How should I store the snow blower when not in use for an extended period?
For storage of 30 days or longer, remove all fuel from the tank by running the engine until it stops, change the engine oil, and pour approximately 1 oz. of clean engine oil into the cylinder. Store in a clean, dry, well-ventilated area away from appliances with open flames. Never store with fuel in the tank in poorly ventilated areas. Keep the engine level and inflate tires to manufacturer's recommended pressure.
From the official Craftsman Cmxgbam1054541 Snow Blower manual, page 36
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