Husqvarna’s high octane fuel is mixed is a high-quality synthetic oil blend. Specifically formulated to provide the Husqvarna handheld owner with optimal equipment performance. The fuel does not degrade or oxidize like pump gas, and stays fresh for 2 years solving longer term storage needs. 50:1 ethanol free 95 octane fuel and oil mix. Mixed with Husqvarna’s synthetic oil blend.