Umm, that's why I'm asking before I do anything. Was that not clear?
I have every intention to take care of this tool, because yeah, it was
friggin' expensive. I wanted to know if someone happens knows if IR oil
is really a specific oil that must absolutely be used, or if it's just
something common with "IR" printed on the bottle. As I mentioned, I
have no information on the oil itself in order to find out on my own.
Not to be offensive or anything, but I'm not an idiot. "No, that
won't work, you need the real stuff," is plenty to let me know that I
should use the specified oil. The whole lecture thing--twice in a row,
no less--is redundant, a waste of everyone's time, and pretty annoying
to boot.

I doubt that it is anything special although they may have requested
an additive of some kind to make it "special". Most air tool oils (for
the motor) are just a good quality lightweight oil. When I had an air
tool repair company we had the best luck with TriFlow. Often we would
send a tool back to the customer and after a few days of continuous
use with no lube the customer would return it for a warranty repair
when all it needed was a little oil. After we switched to TriFlow they
would run a couple of weeks and someone would usually snap to the idea
that they might need to lubricate it. I was never a big fan of ATF.
Good luck and enjoy your new toy.