Performance Evaluation & Development of Engine Oil with Re-Refined Base Oil for Indian Market

The imperative for sustainability has spurred innovation across industries with a growing emphasis on minimizing environmental impact. In the transportation sector, optimizing engine lubricants emerges as a crucial avenue for achieving sustainable performance as engine oil is the primary lubricants waste stream. Re-Refined Base Oil (RRBO) presents a compelling solution, offering a sustainable alternative to conventional base oils. By reclaiming and recycling used oil, RRBO not only minimizes waste but also embodies the ethos of circularity, promoting resource efficiency and environmental stewardship. This study presents the collaborative efforts between an Indian Automotive OEM and key Lubricant Technology Partner towards the development of engine oil utilizing Re-Refined Base Oil (RRBO) for automotive applications. Specifically, two formulations were targeted: a 5W-30 A5/B5 oil tailored for Bharat Stage IV passenger car usage and a 15W-40 CI4+ oil optimized for Bharat Stage IV commercial vehicle application, both incorporating 10% RRBO. Extensive testing was conducted to assess the physicochemical properties of the base oil and the finished oils containing RRBO. Bench tests were employed to identify key performance parameters, including oxidation resistance, deposit formation, and corrosion susceptibility. Engine-level and vehicle-level testing were performed to evaluate the real-world performance of finished oils with RRBO. The results demonstrate that 10% RRBO-based formulations exhibit performance levels comparable to those formulated with virgin base oil, affirming the viability and efficacy of RRBO as a sustainable alternative. Further on-going testing of the re-refined base stock properties will be required to ensure there is no major deviations in quality. In conclusion, this study highlights the integral role of RRBO in advancing circular economy principles within the automotive industry without sacrificing performance. By embracing resource efficiency and waste reduction, RRBO contributes to a more sustainable and resilient lubrication ecosystem, paving the way for a greener and more responsible future.