If it were mine. I would take her to the river and keep the injection bottle full of Quicksilver and it should live (as mercury intended it to) for 30 years!!! Good luck. Your in good hands with the old merc.
couldn't agree more. 20 year old merc 150, not one oil related problem, actually not one problem with the engine period. Love my Merc.
I'm not knocking any other oils just always used Quicksilver.