For bars over 42″ or that need extra lubrication. Oil is injected in to the groove at the working end of the saw bar. Flow is controlled by a valve on the tank and oil is delivered by gravity. The Auxiliary Oiler Kit will extend saw bar life, provides for cooler cutting and prevents early bar wear. For non double end bars, two holes must be drilled in saw bar tip. Newer saws with better oiling systems may not require additional lubrication.