Section 06 Products of the chemical or allied Industries 38 Miscellaneous chemical products 38 11 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 Commodity Code Description 38 11 11 Based on lead compounds 38 11 19 Other 38 11 21 Containing petroleum oils or oils obtained from bituminous minerals 38 11 29 Other 38 11 90 Other