Background: We have a sailboat with a diesel engine. On this engine is a heat exchanger where raw water goes thru some tubes and hot oil goes over the tubes in order to be cooled. We had a failure, and raw water mixed into the oil and got into the engine block. Not good.
The heat exchanger is now repaired, and my husband has done 3 consecutive oil and filter changes, running the engine between changes. He was able to suck out a lot of water the first time, and now he’s left with slightly milky oil - so there’s still some water remaining.
Any suggestions on getting the rest of the water out? Is there something we can add to the oil to break the emulsion? Or do we just keep changing oil till it’s clear?