schaffers or vp @ 40-1 neither smell bad, smoke or have carbon/ash buildup issues. I Like both, schaffers is blue and vp is red when mixed making it easy to distinguish once mixed. The stihl in the orange bottle isent half bad, makes decent power but smokes/stinks. vp is the cheapest and is easy to find but the schaffers definitely has the thinnest viscosity in cold temps so I save it for winter.