I have a 1985 8hp Johnson. I recently replaced the water pump on it. After test running it and making sure everything works fine, I noticed that my outboard is leaking oil from the exhaust. I am positive it is not gearcase oil because it is not a dark gray color but more like used motor oil. It is not leaking a lot just enough to make a puddle the size of a half dollar over the course of a day or so. It never leaked like that before. I am thinking maybe I ruined bushing or a gasket when putting it back together, and the oil is running down the driveshaft from the engine. Does that sound logical or did I do something else wrong or is this nothing to worry about. Anyones expertise would be of great use to me. Thank you.