I experienced no issues when starting up my laid-up motors (motorcycles, lawn mower, generator, string trimmer) after winterizing them with this product. In a few months ethanol in untreated gasoline will phase separate (ethanol attracts water and the water forms a separate bottom layer). Water and varnish caused by ethanol will deteriorate metal and plastic in fuel systems, especially in older equipment not engineered with ethanol in mind. So in addition to getting less energy content in our gasoline due to ethanol addition, gasoline must be treated with a stabilizer to prevent damage in long-term storage. This is a good stabilizer.