Rear main leak? Hope it’s the valve cover though. My valve cover leaked at the same place down bottom. At the dealer back in 1995-1998 they had us reseal the valve cover with rtv if the customer wouldn’t spring for a $100-200 cover which was a replacement item just like valve cover gaskets... ridiculous. I tried to get the seal out and then rtv a new bead but no bueno. It’s in to stay. I even used a die grinder but it just gummed up.