7.4L expelling fuel/oil out exhaust creates sheen on water

[Triniborn]

Happy that you’ve finally found your issue.

Now many oil changes have you done? I probably did around 5 when I had my oil coiler leak. Sat at the dock with the engine running to get everything up to temp and the oil nice and hot. Then drained, changed the filter, filled her up - and repeat. I could have gotten away with less, but an oil change is far cheaper compared to replacing an engine.

Get yourself a 5 gallon bucket of oil (or maybe two) and several cheap fram filters, and 1 good final filter.

One last note - buy one more oil cooler, you’ve got another engine sitting over there. Also add trans coolers to your list for next year.

Thanks, I bought 5 gallons of oil and three filters to do exactly that. Also, as concluded above I’ve ordered new oil coolers and transmission coolers for both my starboard and port engines. I will also be looking to replace my fuel coolers and heat exchangers soon. I will update the thread on the sheen once I give the exhaust hoses sometime to get rid of any oil residue.

 

[mrsrobinson]

PROGRESS UPDATE: It was a bad oil cooler after all. TBD if sheen will go away once cooler is replaced.

Now this wasn’t simple as it should have been and I’ll take some of the blame; however, I want to share my story from the beginning to help other boaters.

Excellent follow-up/documentation, thanks.

 

[Korkie]

I had mentioned that the oil cooler was the culprit back in post #11 as I had just repaired ours. It is the most common cause. Happy to see you got it worked out. No worries, your sheen will eventually go away. As water and oil do not mix well, it may take some time.