The Oil to Gas Ratio for a Weedeater

Oil

• Before mixing your ratio, you must learn which type of gasoline and oil to buy. Weedeater requires a 2-cycle engine oil. It's the type of fuel many air-cooled engines use. You should be able to find it in the auto section of most major stores.

Gasoline

• To complete the Weedeater fuel mix, 87 octane gas—what most consumers refer to as “regular”—will suffice. Adding a higher octane gas will not improve the performance of the device, so don't spend the extra money. Before buying the gasoline, check the label and ensure that it contains no more than 10 percent alcohol or ethanol. If the gasoline you choose contains any alcohol, don’t let the fuel sit in the Weedeater for more than 30 days. If you leave too much fuel in the tank, and you don’t plan to use the Weedeater anytime soon, run the engine until the fuel tank runs dry.

Ratio

• According to Weedeater's official website, the ratio of gasoline to oil is 40-to-1. This means that you add 3.2 ounces of 2-cycle oil for every gallon of gas that you add to the Weedeater tank. Remember not to leave this fuel in the Weedeater for more than 30 days.

Filling the Weedeater

• Because the Weedeater lacks separate reservoir tanks for the oil and gasoline, the two solutions must be mixed together before they're poured into the Weedeater. Pour your 40-to-1 ratio of gasoline to oil into a gas can that has a spout. Close the can completely, and then stir the contents for a few minutes until the solutions are completely mixed. Label this gas can "Weedeater Mix" so that you don't fill it with regular gasoline.