We added to the original MARVEL Mystery® oil to create a specially formulated tool oil for use in all piston type and rotary air tools, as well as in-line air lubricators. MARVEL® air tool oil prevents rust formation in air tools while providing positive lubrication for smoother starting, longer lasting tools. MARVEL® air tool oil assures the maximum performance of your tools by dissolving gum and sludge that reduce tools speed and power.