MotorKote MK-FO16-06 Fuel Optimizer, 16-Ounce, Single Directions: Add about 1 ounce per 10 gallon of gasoline or Diesel fuel at least every 3rd to 4th fill-up on most passenger vehicles; larger engines use same amount every fill-up Motorkote fuel optimizer is safe for use in all catalytic converters, emissions systems and diesel particulate filter Cleans fuel system and is a great storage solution for winterizing tanks and equipment Fights gelling and waxing adds horsepower and torque Cleans injectors to reduce: loss of power, hesitations, pinging/dieseling, loss of fuel economy