Emulsified oil is a product made by adding an appropriate amount of anti-rust agent and emulsifier to base oil. It is mixed with water in a certain proportion to form an emulsion. It has anti-rust, cleaning and extreme pressure properties. Performance, suitable for use as a coolant in metal processing, cutting, etc. At the same time, emulsions are harmful to the human body and the environment. Nowadays, very few people use emulsions, and many use water-based ones produced by BMW and other companies. Yes, because water-based products are environmentally friendly and less harmful and polluting.