Brazil NCM · 8-digit subitem

NCM 3811.21.10 – Viscosity index improvers for lubricating oils

NCM 3811.21.10 (also written 38112110) is Brazil's code for viscosity index improvers for lubricating oils. Its first 6 digits are HS code 3811.21.

Official description of NCM 3811.21.10

PortuguêsOfficial
Melhoradores do índice de viscosidade
EnglishUnofficial translation

Viscosity index improvers

Nomenclatura Comum do Mercosul (Siscomex). Updated Oct 2026 · In force since Apr 2022 (Res Gecex 272/2021).

How to read NCM 3811.21.10

38Chapter 11Heading 21Subheading

HS code 3811.21
Same in every country

1Item 0Subitem

Added by Mercosur
Brazil, Argentina, Paraguay, Uruguay

The first 6 digits are the international HS code, so their meaning is the same in every country; Brazil publishes the text in Portuguese. Digits 7 and 8 are Brazil's own split of that HS code. The full 8-digit code is used on import declarations (DUIMP), invoices (NF-e) and tax filings.

Full classification path

  1. Chapter 38 Chemical products n.e.c. Produtos diversos das indústrias químicas.
  2. Heading 38.11 Anti-knock preparations, oxidation and gum inhibitors, viscosity improvers, anti-corrosive preparations and the like, for mineral oils (including gasoline) or other liquids used for the same purposes Preparações antidetonantes, inibidores de oxidação, aditivos peptizantes, beneficiadores de viscosidade, aditivos anticorrosivos e outros aditivos preparados, para óleos minerais (incluindo a gasolina) ou para outros líquidos utilizados para os mesmos fins que os óleos minerais.
  3. Group 3811.2 Additives for lubricating oils: Aditivos para óleos lubrificantes:
  4. Subheading 3811.21 Lubricating oil additives; containing petroleum oils or oils obtained from bituminous minerals Que contenham óleos de petróleo ou de minerais betuminosos
  5. Subitem 3811.21.10 Viscosity index improvers Melhoradores do índice de viscosidade

Other NCM codes under HS 3811.21

3811.21.20 Zinc dithiophosphate anti-wear oil additivesAntidesgastes, anticorrosivos ou antioxidantes, que contenham dialquilditiofosfato de zinco ou diarilditiofosfato de zinco 3811.21.30 Ashless dispersants with petroleum oilsDispersantes sem cinzas 3811.21.40 Metallic detergents with petroleum oilsDetergentes metálicos 3811.21.50 Lube oil additive blends with petroleum oilsOutras preparações que contenham, pelo menos, um de quaisquer dos produtos compreendidos nos itens 3811.21.10, 3811.21.20, 3811.21.30 e 3811.21.40 3811.21.90 Other lube oil additives with petroleum oilsOutros

Questions about NCM 3811.21.10

What is NCM 3811.21.10?

NCM 3811.21.10 (38112110) is the Brazilian (Mercosur) code for viscosity index improvers for lubricating oils. Its official Portuguese description is “Melhoradores do índice de viscosidade”.

What is the HS code for NCM 3811.21.10?

HS 3811.21 (Lubricating oil additives; containing petroleum oils or oils obtained from bituminous minerals). The first 6 digits of an NCM code are its international HS code; the last 2 digits are Brazil's own split.

Is an NCM code the same as an HS code?

The first 6 digits are the same in every country. NCM adds an item digit (7th) and a subitem digit (8th). A code ending in 00 means Brazil does not split that HS code further.

Which countries use NCM 3811.21.10?

All Mercosur members use the same NCM codes: Argentina, Brazil, Paraguay and Uruguay.

Source: Siscomex Classif NCM table, updated Oct 2026 (Resolução Gecex nº 926/2026). The Portuguese text is the official one; the English is our translation.