Gallon. Treats: 4,096 Gallon. Makes engines start easier, run smoother. Disperses bacteria without the use of poisons/biocides. Reduces all emissions, including carcinogenic, particulate smoke – eliminate diesel soot. Stabilizes diesel fuel for up two years. Eliminates carbon build-up from burners, injectors and exhaust components. 1 fl. oz. treats 32 gallons of diesel fuel.