I usually turn steel, but recently I've found myself turning boatloads of aluminum now that I'm doing runs of parts. I use straight Kerosene in a spray bottle, decently slick, doesn't stink, dries in a day or so, leaves a corrosive inhibiting film behind and is cheap. For difficult low-heat tasks like threading I use used motor oil, I'll use it more when I figure out a lathe fume extractor and filter. For used motor oil I use an eagle oiler, not a 66 but close. A paddle trigger not a button, and a flared base.