Why lubricating oil goes milky?

Lubricating oil can turn milky due to the presence of water contamination, which can occur from condensation, leaks, or coolant intrusion. When water mixes with the oil, it forms an emulsion that appears cloudy or milky. This condition can reduce the oil's lubricating properties and lead to increased wear and damage in engines or machinery if not addressed promptly. Regular monitoring and maintenance are essential to prevent such contamination.