I would recommend Labelle 108 oil (which is plastic friendly) as some oils will not be kind to plastic !
108 comes with a needle applicator in the pack.
There is no such thing as a 'sealed bearing' for brushless motors and even T-Motor recommend lightly lubricating the bearings every few flights.
My T-Motor MN3508-20 580's on my hex have a rated bearing life of around 60 hours (which can be pushed a bit further as long as you keep a close eye on them). They still need lubricating and I put a drop of Labelle 108 on the top and bottom bearing about once every 15 flights. I use the same stuff on my heli's and (touch wood) I have NEVER lost a bearing due to catastrophic failure.
There will be posters here that probably pop up and say "Oh the bearings are sealed for life and should never be touched" etc etc but if the manufacturer of the motors/bearings advices lubrication then why argue?
You can even go to the trouble of using a solvent to completely clean/de-grease the bearings and then oil them up again but these tiny units are so cheap you may as well replace the whole set of bearings every 60 hours or so.
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