Used Oil, often referred to as waste oil, is oil that has been used in engines, machinery, or other equipment and has become contaminated with impurities such as metal particles, dirt, and chemicals.When oil is used, it degrades and collects contaminants, making it less effective for lubrication purposes. Recycling and re-refining used lubricant oil is crucial for environmental protection and resource conservation. The process involves removing water and impurities, distilling to separate different components, and adding new additives to restore the oil's properties. Proper recycling prevents environmental pollution.