larry moe 'n curly writes:

I have an unopened quart of NAPA #209500 mineral oil for old car air
conditioners that use Freon R-12. I can't find any information on it,
but is it OK to use in air tools?

It won't especially hurt them, but it is a little too viscous, and lacking
any plating or anti-corrosion additives that are good things to have in air
tool lubricant.