How do you calculate gas oil mixtures?


Quick Answer

The amount of gas available for mixing determines the calculated amount of oil required. Consult the manual for the manufacturer's preferred gas-to-oil ratio for its equipment. Convert the gas from gallons into ounces, since two-cycle oil is calibrated in ounces. Divide the ounces of gas by the manufacturer's gas-to-oil ratio, and round off the result to the nearest half or whole number.

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Full Answer

Most tools, recreational and transportation machinery with two-cycle engines have gas-to-oil ratios ranging from 20:1 to 80:1. For a new two-stroke engine, there is a break-in period where a ratio that is double the normal is required. For example, in the case of a gas-to-oil ratio of 60:1, a ratio of 30:1 is required during the break-in period. This means that more oil is needed during the initial period of operation.

Experts advise that it is better to err towards excess oil rather than not having enough. Rideau-info.com provides gas-to-oil fuel mix charts that serve as an ideal reference for any two-cycle engine. During the process of mixing, it is advised to blend a gallon of gas with oil at a time to impede settling in the gas can and raising the chances of engine and carburettor deposits.

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