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Go to your nearest stihl specialist dealer
Depends on the Model of stihl trimmer you have. The 45 home trimmer from stihl takes .080 but from that model to the larger more expensive ones the string size gets larger.
a dealer that sells stihl or maybe online
China
0.020"
Certain models of Stihl grass trimmers are designed to run on gasoline and can be used with up to a 10% (E10) blend of ethanol in the gasoline/engine oil mix, although it is important not to exceed this limit.
shema motora
50 TO 189 octane
To lubricate the shaft of a Stihl FS-46 trimmer, apply Reynolds lubricant to the shaft. Rotate the shaft and pull the converging wedge between the shaft and the bearing.
The best electric string trimmer based on the consumer report is the Stihl FSE 60. They say it can handle as tough of weeds as any gas trimmer but you do have to contend with the chord. For a 2 stroke string trimmer, the best one is Echo SRM-225. It is light and tough on weeds.
Some manuals can be found at the link below. A trimmer has an FS designation, but many manuals with A BG, FC or HS designation will do. The two most common engines in recent years have been the 4137 and 4140 engine families so watch for those numbers. If you have one of the newer 4-Mix engines, that is the 4180 engine and it would be the one that starts FC 90 and has FS 90, 100 and 110 in the list. If you have the old 4120 engine that Ryobi built, it is not there. See link below: this is the only place I know of with any service manuals for Stihl!
approx 93cc engine