If it is electric no, petrol powered ones normally do as they would use a "2-stroke" mixture.
Look on the Gas cap of your weedeater. It should tell you the gas to oil ratio. If its not there try looking in the manual or online.
ow do you reload a stihl weedeater need answer ASAP
Turn counterclockwise.
2 cycle
40to1
Sae 30w
50:1
Mower engines use 30Wt
50:1 Stihl HP Ultra oil
Almost all lawn mowers require SAE 30 oil.
All Stihl products use a 50:1 mixture
Generally 30W of SF or higher rating