OK, thanks for the input!
I had some bike chain grease laying arround, it's a spray with HPL PTEE that can be used for "all" that needs grease and has a temp range from -50 to 250 degrees It thin, but vaporises quickly and then leaves a film of grease.
For now it's working, so I let my blower run for 2 days, see if the problem is solved.
There is now also grease inside the copper windings of teh motor, and on the magnet..... I hope that does not matter....
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If it get's hot, it needs to be watercooled!
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