Re: Mark 25 fuel oil mix

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August 18, 2017 at 9:29 pm #63382
David Stanton
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    According to the Old Outboard Handbook, Mercurys from 1956 to 1962 get 6 ounces of oil per gallon, which is 21 to 1, and double that for racing. In 1963 Mercury went up to 50 to 1.

    Dave