A huge amount of used lubricating oils are produced worldwide. The different sources of used lubricating oils are railway workshops, industries, ship garages, defense machinery, automobiles workshops, etc. All types of lubricating oils in service in automobiles and process industries become contaminated and lose their performance due to changes in some of their properties. Therefore, such oils must be removed as used oil from the service as frequently as necessary. How to handle and what to do with the used lubricating oils are serious concerns to environmentalists, governments, industries and research scientists. Used lubricating oil disposal techniques of the past such as land filling, road oiling, and track side foliage control, indiscriminate dumping, burning for energy, etc., create serious environmental problems. Many of these disposal techniques are severely restricted by current state and federal environmental regulations 1. The common disposal technique of used lubricating oil is burning for generation of energy. Burning and all other routes of disposals of used lubricating oils are uneconomical and result

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Huge amounts of used lubricating oils from automotive sources are disposed of as a harmful waste into the environment. For this reason, means to recover and reuse these wastes need to be found. Valuable lubricant could be recovered from disposed oil. More importantly, oil may be the most important factor to influence the shape of society in the 21 st century. This paper discusses the regeneration of used lubricating oils.