Re-re manual:
Totally surprised Kyosho shows to do so on a 2016 re-release model... possibly to get that Optima nostalgia feeling 🤣. And yes, I also use some "dry" stuff barrowed from my MTBikin' days (Pedro's Extra Dry Lube) on CVA joints.
No grease. Even if I would get the hardened steel spur gear for my eBuggy... no grease would be used.
The only time I greased a spur, and pinion gear was when the instruction manual said to do it. '83 Frog...yes. '85 Optima... sort of, kind of did (on the "counter gear"/gear behind spur...