Eskimo Viper 2-Cycle Engine Oil Ice Fishing Auger Accessory -Viper semi-synthetic, smokeless, 2-cycle engine oil with fuel stabilizer is specifically blended for Viper engines. It’s safer for the environment and the equipment operator because it helps eliminates exhaust smoke. Viper oil maintains a clean fuel system and removes the need for draining fuel at the end of the season. Use in 2-stroke air-cooled engines 50:1