Subheading · Chapter 38 · Heading 3811
3811.90: Anti-knock preparations, oxidation inhibitors: other
Other fuel and oil additives
Official description Other
3811.90 is the HS subheading for other fuel and oil additives, under heading 3811 in chapter 38.
What you pay
Importing into UK
Rates by national line · UK Global Tariff
UK lines →- 3811 90 00 00 Other 4%
- 3811 90 00 40 Solution of a quaternary ammonium salt based on polyisobutenyl succinimide, containing by weight 10% or more but not more than 29.9% of 2-ethylhexanol 4%
- 3811 90 00 50 Corrosion inhibitor containing : - polyisobutenyl succinic acid and - more than 5% and not more than 20% by weight of mineral oils for use in the manufacture of blends of additives for fuels 4%
- 3811 90 00 60 Solution of mineral oils (cas rn 64742-52-5, 64742-53-6, 64742-56-9 or blends thereof) containing by weight: -25% or more but not more than 55% of the barium, calcium, magnesium or zinc salt of dinonylnaphthylsulphonic acid (cas rn 25619-56-1, 28015-99-8, 28016-00-4, or 57855-77-3) -whether or not, not more than 25% of the barium, calcium, magnesium or zinc salt of a mixture of c3-c24 carboxylic acids (cas rn 68990-37-4) 4%
- 3811 90 00 90 Other 4%
Additional duties and import rules
Charges on top of the customs duty, and rules the goods must meet at the border.
Additional duties and charges 3
- Duty suspensionAutonomous tariff suspension Free
- Applies to goods from
- all countries
- In force
- until 31 December 2028
- Legal act
- 2020 No. 1435
- Documents
- 9Y12
- Tariff lines
- on 3 of 4 lines
- Duty suspensionAirworthiness tariff suspension Free
- Applies to goods from
- all countries
- Legal act
- S.I. 2018/1249
- Documents
- C119 Authorised Release Certificate — EASA Form 1 (Appendix I to Annex I to Regulation (EU) No 748/2012), or equivalent certificate
- Excise dutyExcises
- Applies to goods from
- all countries
Import requirements 1
- Import controlRestriction on entry into free circulation
- Applies to goods from
- Russia, Ukraine
- Legal act
- 2023 No. 440, S.I. 2022/395
- Documents
- 9011
- 9022
- 9038
- 9009
- 9010
- 9017
Preferential rates by country
| Agreement or scheme | Countries | Rate |
|---|---|---|
| standard rate (no agreement) | — | 4% |
| DCTS Comprehensive | Afghanistan, Angola, Bangladesh, Benin and 38 moreAfghanistan, Angola, Bangladesh, Benin, Bhutan, Burkina Faso, Burundi, Cambodia, Central African Republic, Chad, Comoros, Congo - Kinshasa, Djibouti, Eritrea, Ethiopia, Gambia, Guinea, Guinea-Bissau, Haiti, Kiribati, Laos, Liberia, Malawi, Mali, Mauritania, Myanmar (Burma), Nepal, Niger, Rwanda, São Tomé & Príncipe, Senegal, Sierra Leone, Somalia, South Sudan, Sudan, Tanzania, Timor-Leste, Togo, Tuvalu, Uganda, Yemen, Zambia | Free |
| European Union (including code "EU") | Free | |
| DCTS Enhanced | Algeria, Bolivia, Cape Verde, Congo - Brazzaville and 13 moreAlgeria, Bolivia, Cape Verde, Congo - Brazzaville, Cook Islands, Kyrgyzstan, Micronesia, Mongolia, Nigeria, Niue, Pakistan, Philippines, Sri Lanka, Syria, Tajikistan, Uzbekistan, Vanuatu | Free |
| CARIFORUM | Antigua & Barbuda, Bahamas, Barbados, Belize and 10 moreAntigua & Barbuda, Bahamas, Barbados, Belize, Dominica, Dominican Republic, Grenada, Guyana, Jamaica, St Kitts & Nevis, St Lucia, St Vincent & the Grenadines, Suriname, Trinidad & Tobago | Free |
| OCTs (Overseas Countries and Territories) | Anguilla, Bermuda, British Indian Ocean Territory, British Virgin Islands and 7 moreAnguilla, Bermuda, British Indian Ocean Territory, British Virgin Islands, Cayman Islands, Falkland Islands, Montserrat, Pitcairn Islands, South Georgia & South Sandwich Islands, St Helena, Turks & Caicos Islands | Free |
| Central America | Costa Rica, El Salvador, Guatemala, Honduras, Nicaragua, Panama | Free |
| SADC EPA | Botswana, Eswatini, Lesotho, Mozambique, Namibia | Free |
| Eastern and Southern Africa States | Madagascar, Mauritius, Seychelles, Zimbabwe | Free |
| CPTPP | Brunei, Malaysia | Free |
| UK–Andorra agreement | Andorra | Free |
| UK–Albania agreement | Albania | Free |
| UK–Australia agreement | Australia | Free |
| UK–Canada agreement | Canada | Free |
| UK–Switzerland agreement | Switzerland | Free |
| UK–Côte d’Ivoire agreement | Côte d’Ivoire | Free |
| UK–Chile agreement | Chile | Free |
| UK–Cameroon agreement | Cameroon | Free |
| UK–Colombia agreement | Colombia | Free |
| UK–Ceuta & Melilla agreement | Ceuta & Melilla | Free |
| UK–Ecuador agreement | Ecuador | Free |
| UK–Egypt agreement | Egypt | Free |
| UK–Fiji agreement | Fiji | Free |
| UK–Faroe Islands agreement | Faroe Islands | Free |
| UK–Georgia agreement | Georgia | Free |
| UK–Ghana agreement | Ghana | Free |
| DCTS Standard | Indonesia | Free |
| UK–Israel agreement | Israel | Free |
| UK–India agreement | India | Free |
| UK–Iceland agreement | Iceland | Free |
| UK–Jordan agreement | Jordan | Free |
| UK–Japan agreement | Japan | Free |
| UK–Kenya agreement | Kenya | Free |
| UK–South Korea agreement | South Korea | Free |
| UK–Lebanon agreement | Lebanon | Free |
| UK–Liechtenstein agreement | Liechtenstein | Free |
| UK–Morocco agreement | Morocco | Free |
| UK–Moldova agreement | Moldova | Free |
| UK–North Macedonia agreement | North Macedonia | Free |
| UK–Mexico agreement | Mexico | Free |
| UK–Norway agreement | Norway | Free |
| UK–New Zealand agreement | New Zealand | Free |
| UK–Peru agreement | Peru | Free |
| UK–Papua New Guinea agreement | Papua New Guinea | Free |
| UK–Palestinian Territories agreement | Palestinian Territories | Free |
| UK–Serbia agreement | Serbia | Free |
| UK–Solomon Islands agreement | Solomon Islands | Free |
| UK–Singapore agreement | Singapore | Free |
| UK–San Marino agreement | San Marino | Free |
| UK–Tunisia agreement | Tunisia | Free |
| UK–Türkiye agreement | Türkiye | Free |
| UK–Ukraine agreement | Ukraine | Free |
| UK–Vietnam agreement | Vietnam | Free |
| UK–Samoa agreement | Samoa | Free |
| UK–Kosovo agreement | Kosovo | Free |
| UK–South Africa agreement | South Africa | Free |
UK: imports by month
Main suppliers, last 12 months
| Country | Value | Share | Change |
|---|---|---|---|
 Germany | £18.9m | 42.5% | +23.4% |
 Belgium | £11.2m | 25.1% | -16% |
 India | £5m | 11.3% | +1,130.1% |
 United States | £3.5m | 7.9% | +27.8% |
 France | £1.4m | 3.1% | -1.4% |
 Spain | £960k | 2.2% | +145.9% |
 Singapore | £732k | 1.6% | -14.7% |
 Netherlands | £689k | 1.5% | -35.7% |
Same subheading in other tariffs
EU
TürkiyeWorld trade in 2024
Trade value (US$) no reported trade < US$273kUS$273k+US$5m+US$27m+> US$175m
Exports: 130
- United States: US$669m
- Germany: US$598m
- Belgium: US$197m
- France: US$175m
- India: US$165m
- United Kingdom: US$106m
- Netherlands: US$97m
- Singapore: US$72m
- Japan: US$61m
- China: US$59m
- Italy: US$46m
- Australia: US$28m
- Spain: US$27m
- United Arab Emirates: US$24m
- Switzerland: US$20m
- Austria: US$20m
- Sweden: US$15m
- Denmark: US$14m
- Canada: US$12m
- Philippines: US$12m
- Czechia: US$11m
- Mexico: US$10m
- Russia: US$9m
- Poland: US$9m
- South Korea: US$8m
- Norway: US$8m
- Taiwan: US$8m
- Hungary: US$7m
- Indonesia: US$7m
- Brazil: US$7m
- Malaysia: US$5m
- Greece: US$5m
- Thailand: US$5m
- South Africa: US$4m
- Latvia: US$4m
- Slovenia: US$3m
- Hong Kong SAR China: US$3m
- Lithuania: US$3m
- Türkiye: US$3m
- Colombia: US$3m
- Egypt: US$2m
- Guatemala: US$2m
- Croatia: US$2m
- Portugal: US$2m
- Slovakia: US$2m
- Israel: US$2m
- New Zealand: US$1m
- Saudi Arabia: US$1m
- Kazakhstan: US$845k
- Tanzania: US$793k
- Finland: US$775k
- Vietnam: US$721k
- Belarus: US$616k
- Costa Rica: US$529k
- Peru: US$461k
- Ghana: US$461k
- Serbia: US$452k
- Iran: US$427k
- Ukraine: US$424k
- Ireland: US$407k
Trade value (US$) no reported trade < US$2mUS$2m+US$10m+US$43m+> US$70m
Imports: 209
- Canada: US$173m
- Belgium: US$143m
- United States: US$132m
- Mexico: US$125m
- France: US$113m
- Germany: US$87m
- Netherlands: US$70m
- Argentina: US$68m
- Saudi Arabia: US$67m
- Singapore: US$67m
- China: US$63m
- Poland: US$62m
- Malaysia: US$61m
- South Korea: US$57m
- United Arab Emirates: US$54m
- Thailand: US$53m
- Spain: US$52m
- United Kingdom: US$51m
- Italy: US$47m
- Brazil: US$45m
- Japan: US$43m
- Türkiye: US$40m
- India: US$38m
- Kazakhstan: US$38m
- South Africa: US$37m
- Australia: US$35m
- Indonesia: US$33m
- Colombia: US$31m
- Hungary: US$26m
- Denmark: US$24m
- Philippines: US$23m
- Egypt: US$22m
- Taiwan: US$21m
- Kuwait: US$21m
- Greece: US$19m
- Russia: US$19m
- Sweden: US$18m
- Angola: US$18m
- Austria: US$18m
- Peru: US$17m
- Portugal: US$16m
- Czechia: US$15m
- Finland: US$15m
- Qatar: US$14m
- Iraq: US$14m
- Vietnam: US$14m
- Slovakia: US$14m
- Romania: US$12m
- Israel: US$12m
- Norway: US$11m
- Switzerland: US$10m
- Nigeria: US$10m
- Chad: US$10m
- Oman: US$8m
- Bulgaria: US$8m
- Honduras: US$8m
- New Zealand: US$8m
- Chile: US$7m
- Ecuador: US$7m
- Pakistan: US$6m
Top exporters
| Rank | Country | Value | Share |
|---|---|---|---|
| 1 | United States | US$669m | 26.1% |
| 2 | Germany | US$598m | 23.3% |
| 3 | Belgium | US$197m | 7.7% |
| 4 | France | US$175m | 6.8% |
| 5 | India | US$165m | 6.4% |
| 6 | United Kingdom | US$106m | 4.2% |
| 7 | Netherlands | US$97m | 3.8% |
| 8 | Singapore | US$72m | 2.8% |
| 9 |  Japan | US$61m | 2.4% |
| 10 |  China | US$59m | 2.3% |
Top importers
| Rank | Country | Value | Share |
|---|---|---|---|
| 1 |  Canada | US$173m | 6.7% |
| 2 | Belgium | US$143m | 5.6% |
| 3 | United States | US$132m | 5.1% |
| 4 |  Mexico | US$125m | 4.9% |
| 5 | France | US$113m | 4.4% |
| 6 | Germany | US$87m | 3.4% |
| 7 | Netherlands | US$70m | 2.7% |
| 8 |  Argentina | US$68m | 2.7% |
| 9 |  Saudi Arabia | US$67m | 2.6% |
| 10 | Singapore | US$67m | 2.6% |
Binding rulings for similar goods 1
Decisions of U.S. Customs and Border Protection (CROSS) and HMRC (Advance Tariff Rulings) on goods classified here. A ruling binds only its holder, but shows how the authorities classify similar goods. The descriptions are the authorities’ own, in English.
- H303930 U.S. CBP
Tariff classification of Howes Diesel Treat; additive for mineral oil
The UK Global Tariff divides subheading 3811.90 into 4 tariff lines; the duty is 4%.
Subheading 3811.90 is a single line in the EU Combined Nomenclature, where the duty is 5.8%.
174 countries pay no duty in the UK thanks to trade agreements and preference schemes such as DCTS Comprehensive and European Union, against a standard rate of 4%.
Imports of other fuel and oil additives into the UK came to £44.5m between September 2025 and August 2026 (up 17% on the year before); Germany supplied 43%, followed by Belgium.
In 2024, countries exported other fuel and oil additives worth US$3bn (−6.5% year on year).
The largest exporter was the United States (US$669m), followed by Germany.
Products classified here
Questions and answers
What is the HS code for anti-knock preparations, oxidation inhibitors: other?
Anti-knock preparations, oxidation inhibitors: other fall under HS subheading 3811.90, part of heading 3811, in section VI of the Harmonized System.
What is the import duty on anti-knock preparations, oxidation inhibitors in the UK?
Under the UK Global Tariff, imports under 3811.90 from countries without a preferential agreement are charged at 4%. Preferential rates, anti-dumping duties and VAT are not included.
What is the import duty on anti-knock preparations, oxidation inhibitors in the EU?
Under the EU Combined Nomenclature, imports under 3811.90 from countries without a preferential agreement are charged at 5.8%. Preferential rates, anti-dumping duties and VAT are not included.
Which country exports the most anti-knock preparations, oxidation inhibitors?
The United States, with US$669m in 2024 (26.1% of world exports).
Which countries can export other fuel and oil additives to the UK duty-free?
174 countries pay no duty under a trade agreement or preference scheme, among them partners under DCTS Comprehensive, European Union, DCTS Enhanced. The goods must meet the agreement’s rules of origin and the importer needs proof of origin; otherwise the standard rate of 4% applies. Pick a country above to see its rate.
Where does the UK import other fuel and oil additives from?
In the 12 months to August 2026, the largest suppliers were Germany (43%), Belgium (25%) and India (11%), out of total imports of £44.5m.