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Properly functioning stern tube seals will keep the oil inside the stern tube and water outside the system.

Properly functioning stern tube seals will keep the oil inside the stern tube and water outside the system.

But under certain conditions a little oil consumption or water ingress may occur.
Big fluctuations in water pressure on the AFT seals can be a reason for this.
Below video clearly shows how these fluctuations in pressure can occur. One moment the complete stern tube is out of the water, the next moment it is 5 to 6 meters below the surface.