I've had the same issue on mine since I got it (it was brand new RTR) after about 2 meetings the diff would be almost empty. I rebuilt in many times as per the guide & tried using some silicon grease as suggested to Support @ TD but didnt help much.
I got some new brand new replacement X-Rings, which did help quite a bit but still leaks a little, although no-where near as much. I could feel the difference in the tightness straight away so it's clear that where the issue was.
I would suggest giving the O-Ring a try, thats what I'll be doing.
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