oil, lube, coolant...

[Desolus]

You will like Anchor Lube. It is my go-to cutting fluid when drilling large holes in steel, and just about any size hole in stainless. The rest of the time I use a mist coolant from Rustlick, applying it through a no-fog spray mister that I built myself. If taking heavy cuts in aluminum I resort to WD40 out of a spray bottle.

400 from National is essentially wd40, but with a serious detergent added. It will melt tar right off of anything, assuming it doesn't melt the anything. Not safe around plastics... not for use on bearings with plastic bits. Learned that the hard way...