What kind of oil is After Run Oil?  What oil could I buy in larger quantities to use for "after run oil"?

    I have used various brand air-tool oils for a long time - Sta-Lube and Marvel Air Tool oil (not Marvel Mystery Oil). But. to be honest, lots of times I just don't bother, and have had zero issues with rust or gumming up over the years.

        Brett

I presume ATF stands for automatic Transmission Fluid.

Thanks for these helpful responses.  I don't use after run oil much but there is a fellow modeler who thinks I ought to.  I had two small after run bottles but seem to have misplaced them.  Then, while thinking about that, I opened a box that had a quart of ATF oil in.  I may just use that the after run oil I have ordered doesn't come.