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® Fuel Stabilizer keeps fuel fresh for up to 12 months during storage, eliminating the need to drain fuel. Ensures quick, easy starts after storage. Effective in all gasoline, including Ethanol blends.