Possible water on oil filler cap and oil filler neck

[Nikola718]

My 2000 Expedetion has what looks like water mixed with oil on the bottom of the oil filler cap and around the oil filler neck. I changed oil last week and it went away for the week but I noticed it was back again this morning. I checked the dip stick and there is no sign of oil/water mixed on it and when I drained the oil, there was no sign of water in the pan. The oil level has not increased nor has the radiator level from what I can tell. I had someone run a blown head gasket check with the special testing tools and it came back as inconclusive. Has anyone seen this before on their truck?

 

[bedrck46]

when you run the expy are you running it on longer trips or shorter trips You may not be allowing the engine to heat up enough to evaporate any moisture buildup

 

[Nikola718]

Thanks for the reply. I just realized that when I checked it, I had been driving it and there was no sign of moisture. I noticed the moisture this morning before starting it. I will warm it up tomorrow and check again.

 

[bedrck46]

most likely condensation as I guess you are having cold nighttime temps in your area aw well

 

[alaskanexpy]

in the winter time i get a residue just like that, short trips combined with low temps dont help any.

 

[tonydiv]

Back in the good old days, when engines had crankcase vents that actually vented to the atmosphere, this problem didn't exist. Now, for environmental reasons, engines are pretty well sealed up and that moisture from condensation has no place to go. Short trips in cold weather can make it worse, but it's nothing to worry about.