The Star brite 93100 Star-Tron Diesel Enzyme Fuel Treatment is a 1-gallon product designed for all diesel engines requiring fuel system cleaning and stabilization. Its enzyme technology breaks down water and sludge, removes gum and varnish deposits, and stabilizes fuel for up to two years. This treatment facilitates easy engine starts and smooth running by reducing carbon build-up on burners, injectors, and exhaust components, while transforming water into submicron-sized droplets for safe elimination during engine operation. It is suitable for everyday use, seasonal storage, and can rejuvenate old, sub-spec fuel, with overdosing posing no harm. Add 1 fluid ounce for every 4 gallons of gas or diesel fuel, allowing it to sit in the tank for a minimum of 24 hours before using rejuvenated fuel.