Changing often means evolving, keeping up with the times. What seemed to be a pioneering activity more than thirty years ago, when the Mandatory Consortium for Used Oils (Consorzio Obbligatorio Oli Usati, COOU) was created, now has become a reality. Indeed, over the last three decades, waste has finally become a resource, as proved by the very COOU data. In 2015, according to the latest COOU’s Green Economy Report, the system’s businesses collected about 166,700 tonnes of used oils, which is almost 43% of the total volume of oil consumption during the same year. Such a percentage nearly equals the maximum hypothetically achievable limit, if we consider that more than half the lubricants are consumed during their use. Collected oils were destined to regeneration aimed ...