"Waste oil" or "used oil" means any oil which has been refined from crude oil, has been used, and as a result of such use has been contaminated by physical or chemical impurities.
815 ILCS 440/2.1
"Waste oil" or "used oil" means any oil which has been refined from crude oil, has been used, and as a result of such use has been contaminated by physical or chemical impurities.
815 ILCS 440/2.1