Full ceramic bearings can be used without any oil. But using them outside, it must be severe environment such as water, dust, debris,,,
So we would like customers to use the full ceramic bearings as long as possible.
Ceramic bearing coating by a special oil can be used longer than without oil also less than its friction. We have asked it to one of the largest chemical manufacturers to make as our request. This is the CDJ special oil only for ceramic bearings.

15ml glass bottle with nozzle