Classification of lubricating oils and greases for lubrication and protection of machinery and equipment in manufacturing. Includes liquid lubricants such as engine oil, gear oil, hydraulic oil, cutting oil, and compressor oil, as well as semi-solid lubricants including bearing grease, high-temperature grease, and waterproof grease. Essential consumables responsible for friction reduction, wear prevention, cooling, and rust prevention in machinery, requiring periodic replacement. Used in machine tools, industrial machinery, automotive production lines, and press machinery.