### Question
How is the term used oil defined?


### Answer
The term **used oil** is defined in *42 U.S.C. § 6363* as the following:

> 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

#### Citation:
  - *42 U.S.C. § 6363*
  - Heading: **CHAPTER 77-ENERGY CONSERVATION > SUBCHAPTER III-IMPROVING ENERGY EFFICIENCY > Part D-Other Federal Energy Conservation Measures**

