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used oil

Defined in 2 places of the United States Code.

The term “used oil” means any oil which has been—

(A) refined from crude oil,

(B) used, and

(C) as a result of such use, contaminated by physical or chemical impurities.

Source

the term “used oil” means 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.

Source