This is a 2 part series from Oklahoma State University of Watchmaking on the correct use of Oilers.
Oiling a movement correctly is one of the most important skills you need to master, and these videos give some excellent advice.
Part 1
https://www.youtube.com/watch?v=eMJiX0MA-Wg
Part 2
https://www.youtube.com/watch?v=rlMW5qMHaNc