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A 1982 model, 15 hp Johnson outboard, requires 3 ounces of 2 cycle oil, per gallon of fuel.
6 ounces
The 1987 model, 50 hp Mercury outboard requires a 50:1 ratio, mix one pint of 2 cycle oil, to six gallons of fuel, or 3 ounces of oil per gallon of fuel.
The 1998 model, 5 hp Mariner outboard requires a 50:1 ratio, three ounces of 2 cycle oil, to one gallon of fuel.
Since there are 128 ounces in a gallon, to get a 25:1 mix using 1 gallon of gas means you need 128/25 = 5.12 ounces of oil.
2 cycle oil. mix 2.6 ounces per gallon of gas
A 40:1 ratio would work out to 3-3.5 oz. of 2 cycle oil, to one gallon of fuel.
It depends on the mixing ratio of gasoline / oil for the specific piece of equipment you will use the gas / oil mix. Most lawn equipment such as weed eaters and leaf blowers require a 32:1 mixture. Since 1 gallon of gasoline is 128 ounces, it is necessary to mix 128 ounces (or 1 US gallon) of gasoline to 4 ounces of 2 cycle oil to equal 32:1 ratio.
There is 128 oz in a liquid gallon so to achieve a 40 to 1 ratio you would add approximately 3.2 oz of 2 cycle oil to one gallon of gasoline.
A 40:1 ratio would work out to 3-3.5 oz. of 2 cycle oil, to one gallon of fuel.
A 115hp Mercury outboard boat motor has a fuel to oil ratio of 50 to 1. This translates to 16 ounces of 2-cycle oil to every 6 gallons of fuel.
It requires that you mix 4 ounces of 2 cycle oil with one gallon of unleaded fuel to create a 32 to 1 ratio. Make sure you use 2 cycle oil and not regular oil. Also make sure you use the correct octane fuel. Lots of 2 cycle engines require at least 89 octane fuel. Check your owner's manual.