Milky car oil is typically caused by water mixing with the engine oil. This can occur due to several reasons, including condensation buildup in the engine, a blown head gasket allowing coolant to mix with the oil, or driving short distances without allowing the engine to fully warm up, which can lead to water accumulation in the oil system. Additionally, driving through deep water or flooding can also introduce water into the engine. Regardless of the cause, milky oil indicates a serious problem that needs immediate attention to prevent engine damage. Ignoring milky oil can lead to corrosion, reduced lubrication effectiveness, and ultimately engine failure. Therefore, it’s crucial to identify and address the root cause promptly to ensure the longevity and performance of the vehicle.