I dump my old oil into the leftover containers for the new oil. If I dump it into say an old 7up 3L bottle even if I take the time to carefully rinse and dry it I think they get suspicious. I've been to some places that have a big barrel you have to dump your old oil into. I think these places tend to be service places or have service bays in conjunction w/ parts sales like say PepBoys(?). Other places you just leave your old oil bottles with them and I presume they deal with dumping it into a container or whatever. That's probably the most convenient for me. One place (Advanced auto parts?) wanted me to sign a book stating there was no water mixed in. Now I would think water to be the least of a recyclers worries. It's silly - afterall how would they ever know who brought what in? There appears to be no distinction between motor oil, gear oil or transmission fluid. I presume all are recycled together mutually? (and I guess you could lump PS fluid in there since it's largely an ATF or ATF variant) === What are your experiences with different places for taking your old oil into? What do they produce from recycled oil? Is it against the law to burn old oil? (no I don't do this - just curious - it's not uncommon in rural areas) What about anti-freeze or brake fluid?