None specific.
I don't believe in a lot of hype regarding this.
Frequent inspection/PM is the key here.
Any thin oil should do fine.
There's even debate about the bearings being sealed and so oiling is futile.
But if you're going to use a solvent based cleaner, as many are, then you should look into the need to re-lube.
I have not yet had to do this on my Phantom motors but have on other similar BLDC outrunner motors in CP helis.