Straight mineral lubricating oils (refined petroleum products used as-is) are classified in petroleum product headings, while 59772 captures formulated preparations where petroleum oil is blended with additives, thickeners, or non-petroleum components to create a product with specific performance properties. The compounded, multi-ingredient nature of the preparation — not just petroleum content — is the defining characteristic.

Depending on the specific HTS subheading and country of origin, some lubricating preparations may be subject to antidumping or countervailing duty orders, or to Section 301 tariffs for Chinese-origin goods. Importers should verify the applicable 10-digit HTS code and check current trade remedy orders before committing to sourcing arrangements.