I would not recommend that you attempt to lubricate them in any way.
I definitely agree!! Wouldn´t make sense anyway: the gear is plastic as i remember.
It could be less noisier by running much slower . . . but i guess that´s not what
you would like really . . .
In the slowest mode you can´t hear it at all - but you also can hardly see it moving at all . . .
takes hours for one 360 turn
You can try to glue damping mats onto the inside of the body´s plastic parts - battery compartment and vertical arm -
but i doubt it would really help much.