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I change the oil in my 4-cycle engines usually twice a season. Once during the middle of summer (around this time I guess) and once at the end of the season. Every now and again, I'll just do it once a season, but always after the last mow of the season, so that used oil doesn't sit in the crankcase and oxidize all winter.

I always keep the engines stored over the winter full of fuel. In my experience, even when using fuel stabilizer, trying to run them out of gas lets varnish build up. I keep the tanks full, and the fuel shutoff closed, and haven't had problems with startup in the spring. Our off season isn't all that long, though. Maybe November through March.
 

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I change the oil in my 4 cycle equipment twice a season. And the air filter every season and the spark plugs every 2 seasons.

I always run my machines out of gas at the end of every season. I haven't had a carb problem since running my machines out of gas at the end of the season.
 

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Thank goodness for Lawn Boys! No oil to change, just run em out of gas and let them sit thru the winter. Sharpen blade, mix fuel and away you go!
 
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