Tell me about it. Around here it can't be found, even offering to pay market rate (and educating local businesses on the fact that I'm local myself, not some huge out-of-state waste hauler that couldn't care less about keeping the money in our economy). And unlike some people I've read about in the news, I'm not willing to steal it, though it would certainly be easy enough to do so. It seems if you're honest and want to conduct business in a straightforward manner, you're putting yourself at a disadvantage.

Yep. I have had no problem getting people on Craigslist to give me literally more WMO than I know what to do with, but the quality varies widely. Some of it is fantastic (nearly new hydraulic oil from a local power gate company), while some of it is terrible (barrels left out open in the rain, antifreeze mixed in, things like latex paint mixed in, etc). WMO smells terrible, is carcinogenic, makes a huge mess ...

I hope out here in the Wild West, that's not true, though I do worry about moving to a bigger city that would require me to do annual emissions tests. These old 1980s cars are great except for that aspect.

Well, my experiments have proven to me that WMO will mix readily with pump diesel no matter how contaminated it seems to be. But as far as getting rid of contaminants, I'm not convinced there's any way to do that short of owning a recyling facility.