Just picked up a 84 Mariner 40 HP Outboard along with a jon. Engine runs good but when I put it in the water I noticed an oily substance and after parking it in my garage there was a puddle of blue oil which looks to be coming from the exhaust ports maybe? Not real sure but I added a photo below. I have searched and read several things on google but I don't know if this is the same thing I am seeing. I'm guessing I'll have to pull the lower and possibly replace a few O rings. I should mention the oil is not milky at all. Thanks for the help in advance.