I havn't been able to find any specs on toner in any manuals so I wouldnt reccomend trying to buy toner in bulk. There are just too many variable's in toner.
Canon has mono-component toner, most have dual-component, some are negative charged, some are positive charged. Also, toner has a specific melting point matched to the speed and temp of the fuserin the copier.
Asking a service tech, please don't add anything but the manufacturere's or katun's equivalent toner.
