... > SECTION VI - PRODUCTS OF THE CHEMICAL OR ALLIED INDUSTRIES > CHAPTER 38 - MISCELLANEOUS CHEMICAL PRODUCTS > 3811 Anti-knock preparations, oxidation inhibitors, gum inhibitors, viscosity improvers, anti-corrosive preparations and other prepared additives, for mineral oils (including gasoline) or for other liquids used for the same purposes as mineral oils > Anti-knock preparations > Based on lead compounds > Based on tetraethyl-lead