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The introduction of reformulated gasoline has left many people wondering whether there is cause for concern over its use in their small engines. Actually, yes and no. Using fresh, reformulated gas has no bearing on engine performance. However, reformulated gas that has been sitting unused for 30-40 days or longer is cause for concern. This old gas can cause symptoms such as surging, hard starting, diminished power, etc.
We suggest running the gas out of any equipment that will be sitting unused for an extended period of time. Reformulated gasoline that has been sitting for longer than a month should be disposed of. The use of fuel stabilizers may prevent varnishing in the fuel system, but it will not prolong its useful life.
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