A blended product containing 70% or more by weight of petroleum or bituminous mineral oils falls under heading 2710, provided it is not crude. Blends falling below that threshold are typically classified based on their predominant component or as preparations under Chapter 38. Importers of biodiesel blends should pay particular attention to whether the blend meets the 70% threshold and whether it falls under subheading 271020.

Waste oils containing PCBs, PCTs, or PBBs (271091) are subject to EPA regulations under the Toxic Substances Control Act (TSCA), and importers must comply with TSCA import certification requirements. Other waste oils (271099) may also be subject to EPA hazardous waste regulations depending on their composition. Importers should consult EPA guidance and ensure proper manifesting and disposal documentation before entry.