The lubricant industry is one of the key industries supporting the world's industrial, transportation and manufacturing infrastructure. In the meantime, base oil, as the main ingredient of lubricants, plays a decisive role in the quality, performance and sustainability of the final products. With increasing environmental concerns, limited crude oil resources and rising production costs, the use of recycled base oils as a smart and sustainable solution has received more and more attention than ever before. Recycled base oil is the result of refining and refining used oils that have lost their original properties due to use in automotive engines, industrial machinery and hydraulic systems. Instead of becoming hazardous environmental waste, these oils are returned to the production cycle using purification technologies. The recycling process includes the removal of contaminants, heavy metals, oxidized materials and degraded additives, which results in the production of base oils of acceptable quality for industrial and even export uses. One of the most important benefits of recycled base oils is the reduction of their environmental impact. Waste oil can severely contaminate soil and water resources if disposed of improperly. Proper recycling of these oils not only prevents pollution, but also reduces the consumption of natural resources. This is doubly important in the context of sustainable development and ESG (Environment, Social Responsibility and Corporate Governance) concepts. From an economic perspective, recycled base oils are a cost-effective option for lubricant manufacturers. Reducing dependence on virgin base oil and greater stability in raw material supply helps companies to operate more sustainably in the face of fluctuations in the global oil market. In addition, the quality of today's advanced recycled oils has reached a level where, in many applications, they are fully competitive with Group I base oils. Companies such as Karen Pashran Novin Refining, focusing on the production of recycled base oils in various grades such as SN150, SN350 and SN500, play an important role in the development of this sector of the industry. The use of technical knowledge, strict quality control and an export-oriented approach has enabled the recycled oils produced to meet the needs of domestic and international markets. Ultimately, the future of the lubricant industry is directly tied to concepts such as resource efficiency, environmental protection and innovation. Recycled base oils are not an alternative choice, but a strategic necessity for the modern lubricant industry; a necessity that leading companies have invested in today.