Air con compressors ARE oiled in their standard role and the oil level is important - as the compressors are running for long periods and pumping up to 300psi around the aircon system. For short periods and depending on the type of compressor you may get away with none. HOWEVER, if it were my truck I'd be inclined to oil the incoming air then install an oil seperator afterwards.
We have a (garage) oiled compressor which we use for spraying. It is fitted with an oil spearator and the air we get is DRY.
You could then have a valve to switch from dry air to oiled air for the tools. A regulator may also not be a bad idea - aircon is quite a bit too high a presure for airtools.
Marko
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