AV RovAir compressor lube?

[ba49]

  I just bought a Air Venturi RovAir compressor from PA and didn't see anything in the manual about if I have to add lube before using it and if so what type? There has to be something lubing it I would think. I can't find anything on line about adding lube or changing lube either. Does anyone out there know? Seems like a nice unit.

[Back_Roads]

 Appears to be a oil free or maintenance free unit, I imagine one could tear it down and lube when doing maintenance.
https://www.pyramydair.com/airgun-resources/manuals/RovAir-air-compressor-manual.pdf

[ba49]

  Thanks James that's what I thought but I wanted to make sure. I have the large AV 4500 and change the oil every 20 hours and have had 3 years of trouble free service.