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If you want 50 to 1 ration, you need to figure out how many ounces are in each part. Divide 128 by 50 and you get 2.56. Therefore there â¦ are a quantity of 50 2.56 ounces in each gallon. If you only need one quantity for the oil, then you need 2.56 ounces of oil.aking the world better, one answer at a time. if you are using gallon container (for example) a gallon is 128oz. divide the number of ounces of the container by the ratio which is 32:1. so divide 32 into 128oz. the answer is how much oil in ounces is needed for 32:1. that's the way for all ratios.
Rating Newest Oldest. Best Answer: There's 128 ounces in one gallon, so divide the 128 by 40 and that will give you the number of ounces of two cycle oil you need for one gallon of gasoline. You would need 3.2 ounces of oil for the mix.My weed eater uses a 32:1 mix so I use 4 ounces of oil.my chainsaw calls for 50:1 (2.6 oz of oil)and I use the 32:1 in both without problems.ou would need 3.2 ounces of oil for the mix. My weed eater uses a 32:1 mix so I use 4 ounces of oil. my chainsaw calls for 50:1 (2.6 oz of oil)and I use the 32:1 in both without problems.