for somthing like a line trimmer or blower just use any old oil. it doesnt really matter. use 10w30 or tcw3 or whatever.
little 2stroke engines will run forever and a half on any kind of oil.
i think you guys are too picky about things.
i can understand wanting a good 2stroke oil for a dirtbike, pwc, outboard, or some high end chainsaw. but for simple little $150 string trimmer or blower, using a GOOD oil is a waste of money. i used klotz in my dirtbike, but i wouldnt waste my money putting it in my blower or string trimmer.
what is more important, is to properly tune your engine. adjust the low and high speed needles for proper air to fuel ratio for whatever gas and oil you use. i have a green machine string trimmer thats probably older than i am, and it runs great to this day using whatever oil i had sitting around, even used car motor oil. it uses a zenoah g32 engine, which is specked at 32:1 oil mix. do ya think i care? i just dump a bit of oil in the gallon gas can, dont even bother to measure it. if i had to guess id say i average about 50:1 mix for the thing.
my point is that it just doesnt matter. little 2strokes dont require good oil, they dont require good gas either.
proper tuning of the carb is what keeps your engine internals cleanly, and keeps your exhaust from plugging up. just about every single small 2stroke is set way to rich from the factory, and as the air filter plugs up, it gets even worse.
thats as simple as it needs to be , a little carborator tweak once in a while and your off and running for another month.