I have a 1977 70hp Evinrude OB and I use the 16oz bottle of Evinrude oil to 6 gallons of gas. That equals out to about 48:1 and go on and replace all the rubber hoses.
Best of luck,

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I have a 1977 70hp Evinrude OB and I use the 16oz bottle of Evinrude oil to 6 gallons of gas. That equals out to about 48:1 and go on and replace all the rubber hoses.
Best of luck,
