The Oil Mix Ratio for a Stihl FS55R Trimmer

The Stihl FS55R is a lightweight, string trimmer for cutting grass and weeds down and along yard edges. This 10.6-pound machine may be equipped either with nylon trimming or a metal trimming blade. Its fuel tank retains 11.2 fluid ounces, which equals one-third of a liter. The 1.66-cubic-inch engine demands a 50:1 mixture of gasoline to oil, based on Stihl.

Fuel Mix

To make fuel to the FS55R string trimmer, combine 2.6 U.S. fluid ounces of high quality, two-cycle, air-cooled motor oil in 1 U.S. gallon of midgrade unleaded gasoline. Shake well before persuading. The gas should get an octane rating of at least 89, with more than 10 percent ethanol.

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