Di-p-tolylamine is primarily used as an antioxidant and stabilizer in various industrial applications. It is commonly added to lubricants and fuels to prevent oxidation and degradation, thereby extending their shelf life and maintaining performance. In the polymer industry, it serves as a stabilizer for rubber and plastics, protecting them from thermal and oxidative damage during processing and use. Additionally, it is utilized in the production of dyes and organic intermediates, where it acts as a precursor or additive to enhance chemical reactions. Its antioxidant properties also make it suitable for use in certain adhesives and coatings, ensuring durability and resistance to environmental factors.