Sorry to hear your engine is down. Old boats have problems, hope you get the engine running again. I have to replace the rudder tube on my 1979 Ericson 25+ which should be to much fun.
Milkshake oil problem has been fixed! Motor is back to healthy shape. Was a bad water pump seal allowing freshwater into the engine crankcase. Decided to bypass the old water pump and installed two electric pumps instead.