Oil Mix for ’57 Merc Mark 25

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  • wabittle


    Replies: 2
    Topics: 4
    #271923

    Hello. I have a 1957 Mercury Mark 25 and I am wondering what the best oil mix is for this motor. I have been running it at 32 to 1 using Quicksilver oil and non-ethanol gas. I have a 1962 shop manual that states it can be operated at 50:1 using Quicksilver oil. What is the current accepted oil ratio given modern gas and oil? Thanks.


    fastjohn

    US Member - 2 Years
    Replies: 147
    Topics: 42
    #271927

    Even though you can run it at 50-1, I run all my Mercs at 40-1.  32-1 is a little rich but will not hurt it.

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