Fuel stabilizer like some have said. Please never, never start it once or twice a month and let it idle for 5 minutes! Old wife's tale, you will take years off your engine. You are better to let it sit all winter. If you do start it, allow it to fully warm up for a while so the condensation will burn out of the oil. If you start it once a week for 5 minutes, condensation will build up in the oil and you will end up with rusted cam lobes and white, greasy junk under the valve covers.
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