Subheading 381111: Anti-knock Preparations; Based on Lead Compounds
Subheading 381119: Anti-knock Preparations; other than Those Based on Lead Compounds
Subheading 381121: Lubricating Oil Additives; Containing Petroleum Oils or Oils Obtained from … etc.
Subheading 381129: Lubricating Oil Additives; not Containing Petroleum Oils or Oils … etc.
Subheading 381190: Oxidation and Gum Inhibitors, Viscosity Improvers, Anti-corrosive … etc.