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Old 10-05-2019, 10:52 PM   #21
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City: hawaii
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The fact that the oil and water are not mixed is a big clue, pretty much eliminates the raw water system as a suspect. (Unless, as mentioned above, the motor lives below the waterline)
For my $.02 worth, How about a bilge pump failure or a delayed startup of same?
The ER could have flooded, with a sticky float switch kicking in late.
The water could have then entered through the dipstick port.
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Old 10-12-2019, 06:03 AM   #22
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Air pressure test

The ONLY other possibility is cracked block -doubtful. Air pressure test it will locate the leak (my guess is the inter cooler)
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