Wisconsin Statutes Police Regulations (Ch. 163 to 177) § 168.14. Misbranding

(1) It is unlawful for any person to represent, advertise, promote for sale, offer for sale or sell any lubricating oil which is in part or wholly derived from previously used lubricating oil unless such representation, advertisement, sales promotion and the container or item of equipment through which such previously used lubricating oil is shipped, stored, offered for sale or sold, clearly and conspicuously identifies to the public that such lubricating oil has been previously used. The identification shall contain appropriate and descriptive words such as “Reclaimed used lubricating oil,” “Rerefined used lubricating oil,” “Recleaned used lubricating oil” or “Reconditioned used lubricating oil”.

(2) No person may receive, unload, use, sell or offer for sale in this state, any gasoline, gasoline-alcohol fuel blends, kerosene, fuel oils, diesel fuels or other petroleum distillates which the person knows, or reasonably should know, is misidentified as to name or grade. Gasoline-ethanol blends that are identified in compliance with s. 168.11 when sold at retail are correctly identified as to name. Biodiesel blends that are identified in compliance with sub. (2m)(c)4. when sold at retail are correctly identified as to name.

(3) A person who sells a gasoline-ethanol fuel blend to a person selling or offering to sell it at wholesale or retail shall provide information before the sale on the ethanol content of the fuel blend to the person selling or offering to sell it and shall provide written verification of the ethanol content at delivery of the fuel blend.