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How to Make 50:1 Oil

by Robert Bayly

Two-stroke engines use a special oil in the gasoline to lubricate the piston, crankshaft, and flywheel assembly. Some engines have a separate oil tank and a metering system that automatically mixes the correct amount of oil and gasoline. Other engines use "premix," in which the oil and gas are mixed together prior to being put in the gas tank. Different engines use different ratios of gasoline to oil, ranging from 20 parts gasoline to 1 part oil, or "20:1," up to "50:1" or more. A few taps on a calculator will give you this information.

Enter the amount of gasoline you want to mix into a calculator. As an example, we will use 1 gallon. To make things easier, convert the gallon to ounces, which is 128 oz. per gallon.

Divide 128 (oz.) by 50 to get the amount of oil you need to add to the gasoline. The number 128 divided by 50 equals 2.56. You will need to add 2.56 oz. of oil to 1 gallon of gasoline to get a 50:1 ratio.

Pour 2.56 oz. of two-stroke oil into your gas can. Add 1 gallon of gasoline. Put the lid on the can and agitate the gasoline to thoroughly mix the oil and gas together.

Tip

  • If this is for a motorcycle or other two-stroke engine with a gas tank larger than 1 gallon, you may want to premix 5 gallons. This would be 5 times 2.56, or 12.8 oz. of oil.

Items you will need

About the Author

Robert Bayly, based in Apple Valley, California, began writing in 2010, his "how to" articles can be found on eHow. With more than 15 years in the auto industry, Bayly has been an auto and diesel mechanic, service writer and parts manager. He received certificates from Pontiac (parts system), Cat Diesel (engine service), Saab and Fiat (parts- warranty system).

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