Fuel oil
Fuel oil means any petroleum-based fuel (including diesel fuel or petroleum derivatives such as oil tar) and any recycled or blended petroleum products or petroleum by-products used as a fuel whether in a liquid, solid, or gaseous state.
Source
40 CFR § 96.302
Scoping language
The terms used in this subpart and subparts BBBB through IIII shall have the meanings set forth in this section as follows: