Proper, modern Re-refining with careful feed and product quality control, as well as sophisticated processes can successfully treat used motor oil to remove impurities so that it can be used as base stock for new lubricating oil. In other words, with good design and process management the used oil can be re-refined into "new" oil, giving it a second life so it can be used for vehicle motor oil again.
Currently 14% of used motor oil is re-refined and the consumer demand for this product has not made re-refining economically efficient for oil manufacturers. The result is that in some cases re-refined motor oil may be more expensive than virgin motor oil, When purchasing re-refined motor oil make sure that the oil specifications for the product meet those required by your vehicle manufacturer.
In some industries, oil is filtered through a commercial filtration system or otherwise cleaned. This process helps remove insoluble impurities so the oil potentially can be used again and again. Although the cleaning process does not always bring the oil back to its original quality, such cleaning, when combined with replenishment of key additives, does extend the oil's life and use.
Re-Use and Reprocessing
Both lubricants, such as motor oil, and fuels, such as heating oil, are petroleum products. When an oil can no longer perform its original lubrication job, it may be perfectly suitable for Re-use and a second life as a fuel petroleum product in, say, a power plant with little or no treatment. If some treatment is needed, reprocessing of used motor oil removes some water and particles so that the oil can be burned and used as fuel to generate heat or electricity for commercial operations. 74% of all oil re-use/recycling in the U.S. is for burning in turbines, incinerators, power plants, cement kilns and manufacturing facilities (asphalt, steel, etc...). An additional 11% of used motor oil is burned in specifically designed industrial space heaters. This creates a valuable form of energy, which helps our economy by avoiding the need to refine new commercial heating oil from imported crude oil.
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