This is for Volvo Penta owners that change their own gear lube. It might also be for owners that have their gear lube changed at a shop but it always seems to leak/weep some "oil" into the water.
Maybe this is a no-brainer, but make sure you get a Volvo spec rubber O-ring to go back in that little groove around the drain plug. The OEM part from Volvo is a similar size but much thinner than a typical rubber ring, and I don't think you're likely to find a proper substitute in the trays at your local hardware store.
My local marine shop uses/sells a part that is not quite right. It loo