I have a 2001 V92C and just drained the oil. When I bought it there has been an oil leak. It looks like it's coming from the drain plug. There is a copper crush washer on the plug, but the flat part of the drain that sits against the engine looks like it has a recess for a rubber o-ring instead of a copper gasket. Has anyone run into that? Should I get a new copper gasket or put a rubber o-ring? I am in Ct and it's pouring and will be pouring for a few days so I have time to get what I need before nice weather gets back.