Free sticky rings to improve performance, reduce fuel consumption, restore power and extend engine life.Star Brite's Star Tron Ring Clean PLUS is formulated with the latest in deposit control compounds. It also contains a proprietary enzyme package designed to remove existing deposits and help prevent the formation of new deposits. Improves fuel combustibility to keep engines clean and operating at peak performance levels. Ideal for removing deposits caused by ethanol-blended fuel. Use every time fuel is added to keep engines in optimal condition. Works in all gasoline engines; not for use in diesel engines.