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HTS 3811Antiknock 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

Product or HTS code

Rate lines6

Code	Description	General	Special	Column 2	Units	Calculate
	Antiknock preparations
3811.11	3811.11Based on lead compounds
3811.11.10.00	3811.11.10.00Based on tetraethyl lead or on a mixture of tetraethyl lead and tetramethyl leadGeneral Free · Column 2 30% · kg	Free		30%	kg
3811.11.50.00	3811.11.50.00OtherGeneral Free · Column 2 25% · kg	Free		25%	kg
3811.19.00.00	3811.19.00.00OtherGeneral 6.5% · Special Free (A+,AU,BH,CL,CO,D,E, IL,JO, KR,MA,OM,P, PA,PE,S,SG) · Column 2 3.7¢/kg + 60% · kg	6.5%	Free (A+,AU,BH,CL,CO,D,E, IL,JO, KR,MA,OM,P, PA,PE,S,SG)	3.7¢/kg + 60%	kg
	Additives for lubricating oils
3811.21.00.00	3811.21.00.00Containing petroleum oils or oils obtained from bituminous mineralsGeneral 6.5% · Special Free (A+,AU,BH,CL,CO,D, E,IL, JO,KR,MA,OM,P, PA,PE,S,SG) · Column 2 60% · kg	6.5%	Free (A+,AU,BH,CL,CO,D, E,IL, JO,KR,MA,OM,P, PA,PE,S,SG)	60%	kg
3811.29.00.00	3811.29.00.00OtherGeneral 6.5% · Special Free (A+,AU,BH,CL,CO,D, E,IL, JO,KR,MA,OM,P, PA,PE,S,SG) · Column 2 25% · kg	6.5%	Free (A+,AU,BH,CL,CO,D, E,IL, JO,KR,MA,OM,P, PA,PE,S,SG)	25%	kg
3811.90.00.00	3811.90.00.00OtherGeneral 6.5% · Special Free (A+,AU,BH,CL,CO,D, E,IL, JO,KR,MA,OM,P, PA,PE,S,SG) · Column 2 3.7¢/kg + 60% · kg	6.5%	Free (A+,AU,BH,CL,CO,D, E,IL, JO,KR,MA,OM,P, PA,PE,S,SG)	3.7¢/kg + 60%	kg

2026 HTS Revision 21 (October 9, 2026)

Duty by country of origin

Rate line	Canada16.75% of imports	Mexico15.83% of imports	France14.55% of imports	Germany10.68% of imports	India9.73% of imports	Italy9.71% of imports	Japan4.71% of imports	Singapore4.43% of imports	United Kingdom3.99% of imports	South Korea3.7% of imports
3811.11.10.00Based on tetraethyl lead or on a mixture of tetraethyl lead and tetramethyl lead	10%9903.05.29	10%9903.05.55	10%9903.05.39	10%9903.05.39	10%9903.05.44	10%9903.05.39	12.5%9903.05.49	12.5%9903.05.68	10%9903.05.81	12.5%9903.05.71
3811.11.50.00Other	10%9903.05.29	10%9903.05.55	10%9903.05.39	10%9903.05.39	10%9903.05.44	10%9903.05.39	12.5%9903.05.49	12.5%9903.05.68	10%9903.05.81	12.5%9903.05.71
3811.19.00.00Other	From 16.5%9903.05.29Depends on product facts	From 16.5%9903.05.55Depends on product facts	From 10%9903.05.39Depends on product facts	From 10%9903.05.39Depends on product facts	From 16.5%9903.05.44Depends on product facts	From 10%9903.05.39Depends on product facts	From 12.5%9903.05.49Depends on product facts	From 19%9903.05.68Depends on product facts	From 16.5%9903.05.81Depends on product facts	From 12.5%9903.05.71Depends on product facts
3811.21.00.00Containing petroleum oils or oils obtained from bituminous minerals	From 66.5%9903.05.299903.03.14Depends on product facts	From 16.5%9903.05.55Depends on product facts	From 10%9903.05.39Depends on product facts	From 10%9903.05.39Depends on product facts	From 16.5%9903.05.44Depends on product facts	From 10%9903.05.39Depends on product facts	From 12.5%9903.05.49Depends on product facts	From 19%9903.05.68Depends on product facts	From 16.5%9903.05.81Depends on product facts	From 12.5%9903.05.71Depends on product facts
3811.29.00.00Other	16.5%9903.05.29	16.5%9903.05.55	10%9903.05.39	10%9903.05.39	16.5%9903.05.44	10%9903.05.39	12.5%9903.05.49	19%9903.05.68	16.5%9903.05.81	12.5%9903.05.71
3811.90.00.00Other	16.5%9903.05.29	16.5%9903.05.55	10%9903.05.39	10%9903.05.39	16.5%9903.05.44	10%9903.05.39	12.5%9903.05.49	19%9903.05.68	16.5%9903.05.81	12.5%9903.05.71

Total duty on a $10,000 ocean shipment entered 2026-10-13, before customs fees. Origins are the leading sources of US imports under this heading in 2025 (US Census Bureau).