Ok, ill try to explain this......

I have a 07 Columbia w/Detroit 60 series 14L......

Ill try to explain this the best way I can........ I checked my oil while fueling today and it seems there was moisture on my dipstick. It was kinda yellowish and was runny....it WAS NOT FUEL! The dipstick didn't smell of fuel either. There was little bubbles in it too.....

Its almost like instead of pouring oil down the tube someone poured water down the tube. I made this observation also....

Left the house sunday...went from charlotte to Dayton Oh, 26klbs I achieved 6.2 mpg which was good and truck pulled great in the mountains...

Delivered in OH and picked up 2 pipes probably 15-18k lbs at the most.....only achieved 5.6 going to corpus Christi TX.....ran empty from there to Houston and only got 6.5 empty.......

Also while going through illinois Monday, I thought I was gelling up(felt just like this) As I was cruising along it just started to stutter for about 5 seconds....scared me. It done it again today.......those are the only 2 times it happened.....

I don't know if the 2 problems are related but, just wondering if anyone had any ideas or maybe this issue

 

Its not coolant, Matter fact ive been checking throughout the day and the yellowish has gone away....?? Moisture is getting into my oil and this mechanic thinks its the(forgot what exactly he called it) tube itself with the dipstick in it.......

 

Oil pressure is the same/coolant level is the same.....I know its not coolant, I went through that last year!!! LOL headgasket/etc......I know the symptoms of that

 

Engine temp runs about 175-180...