An oil polishing system is a filtration or purification system used to remove impurities, contaminants, or particulate matter from various types of oils, such as lubricating oil, hydraulic oil, or cooking oil. It helps to extend the lifespan of the oil and maintain its quality, ensuring that machinery operates efficiently or that cooking oil remains safe for consumption. These systems typically use filters, centrifuges, or other methods to separate and remove contaminants from the oil.