I seem to remember a discussion about the need to oil the motor bearings every 6th flight.
I was on the phone with 3DR about another subject and when finished I said "oh by the way"
blah, blah, need to Lube? and the answer was yes, I will send you the directions.
I did not receive the information as of 2 weeks later.
How often to do oil the bearings?
with what oil?
Decades ago I built anemometers for a research project and calibrated them in a wind tunnel. I found that
it was better to run the bearings dry as it did not collect dirt as well. The bearings were very lightly loaded
so it seemed to work. It seems to me that when I fly and apply vigorous attitude adjustments the bearings are sufficiently loaded to require Lubrication.
Can I get a witness?
How about, how often and the technique.