Am I in overkill?
When I was in Junior High School I worked afternoons and Saturdays in a typewriter repair shop. They kind of looked at it as, "If you don't drain the air compressor every night, you are looking for a shorter life span."
I did work in a couple typewriter (office machine) repair shops after the big bombs and before they let me out of the service. Both shops demanded the compressor be drained every night.
Because of the above, I drain my air compressor tank every day that I use it. AND I hate doing it!!!
Enjoy,
Jim