It's for the mentally disengaged. No need to mix oil.. Someone will put in straight fuel. (Murphy's law). You should mix fuel as you use it and shake both the Oil container and the mix. As a purist I favour mixing it MYSELF then I KNOW where I'm at. These days all but the most basic things have OIL PUMPS. but remember straight fuel can wash off oil. 50:1 is also a bit dry especially, for a cold motor. and you may have to enrichen the mixture a bit if you go to premix. Lean mixtures are not tolerated well by 2 strokes. Nev