I usually take them to O'Reilly's. They take my used oil AND filters. But, this occurred to me. The nearest landfill has been in use well beyond thirty years. In the 80s there was no place to take used oil. In fact, after reading the "take used oil to a collection center" text on an oil container, I called the local EPA office (this was around 1985). The official I spoke with advised putting oil in an old milk jug and tossing it in the trash. So, at the lower levels of the landfill sit a whole bunch of used oil and filters because I'll bet more people changed their own oil back then. And, OCIs were quite a bit shorter than they are now. I'm not encouraging putting this stuff in the trash. I'm just saying that lots of that stuff is buried closer to ground water than anything we would throw away today. Given low curbside recycling participation rates I'll bet a lot of used oil still ends up in landfills. Several years ago I saw a used oil filter at the bottom of my neighborhood creek. That's a pretty sad statement.