What is 2-cycle engine oil?

Two cycle engine oil is made to be mixed with gasoline. This mixture may range from 1 part oil to 20 parts gas (1/30) to 1/50. Its usually written on the gas cap of the 2 cycle engine. This oil is the only lubrication a 2 cycle engine receives, so it is very important. NEVER run a 2 cycle engine on straight gas because permanent engine damage will occur.