That stuff was not meant to be burned either as a fuel...
Yes, not in a diesel , but...
My son heats his shop (auto repair) with a waste oil furnace. The manufacturer told him that the 2 hottest fuels to burn in it are brake fluid and atf.
Of course there is a pre-heater in this system. Furnace is made by "Black Gold" .
Just thought I'd throw that in here for what it's worth!
Jay