Are you sure? It could be unburnt gas and water from the exhaust. How would water get in the lower unit? Can you see the seal leaking. Fish line? Is it milky? If it's milky oil, that means there is oil and water in the lower unit. Check it out, you might just be getting lucky! I hope.

Boston Whaler, "MUMBLER", 24' Outrage, twin 175 HP Evinrude Ocean Pros.

Snowball, the cat...