Bio-diesel was a big thing 10+yr ago when restaurants used to have waste oil they had to pay to get rid of. Now they all the restaurants have some recycler tha

Bio-diesel was a big thing 10+yr ago when restaurants used to have waste oil they had to pay to get rid of. Now they all the restaurants have some recycler that comes around and picks it up (who presumably sells it in bulk to someone who processes it into something). A diesel engine will burn basically any oily substance if you can find a way to get it into the engine without clogging up the plumbing bits. Nobody does it anymore because it's not cheap anymore and environmentalist circles have shifted to electric or anti-car whereas 10+yr ago biofuel was seen as a way to not drill in the arctic or spill oil in the gulf.