I had the same problem and thought it was condensation. ITS NOT TO BE IGNORED!! Im now in the middle of pulling apart the engine because of sludge, possibly caused by a bad pcv valve that cracked and let in air/water. The sludge is almost play-doh consistency. It got so hot from lack of lubrication that one of the bearing caps cracked. I am a former dodge dealer mechanic, and baby my vehicles (maint and dont drive like crazy). I am from FL, but Im stationed in MD and thought it was just because of cold weather. Boy was I wrong!