The key to maintaining your shredder at optimal performance is proper oiling. Dahle shredder oil is the only lubricant you should use in your paper shredder. It is specially formulated so it won't leave any residue that could attract dust and clog the shredding mechanism. The procedure for lubricating your shredder is simple. Apply a fine stream of oil from one side of the feed opening to the other. Then run the shredder in reverse for a few seconds to help distribute the lubricant evenly. The frequency a shredder needs to be oiled will vary. A Strip Cut shredder being used 1-2 hours per day will need lubrication weekly. A Cross Cut shredder should be lubricated after every hour of use. Dahle Shredder Oil is available in a case of (6) 12oz. bottles, or (4) 1 gallon bottles.