When added to gasoline: Cleans and lubricates fuel injectors and carburetorsImproves gas mileageReduces and prevents varnish and gum build-upExtends spark plug lifeSafe for catalytic converters and oxygen sensorsWhen added to engine oil: Prevents valve sticking and clatterFortifies properties of engine oil, prevents breakdown caused by extreme temperaturesPromotes easier cold weather startsReduces and prevents sludge and acid formationFor all marine engines- inboard and outboard