DFL Diesel Fuel Lubricant Tank ShotSame DFL as in the 1L and 4L but in a convenient and handy package. Includes extension spouts to facilitate easy pouring into all diesel tanks. No measuring, one can per tank fill. Notice immediate results in Duramax, Powerstroke, and Cummins light duty engines. No more half bottles of nasty smelling additives rolling around in your truck. Diesel fuel conditioner. Contains CETANE BOOST. (2 Ethylhexyl nitrate). Add DFL to diesel fuel at the 1: 500