Keith Hughes writes:

You are confusing heat and temperature, because compressing air does
not generate heat.

Nonsense. The "compression of air", i.e. the volume change alone,
does not change heat content(enthalpy), however mechanically
"compressing air" always does.

I correctly responded to a misstatement of your "does not". Your
"always" is irrelevant.

I'd just as soon not breath contaminated oil vapor.

Then you better not cook over a stove or grill.

Hardly the same context given the dilutional differences.

So you must agree. Some oil is OK. How much? And what shred of
evidence do you have that a shop compressor exceeds that?

Mineral oil is not toxic in itself.

In the gut, no. In the lungs, yes.

Aspiration hazards are not toxicity hazards. By your logic, water is
toxic since too much of it in your lungs will kill you.

You are breathing oil-contaminated air all the time, over a cooking
stove or around 2-cycle engines. No one thinks much of it, because
it isn't a hazard.

And in most of those situations, you're getting particulates, not
volatilized oil.

So you must think a particulate oil fog is OK when a vapor isn't? That
cooking or running a 2-cycle or fogging for bugs isn't generating a lot
of oil vapor? Come on.

Using an oil sealed compressor to supply breathing air is just stupid,
unless you care nothing for your health.

Calling something a hazard when you have absolutely no data on the
levels, and where the oil consumption suggests negligible levels, and no
standards for permissible exposure, is what is ... I don't want to say
"stupid", but let's call it California style environmentalism.

OSHA PEL for mineral oil mist is 5 mg per cubic meter. Show that this
is exceeded in shop air at the delivery point. Don't just timidly
speculate.