Star Tron Enzyme Fuel Treatment - Concentrated Formula 32 oz - Treats 512 Gallons Cures and prevents ethanol fuel problems; helps prevent phase separation For everyday use and seasonal storage; stabilizes fuel for up to 2 years and can help rejuvenate old, sub-spec fuel Makes engines start easily and run smoothly; improves fuel economy and reduces emissions Cleans valves and injectors of carbon deposits, gums and varnish for maximum performance, increased fuel efficiency and reduced emissions Concentrated formula #930XX is economical to use in large and small applications; safe for use in all engines (including 2-cycle pre-mix)