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  • Gear oil

    I have a 1973 50hp outboard been trying to find the right viscosity for the gear oil. Want to use royal purples gear oil

  • #2
    90 weight..........

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    • #3
      So 75w-90?

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      • #4
        The 1973 50hp Evinrude/Johnson does not incorporate a oil pump in its lower unit and as such requires the HiVis gearlube which states it is 90 weight. It says nothing about 75 weight.

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