N.C. Gen. Stat. § 119-2
It shall be unlawful for any person, firm or corporation to sell, offer for sale or delivery, or to cause or permit to be sold, offered for sale or delivery, any oil represented as lubricating oil for internal combustion engines unless there shall be firmly attached to or painted at or near the point or outlet from which said oil represented as lubricating oil for internal combustion engines is drawn or poured out for sale or delivery, a sign or label consisting of the word or words in at all times legible letters not less than one-half inch in height comprising the brand or trade name of said lubricating oil: Provided, that if any of said lubricating oil shall have no brand or trade name, the above required sign or label shall consist of the words in letters not less than three inches high, "Lubricating Oil No Brand."
N.C. Gen. Stat. § 119-2