Today I changed the oil in my parents' 2000 Duratec. When I removed the oil cap, I noticed some watery oil gunk up inside the cap. So then I removed the breather tube that comes out of the front valve cover and it was gunked up too. There was no water in the oil, so I'm not too worried, but I thought I remember someone else who had this happen though and it was a clogged PCV valve. Or maybe the moisture in the engine just didn't have enough time to evaporate? I don't know. The car has 21,000 miles. What do you guys think?