If I remover correctly, itís more a grease than an oil.
Somewhere thereís a document by a forum member
by the handle of ishipaco.
The gist of this document is that the gearbox
oil/grease should never really need to be changed.
I had a rebuild
kit with the unit I had. There were two tubes of grease, a small one of silicone for the o-rings, and a larger one of a normal axle looking variety for the gear