What oil do you put in 4 cycle weed wacker?

4 cycle oil also known as 4 stroke oil.

Reason: 4 cycle oil is not meant to be mixed with gasoline as the weedwacker has 2 separate lines for fuel and lubricant.

Conversely 2 cycle weed wackers require 2 cycle engine oil to be mixed at a ratio of 40:1 with the gasoline.