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 Anti-knock preparations based on lead compounds 38 11 19 Other 38 11 21 Containing petroleum oils or oils obtained from ..., 38 11 29 Additives for lubricating oils (excl. with petroleum oils) 38 11 90 Other additives other than for lubricating oils, nes