STIHL MotoMix® is our patented premixed fuel, specially blended for ultimate performance. This 50:1 mixture is a combination of premium non-ethanol, high-octane motor fuel and our highest-quality STIHL HP Ultra Oil. Plus, we stand behind this formulation by doubling the limited warranty when you include MotoMix® with your power tool purchase. It’s no surprise that MotoMix® is the official fuel of the STIHL TIMBERSPORTS® Series.