### Question
How is the term re-refined oil defined?


### Answer
The term **re-refined oil** is defined in *42 U.S.C. § 6903* as the following:

> used oil from which the physical and chemical contaminants acquired through previous use have been removed through a refining process

#### Citation:
  - *42 U.S.C. § 6903*
  - Heading: **CHAPTER 82-SOLID WASTE DISPOSAL > SUBCHAPTER I-GENERAL PROVISIONS**

