33 CFR 151.49: Allowed Category C and D oil-like NLSs
Last reviewed: October 14, 2026
This section lists the Category C and D oil-like NLSs that the Coast Guard allows to be carried. Paragraph (a) names the Category C oil-like NLSs that may be carried. Paragraph (b) is reserved.
What it says
The Coast Guard allows the Category C and D oil-like NLSs on the list in this section to be carried.
“The following is a list of Category C and D Oil-like NLSs that the Coast Guard allows to be carried:”
The Category C oil-like NLSs listed in paragraph (a) may be carried.
33 CFR 151.49(a)“The following Category C oil-like NLSs may be carried:”
The list treats 2-Methyl-1-pentene as Hexene (all isomers).
33 CFR 151.49(a)“2-Methyl-1-pentene, see Hexene (all isomers)”
Common questions
Can toluene be carried as a Category C oil-like NLS?
Yes. Toluene is on the list of Category C oil-like NLSs that may be carried.
“The following Category C oil-like NLSs may be carried:”
Which Category C and D oil-like NLSs does the Coast Guard allow to be carried?
The Coast Guard allows the ones on the list in this section. The text lists only Category C substances in paragraph (a).
“The following is a list of Category C and D Oil-like NLSs that the Coast Guard allows to be carried:”
Does 33 CFR 151.49 list any Category D oil-like NLSs?
No. Paragraph (a) lists Category C oil-like NLSs, and paragraph (b) is reserved.
“The following Category C oil-like NLSs may be carried:”
The text of 33 CFR 151.49
Electronic Code of Federal Regulations (eCFR), current as of April 16, 2026 · Read it on eCFR
Category C and D Oil-like NLSs allowed for carriage
The following is a list of Category C and D Oil-like NLSs that the Coast Guard allows to be carried:
(a) The following Category C oil-like NLSs may be carried:
Aviation alkylates Cycloheptane Cyclohexane Cyclopentane p-Cymene Ethylcyclohexane Heptane (all isomers) Heptene (all isomers) Hexane (all isomers) Hexene (all isomers) iso-Propylcyclohexane Methyl cyclohexane 2-Methyl-1-pentene, see Hexene (all isomers) Nonane (all isomers) Octane (all isomers) Olefin mixtures (C5-C7) Pentane (all isomers) Pentene (all isomers) 1-Phenyl-1-xylylethane Propylene dimer Tetrahydronaphthalene Toluene Xylenes
(b) [Reserved]
The plain-English explanation on this page was written with AI from the regulation text above and checked automatically before publishing: every quote appears in the text, every number comes from it, and a second model confirmed each statement adds nothing the text doesn't say. Regulation text current as of April 16, 2026. The regulation text governs. RegKnot is not affiliated with the U.S. Coast Guard.