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I have a 1960 Evinrude Fisherman 5.5 HP motor that I'm in the midst of changing the gearcase oil. I was at Gander Outdoors and discovered I had a choice of 80w90 or 90w. Which one is best suited to my engine, if any?
BTW, when draining the old oil, it came out brown. Is this normal? The reason...
