SUN JOE Saw Joe Bar, Chain Sprocket Oil (model SJW-OIL) is the cutting edge in the high-performance bar and chain oil, reducing friction, prolonging the service life of bars, chains, and sprockets as well as resisting oil thrown off at high chain operating speeds. Prevents rust, resists high temperatures, and flows freely at low temperatures for reliable, all-season performance. Not suitable for internal engine use.