i got a messed-up BCG 3.8 motor and i was just going to throw it away, but the people who responded to my thread suggested using a lubricant. well i found some silicone lubricant and used it and the motor and gears ran faster than they did right out of the box. now my motor works like a 4.2. it has crazy torque, the wheels spin from a standing start about 20 times! im glad i used it. now i am faster than ever!