Biodegradable Bar and Chain Oil. Use this product instead of petroleum based products. BCO is priced less than petroleum based competitors and safe for the environment. Specify if using in cold weather when ordering. It is good practice to drain BCO from chainsaw and replace with petroleum based lubricant for long term storage. Always wipe clean dirt and oil from chain and blade after every use. Available in 8 oz, 1 quart, 1 gallon, 5 gallon, 55 gallon drum and 250 galon ibc tote.