What Causes Water in Engine Oil?

1 Answers
StSophie
07/30/25 2:55am
There are several reasons for water presence in engine oil: Leaking engine water plug: Corrosion from scale can cause the water plug to rust through, allowing coolant to enter the oil passages from the water jacket until it reaches the oil pan. This is a common cause, so regular inspection of water plugs is essential. Damaged oil cooler: If the oil cooler's pipes are damaged, external water from the cooling system can seep into the oil cooler, leading to water contamination in the engine oil. Damaged cylinder liner seal: A faulty cylinder liner seal is another frequent cause of water in engine oil. When troubleshooting, always check the condition of the cylinder liner seals.
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