Stihl MotoMix® is our patented premixed fuel, specially blended for ultimate performance. Like a sports drink for your engine, this 501 mixture is a combination of premium non-ethanol, high-octane motor fuel and our highest quality Stihl HP ultra oil. Clean and convenient, MotoMix® eliminates the hassle of mixing your own two stroke engine fuel while providing great performance and lubrication. Plus, we stand behind this formulation by doubling the limited warranty when you include MotoMix® with your power tool purchase. Stihl MotoMix® contains no ethanol, allowing it to maintain stability for up to two years after the seal is broken, so it stays fresh in your equipment during long storage periods. It's no surprise that MotoMix® is the official fuel of the Stihl TIMBERSPORTS® Series.