Star Brite 14408 Diesel Additive (6/8Oz) Helps increase fuel economy, Stabilizes diesel fuel for up to 2 years Makes engines start easier, run smoother, Reduces soot and all emissions Lowers fuel system maintenance, Rejuvenates old fuel 1 fl. oz. treats 16 gallons of diesel, cannot be overdosed Eliminates carbon build-up in fuel delivery system and on exhaust components