What Causes Engine Oil to Turn Milky White?
2 Answers
This phenomenon is caused by water contamination leading to oil emulsification. Emulsified oil significantly loses its film strength and can no longer meet the engine's lubrication requirements. Immediate oil change is recommended. The primary cause of engine oil emulsification is coolant leakage from the radiator into the oil pan. Check the engine cylinder cooling system for cracks. Preventive measures for oil emulsification: 1. Warm up the engine: Always warm up your vehicle before driving, and use engine oil suitable for your vehicle. 2. Regular inspection: Frequently check components like the air filter, especially in northern regions and humid areas. 3. Air filter bypass: Route the engine's blow-by tube directly to the atmosphere instead of connecting it to the air filter (ensure the air filter port is sealed). The blow-by tube opening should face downward and be securely fixed to prevent blockage and water ingress during rain.
I've been driving all my life, but recently the engine oil turning milky white has been a real headache. I noticed it during the last oil change—it looked just like milk. This usually happens when water mixes with the oil, which likely indicates an engine problem, such as coolant leaking in. It's especially common in winter with frequent short trips, as the engine doesn't get fully warmed up. Last time I checked, the cylinder head gasket was damaged, allowing water to enter the oil pan. If not fixed, it could lead to serious issues like engine seizure. Better take it to the repair shop ASAP—don't skimp on costs, or engine repairs will be even more expensive. Pay attention to your driving habits: avoid prolonged idling, especially in cold weather, and take a short drive to warm up the oil. It's best to check the oil regularly and address any discoloration immediately. Make it a habit for safety, as older cars can't handle much wear and tear.
