Star Tron Diesel Formula makes engines start easier and run smoothly with improved fuel economy and reduced soot and other emissions. It will stabilize diesel fuel for up to 2 years. Works in all types and sizes of diesel engines. Additive lowers fuel system maintenance and eliminates carbon buildup in fuel delivery system and on exhaust components. Rejuvenates old fuel. 1 fl. oz. treats 16 gallons of diesel.