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A properly sealed electric motor requires no vent only cooling, in this case, it is probably not a good thing at all, in the long run, to have a vent since it will lead to a bit of fluid leakage which no one wants. But... If you can afford it you can test it with very good results, which is all...

In regards to geared hub motors, the idea is to close the air gaps with the stator core and the windings with the rotating stator shell and the motor housing. You really can't have the oil, not in contact with the gears. Just a little bit goes a long way when the motor is spinning, I have never...

True, Statorade is useless for geared motors since it sticks to the magnets so pouring it into a geared hub motor and hoping for the best would not be a good idea. However, both types of motors geared and DD have been successfully cooled using ATF fluid. Mid-drive motors have decent air cooling...

Yes, it can be done and it is quite effective using relatively small amounts of ATF low viscosity, or better yet ultra-low viscosity. The first geared hub motor I tried oil cooling on I used no more than 100ml which kept it below the axle. It is important not to use too much not just for...