Used oil means any oil that has been refined from crude oil, or any synthetic oil, that has been used and as a result of such use is contaminated by physical or chemical impurities (40 CFR §279.1). If hydraulic oil meets this definition, it is used oil.
The following memoranda discuss hydraulic oil and the definition of used oil:
Monthly Call Center Report Question; April 1997 (RCRA Online #14090 )
Memo, Shapiro to Crawford; January 12, 1994 (RCRA Online #11808 )
Memo, Lowrance to Redington; January 28, 1993 (RCRA Online #11724 )
Monthly Call Center Report Question; January 1988 (RCRA Online #13118 )
These memoranda are available in the at the RCRA Online database.
Is hydraulic oil regulated as used oil?
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