When looking for an answer on an item or problem I usually try to go to the source - the manufacturer. And if I can't find it on the web, I simply call them and talk to an engineer. After all, they usually know best.

http://www.bearing.co.il/OILITE.pdf
https://www.bowman.co.uk/bearings/oilite-bearings-self-lubricating-bearings

And there are others found by Googling.

Greg