It shall be unlawful for a person, firm or corporation to mix, blend or compound, the liquid fuels, lubricating oils, greases or similar products of any manufacturer or any distributor with the products of any other manufacturer or distributor or to adulterate the same and expose the same for sale, offer for sale or sell the same under the trademark, trade name, name or other distinguishing mark of either said manufacturer or distributor or as the unadulterated product of such manufacturers or distributors; provided, however, that nothing herein shall be construed to prevent the lawful owner thereof from applying his or its own trademark, trade name or symbols, to any product or material.