I built mine with the included lube in my x-pro and it went really notchy really quickly. When I rebuilt it I used B fast diff lubes and it has been fine since (saying that though it does have the b-fast balls and plates to so thats not probably a great comparison) . The kit stuff seems very runny compared to most diff lubes I have used before.
Saying that though I built both of my Xpro4 diffs with the standard stuff and they seem fine so far. Maybe the stuff I got with my x-pro wasn't quite right.
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