N.H. Rev. Stat. § 339-B:7
It is unlawful for any person to mix, blend, compound or adulterate the liquid fuel, lubricating oil, grease, or similar product of a manufacturer or distributor with a liquid fuel, lubricating oil, grease or similar product of the same manufacturer or distributor of a character or nature different from the character or nature of the liquid fuel, lubricating oil, grease or similar product so mixed, blended, compounded or adulterated, and expose for sale, offer for sale, or sell the same as the unadulterated product of such manufacturer or distributor, or as the unadulterated product of any other manufacturer or distributor. Nothing in this chapter shall be construed to prevent the lawful owner of such products from applying his own trademark, trade name or symbol to any product or material.
RSA 339-B:7
1971, 404:1, eff. Aug. 28, 1971.