### Question
What is the definition of lubricating oil?


### Answer
The definition of **lubricating oil** is as follows in *42 U.S.C. § 6903*:

> the fraction of crude oil which is sold for purposes of reducing friction in any industrial or mechanical device

#### Citation:
  - *42 U.S.C. § 6903*
  - Heading: **CHAPTER 81-ENERGY CONSERVATION AND RESOURCE RENEWAL > SUBCHAPTER I-GENERAL PROVISIONS**

