Segmentation by type classifies oxidation inhibitors into phenolic, aminic, sulfur‑containing, organophosphate, and metal‑based chemistries. Phenolic inhibitors, characterized by aromatic hydroxyl groups, dominate the market due to their broad temperature stability and cost efficiency, influencing roughly half of total sales. Aminic variants, incorporating nitrogen functionality, capture about 20 % of revenue, favored in high‑performance lubricants where synergistic anti‑wear properties are required. Sulfur‑containing inhibitors, comprising thio‑esters and dithiocarbamates, hold a 12 % share, primarily in heavy‑duty industrial oils where extreme oxidative environments exist. Organophosphate inhibitors, valued for their film‑forming capability, account for 10 % and are prevalent in aerospace and marine applications. Metal‑based inhibitors, such as zinc dialkyldithiophosphate, represent the remaining 8 %, often blended to meet specific anti‑corrosion specifications. This type‑based taxonomy clarifies how chemical functionality drives pricing, adoption rates, and ultimately the overall Oxidation Inhibitors market size.