Star Tron Enzyme Fuel Treatment - Super Concentrated Diesel Formula Makes engines start easily and run smoothly; improves economy and reduces emissions and carbon build-up from burners, injectors and exhaust components For everyday use and seasonal storage; stabilizes fuel for up to 2 years and can help rejuvenate old, sub-spec fuel Disperses water throughout fuel as submicron-sized droplets that are safely eliminated while the engine operates Cleans valves and injectors of carbon deposits, gums and varnish for maximum performance, increased fuel efficiency and reduced emissions Super Concentrated Diesel Formula 931XX is economical to use in large applications; safe for use in all engines and fuels, including heating oil