Got a 2013 pro rmk. Just got the engine rebuilt about 200 miles ago. Anyways in the bottom of the bulkhead is like a thin oily black oil I guess, doesn’t smell like gas. I have looked closer and it looks to becoming from the bottom of the exhaust valve mold where it seals to the engine with a gasket or the exhaust gasket by the Y pipe connects to the engine. What you guys think? I really don’t want to rebuild the motor again.