To keep your brushless motor operating at maximum performance, it is important that the bearings in your motor be properly maintained. In an average flight, the motor in a 450 size helicopter spins around almost a quarter million times! Without proper lubrication, the balls in the bearings can wear out quickly, leading to premature failure. The oil included in the kit is a special product that actually bonds to the metal parts, and resists being thrown out by the high speed and centrifugal forces. A small drop placed on each bearing about once every 10 flights is enough to maintain proper lubrication.