My experience is that nail guns and staplers get the recommended few drops of oil before using or evey few hundred nails. I would not/do not put oil down any air hose. I have had 3 kinds of air hose (I haven’t used rubber), the PU hoses get brittle and break after a few years
the other 2 are for main supply and feed to tools
So far I have only had one failure of the orange ones and that was where a stop was clamped around it.
I have dust and extremely fine ceramic and nylon filters on the lines. I use pressure control mostly on the spray guns but do have a pressure control on one of the filters