N.J. Admin. Code § 7:27F-3.1
The following words and terms, when used in this subchapter, shall have the following meanings unless the context clearly indicates otherwise.
"Fuel oil" means a liquid or liquefiable petroleum product derived directly or indirectly from crude oil, which is produced, manufactured, used, or sold for the generation of heat or power.
"No. 4 fuel oil" means a distillate fuel oil made by blending distillate fuel oil and residual fuel oil stocks. It conforms with ASTM Specification D 396 or Federal Specification VV-F-815C and is used extensively in industrial plants and in commercial burner installations that are not equipped with preheating facilities. It also includes No. 4 diesel fuel used for low- and medium-speed diesel engines and conforms to ASTM Specification D 975.
"No. 6 fuel oil" means fuel oil that includes Bunker C fuel oil and is used for the production of electric power, space heating, vessel bunkering, and various industrial purposes.
N.J. Admin. Code § 7:27F-3.1