3811.21.00.00 - Containing petroleum oils or oils obtained from bituminous minerals

This HTS category, 3811.21.00.00, specifically covers prepared additives for lubricating oils that contain petroleum oils or oils obtained from bituminous minerals. These additives are designed to enhance the performance of lubricating oils by incorporating components derived from petroleum or bituminous sources, such as specific base oils or solvent fractions. Examples include certain types of viscosity modifiers, pour point depressants, or anti-wear additives where the active ingredient is fundamentally a petroleum-derived oil or a similar product from bituminous minerals.

The key differentiator for this subcategory lies in the *composition* of the additive. While the parent category 3811.2 covers all additives for lubricating oils, this specific heading narrows the scope to those where petroleum oils or oils from bituminous minerals are the principal or defining component. This distinguishes it from the sibling category 3811.29.00.00, "Other," which would encompass additives for lubricating oils that do not meet the compositional criteria of this heading, such as those based on synthetic esters, silicones, or purely mineral-based (non-oil) compounds.

As this is a leaf node, there are no further subcategories. Classification under 3811.21.00.00 is determined by the presence of petroleum oils or oils from bituminous minerals as a significant or constituent element within the prepared additive for lubricating oil. This ensures that products primarily reliant on these specific oil bases are appropriately categorized, distinguishing them from other lubricant additives with different base materials or functionalities.