Code 3811 90 · Heading 3811

Mineral-oil and similar-liquid additives for oxidation, corrosion, resin formation or viscosity, excluding anti-knock and lubricant additives

This covers prepared additives for mineral oils, including petrol, or for other liquids used for the same purposes as mineral oils. They must be for counteracting oxidation, corrosion or resin formation, increasing viscosity, or another such purpose, and must not be anti-knock preparations or lubricant additives.

See the official tariff text

Official tariff text

Oxidation inhibitors, gum inhibitors, viscosity improvers, anti-corrosive preparations and other prepared additives for mineral oils, incl. gasoline, or for other liquids used for the same purposes as mineral oils (excl. anti-knock preparations and oil lubricant additives)

How we got to this code

VI
38
3811
3811 90

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The path to this code

Every code is reached through these choices, one level at a time.

Step 4 of 4

Step 1 · Section VI Products of the chemical or allied industries
Is it an inorganic or organic chemical; a pharmaceutical product; a fertilizer; a tanning or dye extract, pigment, paint, varnish, filler or printing ink; an essential oil, perfume, cosmetic or toilet product; soap, a surface-active, washing, cleaning, polishing or wax product; a protein, modified starch, glue or enzyme; an explosive, pyrotechnic article, match or other specified combustible material; a photographic or cinematographic product; or another chemical product?
✓
Step 2 · Chapter 38 Miscellaneous chemical products 11 of 11 chapters in section VI
Which specific product type is it: a carbon or mineral product, resin or terpentine product, pesticide, textile, paper or leather treatment, soldering or welding preparation, oil or fuel additive, rubber or plastic additive, fire-extinguishing preparation, solvent or paint remover, catalyst, refractory product, alkylbenzene or alkylnaphthalene mixture, doped electronic material, hydraulic fluid, antifreeze or de-icing liquid, culture substrate, diagnostic or laboratory reagent, fatty acid or fatty alcohol, foundry binder or other chemical preparation, chemical waste, biodiesel, or a mixture containing halogenated methane, ethane or propane derivatives?
✓
Step 3 · Heading 3811 Anti-knock preparations, oxidation inhibitors, gum … 11 of 27 headings under chapter 38
Is it a gasoline anti-knock preparation, a lubricating-oil additive, or another prepared additive for mineral oils or liquids used for the same purposes—and, if it is a gasoline anti-knock preparation or lubricating-oil additive, does it have the stated lead-compound or petroleum-oil content?
✓
Step 4 · Subheading 3811 90 Oxidation inhibitors, gum inhibitors, viscosity imp… 5 of 5 subheadings under heading 3811
Is it a prepared additive for mineral oil, including petrol, or for another liquid used for the same purpose as mineral oil, intended to counteract oxidation, corrosion or resin formation, increase viscosity, or serve another such purpose, and not an anti-knock preparation or lubricant additive?

Pick the 8-digit code

Import duty on the codes below: 5.8%

Only one code below

3811 90 00

5.8%

This subheading has one 8-digit code, so that is the code to use.

Open 3811 90 00 Save

Compare the sibling codes

See all 5 codes at this level

3811 11 Anti-knock preparations for motor fuels based on lead compounds 5.8–6.5%
3811 19 Anti-knock preparations for motor fuels (excl. those based on lead compounds) 5.8%
3811 21 Prepared additives for oil lubricants containing petroleum oil or bituminous mineral oil 5.3%
3811 29 Prepared additives for oil lubricants not containing petroleum oil or bituminous mineral oil 5.8%
3811 90 Oxidation inhibitors, gum inhibitors, viscosity improvers, anti-corrosive preparations and other prepared additives for mineral oils, incl. gasoline, or for other liquids used for the same purposes as mineral oils (excl. anti-knock preparations and oil lubricant additives) you are here 5.8%

Selling to Norway, Great Britain and the United States

What they charge on arrival.

Norway, Great Britain and the United States use their own tariff lines under the 6-digit HS code. The rates below are what their customs charge on goods arriving from the EU. Match the goods against each country's own wording before you rely on a rate.

Norway

Duty free

Their lines1 Norwegian line

38.11.9000 Other

Norwegian tariff data checked Sept. 13, 2026.

Great Britain

4.0%

Their lines4 British lines
EU originDuty free

3811 90 00 40 Solution of a quaternary ammonium salt based on polyisobutenyl succinimide

Northern Ireland follows other rules.

UK tariff data checked Sept. 13, 2026.

United States

10.0%

Estimated from published US measures

Their lines1 US line
Entry dateSept. 17, 2026

3811.90.00.00 Antiknock preparations, oxidation inhibitors, gum inhibitors, viscosity improvers

The US importer of record files the entry.

US tariff data checked Sept. 16, 2026.

See the 1 Norwegian line

Selling to Norway

Norway splits the 6-digit category its own way, so these are Norway's own lines under it, not this EU code. Check your product against their wording; what Norwegian customs charges is shown per line.

38.11.9000

Other

Ordinary duty

Duty free

Norwegian tariff data version 1.5/1.2, last checked Sept. 13, 2026.

Contains data from Norwegian Customs (data.toll.no), licensed under CC BY 4.0, adapted for display.

See the 4 British lines

Selling to Great Britain

What UK customs charges when goods like these arrive in Great Britain.

All 4 UK lines under this code

They all have the same duty rates shown here.

Ordinary duty

4.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.

These rates apply in Great Britain. Different rules may apply for goods entering Northern Ireland.

UK tariff data version v4.0.1599, last checked Sept. 13, 2026.

Contains public sector information licensed under the Open Government Licence v3.0.

Source: UK Department for Business and Trade (data.api.trade.gov.uk).

See the 1 US line

Selling to the United States

What US customs charges when goods like these arrive from the EU. The US importer of record files the entry and pays the duty.

3811.90.00.00

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, Other

General rate

6.5%

From the EU

10.0% Estimated from published US measures US headings applied: 9903.05.39 Section 301 forced-labour action, 91 FR 47318 (memorandum 91 FR 47717), U.S. note 52 to subchapter III of chapter 99

Worked out for an entry on Sept. 17, 2026.

US tariff schedule 2026HTSRev19, last checked Sept. 16, 2026.

Last change we recorded: Revision 19 (2026), Sept. 16, 2026.

Anti-dumping and countervailing duties, US import taxes and customs fees are not included.

The descriptions above are the US tariff texts, which the United States publishes in English only.

Source: the US International Trade Commission's Harmonized Tariff Schedule (hts.usitc.gov), public domain, and the measures published in the Federal Register.

This is a planning estimate from the US Harmonized Tariff Schedule (revision shown) and the published Federal Register measures as of the date shown, for a shipment of EU origin. It is not a customs entry, legal advice or a broker's opinion, and tariffs.help is not a US-licensed customs broker. The US importer of record or their broker confirms the classification, origin, value and the duty due before filing.

Duty rates shown here are estimates, read from official EU / Danish, Norwegian and UK tariff data for orientation only. Confirm the current rate with Toldstyrelsen, TARIC, Norwegian Customs or the UK Online Trade Tariff before you file. The rate you pay can also depend on the country of origin. These are base customs duties only: import VAT, excise duties, anti-dumping duties and safeguard or quota measures are not included.