I 've been noticing my oil in my 89 formula 206 looking slightly milky at times. I will go out and drive the boat for a day and it will turn back to a normal looking color for oil. The boat will sit for a week and back to the milky looking oil. Is this a normal condition or could ther possibly be something wrong? I know when the oil looks milky there is a water problem. any ideas thanks

You're probably not getting the engine warm enough to cook off the condensation.

Describe your cooling system. Any non-stock mods? What engine? Do you have an oil temp gauge?

No mods, its a vortec 350. No oil temp gauge either. Could i possibly have aan issue with the cooling system?

My concern is more that you have water intrusion from somewhere. You shouldn't be getting that much moisture in that short of time. If it cooks off from running, your cooling system is probably doing it's job, although a t-stat replacement is a good idea- they don't last forever.

I might be concerned with small amounts of water leaking into the engine. Just a little bit will cook off when running but a leak can put water in the crankcase while it sits. Intakes are tne most common, then head gaskets. Exhausts are notorious for destroying engines but they don't reallt seep int crankcases- just the cylinders. If I were you, I'd pull the exhaust & reseal. I'd do an intake gasket. Make sure on the intake you use a Felpro Marine gasket and follow the instructions. That will at least give you the peace of mind that you're OK. If you remove the intake carefully and look for signs, you may see the leakage point. Don't run the engine prior to removal- you might see the water at the point of leakage. Don't forget to swap that stat while you're in there.

need to get a temp gauge...you would never know till it's to late if you had a serious problem, but sounds like stated before it's running to cold and not getting rid of the mosture, need to get to 160 or so...Rob

I would say that you have a water leak.

Could it be a bad pcv valve or something also. The motor is pretty new. i had the same problem with the older 350 that was in it. There was no t-stat in the old motor but this new one has a new mercruiser one.

I have had water in my oil too with a vortec 350 with thru hull exhaust , the water is entering the exhaust riser outlet. This is with a stock 260 hp merc. cam installed. I have been told that its impossible but my boat still does it.

Oil Temps need to be 200+ to burn off condensation ...If it has stock merc and risers and they are more than 2-3 years old check for leaks ....m

Hey BIG DAddy what state you in ?? and how colds the water ??? We had some condensation on Sunday in 40 degree water and put a restrictor in the thermo housing and should take care of it till we warm up around here ...