Gasoline can go stale in as little as 30 days. When this happens, the fuel oxidizes which can clog engine components leading to poor engine starting, inconsistent performance, or even engine failure. In addition, ethanol-blended fuels like E10 can lead to rust or corrosion within your engine if the fuel is not treated with a fuel stabilizer. This video summarizes the importance of using a fuel stabilizer, and how often to do so.