Recycling and re-refining are the applicable processes for the upgrading of petroleum based wastes (PBW) by converting them into reusable products such as gasoline and heavy oil. Possible acceptable processes are cracking and pyrolysis. The cracking process yields a highly unstable low-grade fuel oil that can be acid-corrosive, tarry, and discolored along with a characteristically foul odor Pyrolysis appears to be a technique that is able to reduce a bulky, high polluting industrial waste, while producing energy and/or valuable chemical compounds.