Hello; I don't know where you got the idea that WD40 is oil. I use a quality air tool oil, which canbe bought at any automotive parts place. Air tool oil is formulated to coat and protect as well as lubricate, this is what is wanted here, not water exclusion or a penetrating oil. I have a 8 oz. squeeze bottle that I have had for years, the nozzle fits the vent line of my 4 strokes (no two strokes) and even after long storage (years) my engines are protected.