks like epoxy on the crankcase in front of the oil pan . It is in the area where the tie rod sits. It covers the entire area and looks to be 1/4" thick. I am guessing this is not supposed to be there, but if someone could tell me that it is I would feel MUCH better. If I was a betting man i would say that a previous owner cracked the case and used a liquid steel to patch it. On the plus side my oil pressure is good. Any help would be great.