StarTron is a unique multi-functional enzyme fuel additive that improves performance, cures ethanol fuel problems, stabilizes fuel & more. You'll feel the difference from the first time you use it! Treats up to 183L of gasoline.Safe for all gasoline engines - overdosing not harmful. Removes gum, carbon, and varnish; Cleans carbs, injectors, and valves. Stabilizes gasoline for up to 2 years. Disperses moisture throughout fuel as sub-micron sized particles that can be safely eliminated as engine operates. Helps prevent fuel phase separation.Usage instructions included in package.