my compressor (a makita) doesnt seem to use oil. I ran mine on the OE oil for a little while for some projects, filled some air tanks, etc., and then changed it out. Ive been using Amsoil compressor oil in the right viscosity and it operates noticably cooler. This may have been because of the break-in period, or perhaps it is the fluid.
Id change it once then not worry about it, dependign upon use and duty.
I built a special air filter mount for mine. The factory one was just a little sponge. Now it uses a cylindrical paper filter with a sponge surround. Presumably the primary reason for wear on these is dirt in the oil. Better filtration should help.
I change the oil once every two years or so. That probably amounts to a 60 hour OCI at most now that my Bronco restoration project is done.
Mine has never used any oil.