If you buy a Quart of Amsoil 100 to 1 then you don't need to run it at full speed. It don't leak fuel or any of that. But it did carbon the ring up bad. And the manual don't tell you to run it at full speed, that is what he told me on the phone. But I run it at the speed I want now, with the Amsoil. Just a better oil, for the job. I would recomend it for any 2 stoke now, and no I don't work for them, fact is I don't work, too old for that now. But for a great string cutter, I love the Stihl, it has a lot of power, not too heavy, and cuts fast. You can have a problem with any of them, if you use them enough. I wore out the motor on the weedeater, and not that many hours on it. Not near as many as I'm putting on the Stihl. /forums/images/graemlins/smile.gif