Sorry my bad...
Yep, just keep up with the fluid removed..best I can remember it's about seven or eight quarts...So, get something that will hold that amount..I was able to find a clear/opaque five gallon container and marked it off with a Magic Marker in quart increments.
Now, on the external filter..The canister was a bear to get off..even bent the bracket holding the housing..but it did come off..watch for your O-ring..don't think you get a new one with your filter...Put a little fluid on it before install.
It would be my suggestion to fill the canister with new Mercon SP and gently lower the filter to absorb the fluid, adding more as needed. It is almost impossible to screw the canister back with the filter inside the canister..Just hold the canister under the housing and reach and get the filter and snap in on the plastic holding clips and then screw the canister on...a little messy, /ubbthreads/images/graemlins/smirk.gif but the only way I could get the thing put back together. Don't forget to keep up with how much fluid you used/removed from the filter.
Good luck..hope this helps ya /ubbthreads/images/graemlins/wink.gif