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    20W-50 used in a 120 mercruiser engine?

    Thanks a bunch,this really helped.
  2. D

    20W-50 used in a 120 mercruiser engine?

    My 1972 mercruiser inboard calls for 30 weight oil, couldn't find any at the store so purchased 20wx50 thinking this should work as I'm running this boat in Lake Superior I think the Cold water keeps it running cooler so the viscosity shouldn't get to 50 weight,although I don't know what...
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