Originally Posted by jeff1
Grease.. it can be used in one-way? maybe it will slip or not?
You are right.
Only the special purpose "one way bearing oil" must be used. The reason is that static electricity may appear by any other type of lubricants. Static electricity will cause the metal cylinders to go away from each other, meaning that they will all move to the outer ring of the bearing body, due to the electric forces and the one way bearing will not work.
Since I have not yet found such an oil from Kyosho, I use the Serpent one, which I recommend. Only 1 or 2 drops are enough, because more will have the same bad results like any other lubricant. I clean the 1st gear one way every 15 - 20 minutes of play and the front one way at the end of each racing day. I did not have any failure of those bearings for more than a whole racing season.