If you have a leak at the reduction box (behind the torque driver) you either have a failing seal(s), missing screw and/or cracked cover. Find the leak and fix it. As far as oil in there most scooters call for 80-90 Hypoid oil. I use Honda brand. On modded Zuma 2-strokes I use 10-30 synthetic motor oil.
The amount should be cast into the case, usually around 110cc.
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