My waste oil (and I have a lot of it), goes in 55 gallon drums and eventually in my Clean Burn waste oil furnace in the shop and I usually don't collect enough to keep it fueled all winter. My AF goes in a 15 gallon drum and it goes to Safety Kleen via my Kubota dealer to be recycled, what for I have no idea. I mix all the oil together, the Clean Burn isn't particular. Brake fluid too.
I take my waste oil to Auto Zone or O’riellys parts store and dump it in a big tank. NAPA stores don’t take waste oil. The guy at O’riellys said a truck comes when it is full and pumps it out. I do wonder what the waste oil is used for though. Another person posted mixing waste oil with honey and using it in a chainsaw, lol. Why would I want to do that to my chainsaw !!! On a related note, I make a 50/50 mix of automatic transmission fluid and acetone for breaking loose rusted nuts and bolts. It works great. The acetone causes the transmission fluid run down threads through the rust and corrosion. Works better than PB Blaster or WD 40.