I had about 60 qts building up and was sondering what to do. check for a recycling center. i was headed to walmart since the 5 qt just they sell tell you to bring it back but i stopped at the county dump and the woman said they have a tank for oil.. i went around back and they let me dump it into the tank that they use for the county's road dept trucks' oil. I have also taken it to AZ and depending on who is working, they just tell me to take it in the back and dump it. just go in looking for something, and if there is a girl working there, just say hey can i dump this used oil---the other guy said it was ok. they shouldn't care after all i think they SELL the used oil to companies that try to clean it up and use in waste oil heaters or something. if you can siphon off any oil or into a new container, do that and the sludge, just dispose of in the trash. or consolidate all of the water/sludge into one container, and when nobody is looking, dump it in the oil recycling tank....they can;t complain when you are trying to be responsible and not dumping it on the ground.