North Carolina General Statutes Chapter 119. Gasoline and Oil Inspection and Regulation § 119-11. Mixing different brands for sale under standard trade name prohibited

It shall be unlawful for any person or persons, firm or firms, corporation or corporations or any of their servants, agents or employees, to mix, blend or compound the liquid fuels, lubricating oils, greases or similar products of the manufacturer or distributor with the products of any other manufacturer or distributor, or adulterate the same, and expose or offer for sale or sell such mixed, blended or compounded products under the trade name, trademark or name or other distinguishing mark of either of said manufacturers or distributors, or as the adulterated products of such manufacturer or distributor: Provided, however, that nothing herein shall prevent the lawful owner thereof from applying its own trademark, trade name or symbol to any product or material.