Protective oil
Protective oil means an organic material that is applied to metal for the purpose of providing lubrication or protection from corrosion without forming a solid film. This definition of protective oil includes, but is not limited to, lubricating oils, evaporative oils (including those that evaporate completely), and extrusion oils.
Source
40 CFR § 63.3176
Scoping language
Terms used in this subpart are defined in the CAA, in the General Provisions of this part, and in this section as follows: