Oil sheen in exhaust water

[trailshredder]

My port side engine is leaving a sheen of oil on the water at dock while idling. Where do I begin?

 

[Alumarine]

Check fluid levels.
Could be drive oil, engine oil, power trim or power steering.

Might have to pull boat and look for leaks.

 

[bruceb58]

It can also just be unburnt fuel if you are running very rich. Does it do this when the engine is completely warmed up?

 

[harleyman1975]

Easiest thing is to check all fluid levels and look at choke plate on engine to make sure it is opening at same rate as the other engine.

 

[bruceb58]

It could also be as simple as that engine having slightly worn valve guides/seals and you get a slight oil burn on startup which won't be an issue either until down the road.

 

[trailshredder]

It can also just be unburnt fuel if you are running very rich. Does it do this when the engine is completely warmed up?

​Yes, cold or hot, doesn't matter.

 

[trailshredder]

I did check all fluids and all are fine, so far.

 

[bruceb58]

​Yes, cold or hot, doesn't matter.

Run at idle for awhile and pull your plugs and see what they look like.

 

[trailshredder]

This ended up being a leak in my oil cooler. Replaced and all is well.