Heading 3811

Anti-knock preparations, oxidation and gum inhibitors, viscosity improvers, anti-corrosive preparations and the like, for mineral oils (including gasoline) or other liquids used for the same purposes

381111 Anti-knock preparations; based on lead compounds 381119 Anti-knock preparations; other than those based on lead compounds 381121 Lubricating oil additives; containing petroleum oils or oils obtained from bituminous minerals 381129 Lubricating oil additives; not containing petroleum oils or oils obtained from bituminous minerals 381190 Oxidation and gum inhibitors, viscosity improvers, anti-corrosive preparations, other prepared additives for mineral oils or liquids used as mineral oils (including gasoline), n.e.c. in heading no. 3811