is this alarming

Its allways best to take eng. problems to the eng. shop that makes the motor not the shop that makes the truck. a cumm. eng shop can run the problem thru and give you a idea how long before over/haul will be needed?

 

If you’ve been doing really short hauls like less than 60 miles and tons of off and on runs that don’t allow for your oil to hold operating temperature for long time it could just be moisture in your oil that doesn’t get worked out. But if you got that after a 3 day long haul drive and the oil stick looks similar than yeah you got coolant going into the oil.

 

That's condensation which is a possible sign of a blockage within the crank case ventilation system.

For what it is worth, it also can be a problem when the engine doesn't warm up and run hot. I've seen this in some used junk trucks that the owners took out the thermostat or it was stuck open.

 

The slim is signs of moisture. Weither its coolant or just water needs to be determined. Oil sample is a good idea.

I have notice this more now on engines, cars included. The PVC that drained to the atmosphere also drained water. Heat and cooling causes condensation. Now with a closed system it has no place to go. I see the need on newer cars to change the oil sooner, than later because of this. To much moisture and you can have a freeze up in the pvc. Then you start a very cold engine and increase rpm before complete warm up, bang, no place for pressure to go and it will push oil seals out.

Sorry so long. If oil samples dont show coolant, shorten your oil change intervals.