Octadecyl sulfide is widely used as a lubricant additive to enhance the performance of oils and greases. It reduces friction and wear in mechanical systems, extending the lifespan of machinery components. In the polymer industry, it serves as a processing aid, improving the flow and mold release properties of plastics during manufacturing. Additionally, it is employed in the formulation of corrosion inhibitors, protecting metal surfaces from degradation in harsh environments. Its hydrophobic properties make it suitable for use in coatings and surface treatments to impart water repellency to materials.