It shall be unlawful for any person to fill an order from a consumer for lubricating oil for internal combustion engines of automobiles, autotrucks or tractors with oil that is not designated by a trademark or distinctive trade name unless, at the time of sale, the oil is poured, drawn or taken for delivery from a can, drum or other container or bottle rack marked in such manner as to be legible and clearly visible to the purchaser with the words "Unbranded Lubricating Oil."