Sourcing petrol octane boosters from China
The supplied anti-knock lines carry 4% to 6% UK customs duty from China, with a conditional 0% suspension for a listed manganese solution. Motor-fuel additives also attract excise duty. Check the formula, chemical compliance and octane test evidence before ordering. Cambridge China Bridge sources petrol octane booster additive blends.
Customs duty and fuel excise
Read from the UK Trade Tariff on 29 September 2026, heading 3811 covers prepared additives for mineral oils, including petrol. This guide focuses on octane booster blends. The table includes the supplied anti-knock lines and a corrosion inhibitor used in fuel additive blending. The inhibitor is a blending ingredient, not an octane booster by itself. See the wider fuel and oil additives guide.
The supplied Chinese-origin anti-knock lines carry 4%, except tetraethyl-lead preparations at 6%. The listed manganese solution and fuel-blending corrosion inhibitor have conditional 0.00 % suspensions. Their footnotes exclude mixtures, preparations or products containing these products, so do not assume a finished booster inherits the suspension. The selected lines show no anti-dumping or countervailing measures and no attached import controls. HMRC says motor-fuel additives attract excise duty; ask your broker to assess it separately.
Give your broker the full formula, component concentrations, intended use and safety data sheet to confirm the commodity code. The supplied facts do not identify a general residual line for every finished non-lead booster. Do not force a retail blend into the listed manganese solution code. A tariff entry for a lead-based preparation does not establish its suitability for your proposed sale or use.
| Goods | Commodity code | Duty | Anti-dumping or countervailing duty on China |
|---|---|---|---|
| Methylcyclopentadienyl manganese tricarbonyl solution meeting the listed composition | 3811 19 00 10 | 4% | None |
| Anti-knock preparations based on tetraethyl-lead | 3811 11 10 00 | 6% | None |
| Anti-knock preparations based on other lead compounds | 3811 11 90 00 | 4% | None |
| Listed polyisobutenyl succinic acid corrosion inhibitor for fuel additive blending | 3811 90 00 50 | 4% | None |
Specify the formula and octane claim
Specify the active chemistry, solvent, concentration tolerances, lead and manganese content, density, flash point, storage conditions and pack materials. Distinguish a blending concentrate from a finished pour-in product. Require written approval before the factory changes the active ingredient or solvent.
Define the claimed octane improvement against a named base petrol, dosage and test method. Ask whether the claim concerns research octane or motor octane, and require the underlying laboratory report. Agree compatibility checks for seals, fuel-system materials and the intended engine application. Use testing and certification support to agree the test brief.
Assess the UK REACH position for the constituent substances; registration is per substance, per legal entity. Check classification, labels and packaging before GB sale. Everyone in the supply chain is responsible for correct labelling and packaging. Hazardous chemicals supplied for workplace use require a safety data sheet; request an English version matching the actual blend.
Worked duty example
Illustrative example, not a quote: Illustrative order: 5 tonnes of the listed anti-knock concentrate, assuming the suspension is not claimed; excise duty requires separate assessment under 3811 19 00 10, invoiced at £30,000 free on board, with £2,500 of freight and insurance to the UK. The customs value is £32,500. Duty at 4% is £1,300. Import VAT at 20% is charged on the customs value plus duty, £33,800, so it is £6,760. Import taxes total £8,060; a VAT-registered importer can usually reclaim the VAT, so the lasting cost is the £1,300 of duty. The import duty and VAT guide explains each step.
Inspection checklist
Composition: check batch analysis against the agreed active content and solvent profile, and test lead or manganese where relevant.
Performance: check the laboratory report identifies the base petrol, dosage and tested batch, with untreated and treated results.
Packs: check fill quantity, cap seals, leakage, solvent compatibility and batch identification on arrival.
Documents: check the safety data sheet and labels match the formula, and reconcile batch records with the shipment. Agree sampling through the quality inspection guide.
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What goes wrong
An octane claim can be unusable when the supplier omits the base petrol, dosage or test method. Other failure points include diluted active content, substituted solvent, sediment, leaking closures and documents copied from a different formula. Retain an approved sample and compare the production batch before accepting it.
Costing only customs duty misses the separate fuel excise liability. A suspension for a listed ingredient can also be wrongly applied to a finished blend. Confirm both treatments before shipment, and keep the commercial specification separate from the customs description.
Cambridge China Bridge sources these products for UK businesses, checking the factory and the documents before shipment. See factory verification. For repeat volumes, see container programmes.
Frequently asked questions
What is the UK import duty on petrol octane boosters from China?
The supplied anti-knock lines carry 4% or 6%; a listed manganese solution has a conditional 0.00 % suspension. Confirm the finished blend's code. Fuel excise is separate.
Do petrol octane boosters attract fuel excise duty?
Yes. HMRC says all motor-fuel additives are liable to excise duty. Ask your customs broker to assess the treatment of your formula and intended use separately from customs duty.
How do I verify a Chinese supplier's octane claim?
Request a laboratory report naming the base petrol, dosage, test method and batch. Compare untreated and treated fuel results; a claim without those details is insufficient for your purchasing decision.
Can I use the manganese solution code for any finished booster?
No automatic match follows from containing manganese. The supplied line describes a specific solution, and its suspension excludes preparations containing that product. Confirm the complete formula with your broker.