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The formula is ((gallons of gas x 128) / mix ratio) or ((4 x 128) / 40). The true answer is 12.8 ounces for you, but if you were to put 13 ounces of oil in because measuring tenths of an ounce is hard to do, it would be okay.
Wiki User
∙ 10y ago
Wiki User
∙ 15y agoThe 1979 model, 90 hp Mercury outboard requires a 50:1 fuel , to 2 cycle oil ratio. This is roughly one pint of 2 cycle oil, to six gallons of fuel.
Wiki User
∙ 15y agoi would put a safe bet on a 50 : 1 mix
Wiki User
∙ 11y ago50 to 1
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