CentralNotice Gutter oil From Wikipedia, the free encyclopedia Jump to: navigation , search Gutter oil ( simplified Chinese : 地沟油 ; traditional Chinese : 餿水油 ; pinyin : Dìgōu yóu ) is a term used in China and Taiwan to describe illicit cooking oil which has been recycled from waste oil collected from sources such as restaurant fryers, sewer drains, grease traps and slaughterhouse waste . Reprocessing is often very rudimentary; techniques include filtration , boiling, refining and the removal of adulterants. [ 1 ] It is then packaged and resold as a cheaper alternative to normal cooking oil. Another version of gutter oil uses discarded animal parts, animal fat and skins, internal organs, and expired or otherwise low-quality meat which is then cooked in large vats in order to extract the oil. Used kitchen oil can be purchased for between 859 and 937 dollars per ton while the...