What is the correct fuel mixture for a Stihl chainsaw?

All gas-powered Stihl equipment runs on a 50:1 mixture of gasoline and two-cycle engine oil, according to the manufacturer's website. Stihl recommends the use of gasoline with no higher than 10 percent ethanol content.

All two-cycle engines run on a mixture of gasoline and engine oil. For handheld equipment, the proper mixture ratio can range from 32:1 to 50:1, depending on the manufacturer and age of the equipment. Stihl specifies a mixture ratio of 50:1 and advises users to check their product manual for specific information regarding fuel mixes. To prepare one gallon of 50:1 mixed gasoline, combine 1 gallon of gasoline with 2.6 fluid ounces of two-cycle engine oil.