STA-BIL Fuel Stabilizer is America's top selling fuel stabilizer. Stored fuel can go bad in as little as 30-60 days, causing gum, varnish and corrosion to build up in the fuel lines and engine. STA-BIL is recommended to be used at every fill up in all vehicles and equipment to protect against corrosion caused by today's ethanol-blended fuels. It keeps stored fuel fresh for quick, easy starts year round. For optimal results, treat fuel as soon as it is purchased.  STA-BIL Fuel Stabilizer, 32 oz:1 oz. treats 2.5 gallonsFor extended storage (up to 2 years) use double the recommended dosageDoes not contain alcoholMay be used for up to 2 years after opening bottle