You should have a valve and bleed system of some kind you can use to isolate the CO2 bottle rather than leave a pressurized tank on the gun. These companies can help you. Check there web sites. The only lube you should use in a CO2 gun is Crosman pellgun oil. Put a drop on the end of the CO2 cartridge once in a while or a couple drops in the cartridge tube. Most people over lube airguns. If you ever repaired airguns it is not uncommon to find oil running out when you disassemble them. Break free and firearm oils will desolve the seals in an airgun. Firearms do not have rubber seals like an airgun and the lubes are not compatable.
http://www.mac1airgun.com/
http://members.cox.net/co2une/maxzbulk.htm
http://www.cooper-t.com/index.html