What are the causes of water entering the Cummins engine oil?

[StLillian]

Cummins engine oil water ingress causes are as follows: Oil cooler damage: If the oil cooler is damaged and the cooler pipes are broken, external water from the cooler can seep into the oil cooler, leading to water mixing with the oil. Engine water plug leakage: Engine water plug leakage occurs when, after several years of engine use, some water plugs rust through due to scale corrosion, allowing coolant to enter the oil passage from the water passage and drain into the oil pan. This situation is quite common, so regular inspection of water plugs is necessary. Cylinder liner seal damage: Wet cylinder liners are in direct contact with coolant, and the seals at the lower part of the cylinder liners effectively prevent oil and coolant leakage. During use, these seals endure certain pressures, and sometimes poor coolant quality causes corrosion. After prolonged engine operation, the seals are prone to failure.