UK Global Tariff · commodity code · HS 3811.90
3811 90 00 40: Other fuel and oil additives: 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
Other fuel and oil additives
✓ Can be used in a customs declaration Data: UK Global Tariff · checked on 24 October 2026
- 3811 Anti-knock 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
- 3811 90 00 00 Other
- 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
What you pay
Importing into UK
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
- 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 |
Footnotes
TN701 According to the Council Regulation (EU) No 692/2014 (OJ L183, p. 9), as retained in UK La…
The prohibition shall not apply in respect of:
(a) the execution until 26 September 2014, of trade contracts concluded before 25 June 2014, or of ancillary contracts necessary for the execution of such contracts, provided that the natural or legal persons, entity or body seeking to perform the contract have notified, at least 10 working days in advance, the activity or transaction to the competent authority of the Member State in which they are established.
(b) goods originating in Crimea or Sevastopol which have been made available to the Ukrainian authorities for examination, for which compliance with the conditions conferring entitlement to preferential origin has been verified and for which a certificate of origin has been issued in accordance with Regulation (EU) No 978/2012 and Regulation (EU) No 374/2014, as retained in UK Law, or in accordance with the EU-Ukraine Association Agreement
UK: imports by month · HS 3811.90
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
3811.90 Anti-knock preparations, oxidation inhibitors: other
EU 5.8% Third-country duty 1 tariff line 
Türkiye 5.8% Third-country duty 4 tariff lines USA 6.5% General (MFN) 1 tariff line 
Canada Free Third-country duty 2 tariff lines 
Mexico Free – 5% Third-country duty 2 tariff lines · average 2.5% 
Brazil Free – 12.6% Third-country duty 2 tariff lines · average 6.3% 
Argentina Free – 12.6% Third-country duty 8 tariff lines · average 1.6% 
Peru Free Third-country duty 1 tariff line 
New Zealand Free Third-country duty 1 tariff line 
Japan Free Third-country duty 2 tariff lines 
Taiwan 2.5% Third-country duty 1 tariff line 
GCC 5% Third-country duty 2 tariff lines 
Switzerland Free Third-country duty 2 tariff lines 
Norway Free Third-country duty 1 tariff line 
North Macedonia 6% Third-country duty 1 tariff line 
Nigeria 10% Third-country duty 1 tariff line UK lines: 3811.90
- 3811 90 00 40Solution of a quaternary ammonium salt based on polyisobutenyl succinimide, containing by weight 10% or more but not more than 29.9% of 2-ethylhexanol
- 3811 90 00 50Corrosion 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
- 3811 90 00 60Solution 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)
- 3811 90 00 90Anti-knock preparations, oxidation inhibitors: other, other
Binding rulings for similar goods
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
Legal notes
In the UK Global Tariff, 3811 90 00 40 is one of 4 lines under subheading 3811.90, anti-knock preparations, oxidation inhibitors: other.
The third-country duty is 4%.
Goods from 174 countries can enter the UK at a preferential rate instead of the standard 4%; 174 of them pay no duty at all, for example under DCTS Comprehensive or European Union.
In the 12 months to August 2026, the UK imported other fuel and oil additives (HS 3811.90) worth £44.5m (up 17% on the year before), at an average of £3.91 per kg; Germany supplied 43%, followed by Belgium.
For the same subheading, the EU duty is 5.8%, the Türkiye duty is 5.8%, the US duty is 6.5%, the Canada duty is free, the Mexico duty is 0%–5%, the Brazil duty is 0%–12.6%, the Argentina duty is 0%–12.6%, the Peru duty is free, the New Zealand duty is free, the Japan duty is free, the Taiwan duty is 2.5%, the GCC duty is 5%, the Switzerland duty is free, the Norway duty is free, the North Macedonia duty is 6% and the Nigeria duty is 10%.
The UK imported goods of subheading 3811.90 worth US$51m in 2024; the largest supplier was Germany.
Questions and answers
What is the UK import duty for commodity code 3811 90 00 40?
The third-country duty in the UK Global Tariff is 4%. Preferential rates for goods from agreement countries, anti-dumping duties and VAT are not included.
Which countries get a lower rate on 3811 90 00 40?
174 countries have a preferential rate on this line, 174 of them at 0%, under DCTS Comprehensive, European Union and DCTS Enhanced and other arrangements. The rate applies only to goods that meet the rules of origin of the agreement, with proof of origin. Choose the country of origin on this page to see its rate.
Where does the UK import these goods from?
For subheading 3811.90 as a whole, the largest supplier in 2024 was Germany (US$20m), followed by Belgium.
Typical products
Everyday names, not part of the legal text.