I repack ours with valvoline bearing grease about every 2 hrs of run time. I’ve not found a silicone oil thick enough to stay in the diff. We run everything between a 19.5 brushless and a castle 4600. The output shaft sleeves wear quickly and are difficult to seal even with the full metal version.
 
I'll second that. The differential is not sealed. The bearing grease suggestion is a good one.
 

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