Import duty / Chapter 38 / Heading 3811
Heading 3811 covers 5 tariff lines in LoadLoom's table; 4 of them clear duty-free under USMCA for goods made in Canada, the US or Mexico. Published US and Canadian rates below, verified October 2026. Pick the line that matches your goods for the worked example and border steps.
| HS code | Goods | US duty | Canada duty | USMCA |
|---|---|---|---|---|
| 3811.11 | Anti-knock preparations; based on lead compounds | Free | Free | Not eligible |
| 3811.19 | Anti-knock preparations; other than those based on lead compounds | 6.5% | Free | Free with certificate |
| 3811.21 | Lubricating oil additives; containing petroleum oils or oils obtained from bituminous minerals | 6.5% | Free | Free with certificate |
| 3811.29 | Lubricating oil additives; not containing petroleum oils or oils obtained from bituminous minerals | 6.5% | Free | Free with certificate |
| 3811.90 | Oxidation and gum inhibitors, viscosity improvers, anti-corrosive preparations, other prepared additives for mineral oils or liquids used as mineral oils (including gasoline), n.e.c. in heading no. 3811 | 6.5% | Free | Free with certificate |
This page is a free reference for shippers, not a customs ruling. Final classification and duty are determined by the licensed customs broker at entry, and government amounts are always billed at actual. Rates change with each tariff edition and trade action.
