Originally Posted by NYC F-350
Ok. so I freely admit I F...ed up on this one. Here I was off doing some work when a little voice in my head says "Hey, idiot! He was talking about a chalky white substance around his degas bottle cap and not the white goop that oil/coolant make!"
Listen, If you see this, you need a new degas bottle cap. Throw the old one out and clean the chalky stuff off. Drive the truck and if it happens again, there is a test to determine if it is a failed EGR cooler. BUT, whenever you replace an EGR cooler, you replace the oil cooler as well. The oil cooler clogs in the coolant passages which robs the EGR cooler of coolant flow and that is why the EGR cooler fails.
My apologies for my brain-fart moment of the week.
Wow, I didn't even notice that until your post made me re-read the thread title!
Well, that makes two of us in the "brain fart" boat. Pass the popcorn because this is gonna get good. We'll see how many others get in the boat with us...
PS. To the OP, both posts are great advice, and please keep us posted.