Dura Lube Upper Cylinder Lubricant: * Cleans injectors to reduce loss of fuel economy * Cleans upper cylinder walls * Cleans and lubricates carburetors, injectors and valve seats * Reduces carbon build up * Safe for use in all vehicles including gasoline, flex fuel and diesel * 100 percent compatible for all vehicles including GM and GMC * 5.25 fl oz bottle treats 25 gallons of fuel * For best use, use every fill-up for best results and performance