What Causes Water in Diesel Engine Oil?

1 Answers
StChristian
07/30/25 1:08am
Reasons for water in diesel engine oil: 1. Engine water plug leakage, caused by corrosion of scale leading to rust penetration of the water plug. Coolant can enter the oil passage from the water channel and reach the oil pan. This is a common cause, so regular inspection of water plugs is necessary. 2. Oil cooler damage. If the cooler pipes are damaged, external water can seep into the oil cooler, resulting in water contamination of the oil. 3. Cylinder liner cracks. When coolant comes into contact with a working cylinder liner, cracks can easily form. Once cracks occur, coolant can directly enter the cylinder and seep into the oil pan through the cylinder wall, causing the oil to turn white. This leads to poor engine combustion, white smoke, and other issues. 4. Cylinder liner seal damage. A damaged cylinder liner seal is a common cause of water in the oil, so always check the seal's condition during troubleshooting. 5. Cylinder head gasket damage. If the cylinder head gasket is damaged and the water circulation rate is high, water from the water channel can flow into the oil passage, contaminating the oil.
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