I unscrewed all 18 bolts of the oil pan on my 92 mits mirage 121k miles. the **** thing won't come off. I tried breaking the seal with a flat screwdriver, a knife, even wrapped both of my hands around it and pulled a hard as I could and my 190 lbbody was dragged forward. I used a hammer to tap it on each end..nothing...this gasket is the original 12 year old pan gasket. there's so much black sludge from it, it's nasty. do I just need a block of wood, a hammer, and go to town with it? is there anything else I can do?