No. 6 Fuel Oil
No. 6 fuel oil is a heavy residual fuel oil derived from petroleum refining, testing under 25 degrees A.P.I., used primarily for industrial boilers and large-scale heating systems. It falls under HTS 2710.20.05.50 as a distillate and residual fuel oil containing biodiesel blends with the specified gravity, not classified as crude or waste. This classification applies to fuel oils where petroleum oils exceed 70% by weight as the basic constituent.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If no biodiesel content
Fuel oils without biodiesel fall under the general petroleum oils subheading excluding biodiesel preparations.
If testing 25 degrees A.P.I. or greater
Higher gravity distillate/residual fuel oils shift to separate gravity-based subheadings.
If <70% petroleum oils
Preparations with less than 70% petroleum oils as basic constituents are classified as biodiesel mixtures elsewhere.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right HTS code — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Verify API gravity via certified lab testing (ASTM D287) to confirm under 25° for this subheading; misclassification risks penalties
• Include biodiesel content documentation and certificates of analysis showing >70% petroleum oils to meet basic constituent rules
• Ensure proper storage and transport manifests for hazardous materials; common pitfall is inadequate spill prevention plans
Related Products under HTS 2710.20.05.50
Bunker C Fuel Oil
Bunker C is a high-viscosity residual fuel oil from petroleum, under 25° A.P.I., blended with biodiesel for marine and power generation use. Classified in HTS 2710.20.05.50 due to its heavy gravity and biodiesel inclusion in preparations where petroleum exceeds 70% by weight. It's distinct from lighter fuels or crude oils.
Heavy Fuel Oil (HFO) Biodiesel Blend
Heavy Fuel Oil blended with biodiesel, testing under 25° A.P.I., serves as a low-cost energy source for ships and factories. HTS 2710.20.05.50 covers this as a residual fuel oil preparation with >70% petroleum oils and biodiesel, excluding waste or crude. Its density distinguishes it from lighter distillates.
Industrial Boiler Residual Fuel Oil
Residual fuel oil for industrial boilers, under 25° A.P.I. with biodiesel admixture, powers manufacturing heating. Under HTS 2710.20.05.50 for biodiesel-containing preparations >70% petroleum-based, not waste or crude. Meets chapter notes for fuel oils.
Power Plant Grade No. 6 Oil
No. 6 oil customized for power plants, heavy gravity under 25° A.P.I., with biodiesel for emissions compliance. HTS 2710.20.05.50 applies to such blended residual fuels where petroleum oils dominate. Used in electricity generation, not lighter fuels.