India, Jan. 27 -- Hindustan Petroleum Corporation (HPCL) and Castrol India'have signed a Memorandum of Understanding to explore the development of Re-Refined Base Oil (RRBO) ecosystem in India.Under this MoU, the two companies will work together to evaluate a model for collecting used lubricating oil, have it re-refined for its use in lubricant production. The collaboration aims to assess the commercial, operational and technical feasibility of such a circular model at scale. India generates significant volume of used lubricating oil every year, much of which is either under-collected or disposed off informally. International studies show that re-refining used oil can recover up to 70-80% of it as high-quality base oil, while using consider...