There is no mystery - silicone oil is the only lubricant for drones and quadcopters. Will not react with rubber o-rings or plastics because silicon oil is free of mineral oils. NEVER use cheap mineral oils.
Racing Drone Quadcopter Brushless Motor Grip Pliers - 13XX to 23XX - UK STOCK
Racing Drone Quadcopter 2204 2205 2206 Motor Guard with Landing Gear - UK STOCK
Drone with Camera 1080P for Kids and Adults, Foldable Drone with Brushless Motor RC Quadcopter, Toys for Boys and Men Birthday Gifts (Grey)
Brushless Motor for Drone for FPV Drone Quadcopter Easy to Install Replacement
Brushless Motor for Drone Replace Lightweight for FPV Drone Quadcopter
Enhanced Efficiency Brushless Motor For FPV Quadcopter Racing
