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everything gets sta-bil all season.. and run out of fuel when the season is over..the oil should be changed at the end of the season.. reason being... the acids in unburned gasses in the crank case can corrode the aluminum block and put pits in the crank shaft and connectiong rods... most of those engines are not sleeved bearings and have little tolerance for wear of low grade oil..
a shot of mystery oil( or fogging agent ) in the spark plug hole and a slow pull to distribute it is not a bad idea either..
sears is pretty good with their power products.... they replaced two pumps on my pressure waher.. in the first two season I owned it... no questions.. no cost to me..
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