I've found that the RB6 diff, with the stock Kyosho balls, really performs at it's best with the Xgear greases. No idea why but it does seem to make an impressive difference!
For what it is worth I was super happy with my Lazer diffs until I rebuilt them with the Xgear greases and new Kyosho carbide balls and now they are even better.
I've been running Kyosho cars since 2007 and as yet have never had any form of diff failure outside of normal wear and tear and the diffs tend to last 7-10 meetings before feeling like they could do with some love.
One tip is that some people still build their diffs by bottoming the spring out and then backing it off. I always build it loose and then tighten to just the point I can't get it to slip between finger and thumb with the outdrives held. I then fit it to the car, run it 2-3 minutes per side with the only one wheel on the ground @ about 25% throttle then the same on the opposite side.
Once that is done I then reset it by looking the diff screw and turning the other side wheel until it starts to feel a little resistance building and run it there. Recheck after a run or two but rarely does it need any adjustment.
Hope you work out what happened.
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