Section 06 Products of the chemical or allied 38 Miscellaneous chemical products 38 11 Anti-knock preparations, oxidation inhibitors..., to use as mineral oils 38 11 21 Additives for lubricating oils with petroleum oils 38 11 21 00 Additives for lubricating oils with petroleum oils Commodity Code Description 38 11 21 00 00 Additives for lubricating oils with petroleum oils