I pulled the oil pan an a recently acquired 81 R100 to check out the inside of the engine. I'm ready to reassemble and the manuals (Clymer and Haynes) say to use sealant on the gasket but the original gasket came off dry. Also, the prior owner replaced the push tube seals and the ones on the right side sealed fine but the left side both leak pretty bad. I can tell the seals look newer, can they be tapped in to be tightened up or do I need to pull that side an replace them? What do the experts say??