Section 06 PRODUCTS OF THE CHEMICAL OR ALLIED INDUSTRIES 38 Miscellaneous chemical products 38 11 Anti-knock preparations, oxidation inhibitors, gum inhibitors, viscosity improve 38 11 11 38 11 11 00 Commodity Code Description 38 11 11 00 00 -- Based on lead compounds 38 11 19 00 00 -- Other 38 11 21 00 00 -- Containing petroleum oils or oils obtained from bituminous minerals 38 11 29 00 00 -- Other 38 11 90 00 00 - Other