Way oil purification is performed by removing contaminants such as dirt, metal particles, and moisture from the oil used in machine tool applications. Filtration is the primary method used, passing the way oil through fine filters to eliminate solid particles. In some cases, vacuum dehydration is also applied to remove moisture from the oil, ensuring that it maintains its lubricating properties and preventing damage to machine components. Regular purification ensures the longevity of way oil and the machinery it protects.