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It is the ratio of ounces (oz) of gasoline to ounces of 2-cycle (motor) oil in a mixture used for 2-cycle (or 2-stroke) engines. Different engines require different mixture ratios--some are 50-1, some 32-1 and so on. To calculate the amount of oil to use, you need to simply divide the quantity of gas by desired mix ratio. 1 gal of gas is 128 oz. So, for a 32:1 ratio 128/32 = 4 oz oil. For 50:1 ratio 128/50 = 2.56 oz oil. Be sure to use 2-cycle oil!

Mike

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16y ago

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