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If it is coolant - test the oil for glycols
If it is seawater - test the oil for free chloride.
Seawater can be taken up by the engine through air intake, which seems likely in your case since there is no evidence for coolant or direct seawater intrusion. It only takes a small amount of spray in the air to turn into salts in oil. Have you checked your fuel tank for seawater intrusion?
In any case, the concentration of salts in oil has to be compared to a benchmark set for engines operating in marine environment.
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