Adding oil to it will allow the tub to move during agitate. Allowing less then optimum wash performance. It could also pose a danger to the consumer, When opening the lid, the tub could still be spinning because the brake is slipping. The correct answer is to, either one, leave it alone, it won't hurt anything. Or two, go buy a brake tool, Remove the stator, and replace both the stator and rotor. I have also heard that some will sand down the stator. I don't know if that works, as I have never done that. One thing I would never do is take a short cut of slapping some oil into the brake.