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I add sta-bil every time I get gas. I leave what is left in the mower and have not had a problem. The small engine place I get my stuff from did tell me to change the oil at the end of the year so that the dirty oil doesn't get a chance to let the particles settle to the bottom over the winter as it can form a sludge. I guess it is a good point, why leave dirty oil in there all winter.....
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