.......adding oil...
With the plug out of the cone, look into the hole. You should fill it up till your at the bottom of those threads.
I don't remember exactly how much it holds, I just researched and posted that the other day for another M-2 member, but can't remember. But that was from bone dry. See, you should never go bone dry unless you remove the bearings and clean out the stator. So, to ask if 6 oz. is enough, isn't really a good question. I can't tell you that. You just need to fill it the way I described.
Also, if you had that oil come out or could see it. I hope you looked to see if it had yellow coloring.....that would be an indicator that your seal has been compromised.