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HTSUS, United States

3811.90.00.00

Other

Classification path

  1. Antiknock 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
  2. Other

Rates of duty

General (MFN)
6.5%
Column 2Cuba, North Korea, Russia, Belarus
3.7¢/kg + 60%
Unit of quantity
kg

Trade agreement rates

FreeGSP (lapsed since Dec 31, 2020), U.S.-Australia FTA, U.S.-Bahrain FTA, U.S.-Chile FTA, U.S.-Colombia TPA, AGOA (authorized through Dec 31, 2026), E, U.S.-Israel FTA, U.S.-Jordan FTA, U.S.-Korea FTA, U.S.-Morocco FTA, U.S.-Oman FTA, CAFTA-DR, U.S.-Panama TPA, U.S.-Peru TPA, USMCA, U.S.-Singapore FTA

Related lines in heading 3811

About heading 3811

Antiknock 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

Heading 3811 covers prepared additives that are put into mineral oils, gasoline, or other liquids used for the same purposes, such as antiknock preparations, oxidation inhibitors, gum inhibitors, viscosity improvers, and anti-corrosive preparations. The heading splits first by type of additive: antiknock preparations (3811.11 for lead-based, 3811.19 for other), additives for lubricating oils (3811.21 for those containing petroleum oils, 3811.29 for other), and a residual line 3811.90.00.00 for everything else in the heading.

Full guide to heading 3811

Products in this heading

  • Tetraethyl lead antiknock fluid for gasoline
  • Mixed tetraethyl and tetramethyl lead antiknock compound
  • Lead-based antiknock additive packages for motor fuel
  • Detergent and dispersant additive packages for engine oils containing petroleum oils
  • Viscosity index improvers for lubricating oils
  • Oxidation inhibitors for lubricating oils
  • Anti-corrosive additive preparations for oil-based fluids
  • Pour point depressants and other prepared lubricating oil additives

Frequently asked questions

What is the HTS code for antiknock preparations based on tetraethyl lead?

They are classified under 3811.11.10.00, which covers tetraethyl lead or a mixture of tetraethyl lead and tetramethyl lead. The general (MFN) rate is Free.

What is the duty on additives for lubricating oils that contain petroleum oils?

Additives for lubricating oils containing petroleum oils or oils obtained from bituminous minerals fall under 3811.21.00.00. The general (MFN) rate is 6.5%.

How do I classify a lead-based antiknock preparation other than tetraethyl lead?

Other lead-based antiknock preparations go under 3811.11.50.00. The general (MFN) rate is Free.

Source: USITC Harmonized Tariff Schedule, retrieved October 21, 2026.

HTS 3811.90.00.00: Other, 6.5% duty | HTSBase