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990558 (1004) - Simplicity Sno-Away 4HP 21" Single-Stage Snowthrower
Check your owner's manual for the proper gas-to-oil mixture. For almost all modern two-stroke engines, a 50-to-1 mixture is recommended. This leaner mixture is possible due to improvements in the quality of modern mix oil. That requires about 2 1/2 oz. of oil for every gallon of gasoline.