Also burning used motor oil (as well as used ATF) releases very cancer causing particles.
"Back in the day" up north almost all automotive repair shops burned the used auto oil, & used tranny fluid to help heat the shop. After studies showed the link between this burning of auto fluids and cancer the practice was banned I think in the late 1970's
It must be something with low heat as incinerators are licensed to dispose of used auto fluids.