No person, firm or corporation shall sell or offer for sale at retail, gasoline or petroleum products for motor vehicle use, in any manner which deceives or tends to deceive a purchaser or prospective purchaser as to price, quality or identity of the product. The pump, dispensing device or container shall have the name, brand, symbol, mark and minimum research octane rating or minimum research cetane rating affixed to it of the gasoline or petroleum product sold or offered for sale, and the product therein cannot be substituted, mixed or adulterated. For the purpose of this Section, "Research Octane Rating" or "Research Cetane Rating" shall mean the research octane rating as described in the American-Society for Testing Materials (ASTM) 'Standard Specifications for Gasoline' (D439-70), or "Standard Classification of Diesel Fuel Oil", (D 975-68).