Thanks for telling us everything we already knew. Now if you had read through each post...this thread is over a year old and the ops motor threw a rod. His new motor doesn't have issues...
But thanks for playing.
No way genius...
It's a new build. That equals new pistons and rings plus at least a cylinder hone if not a new block. Most people reading this thread I would assume have near or over 100,000 miles on their engine. Over that time period things wear or "break in" thus causing a little bit of blow by when the cylinder bore and pistons are cold. Once they expand the blow by stops, the fact that the OP puked a rod has nothing or very little at best to do with hazing during a cold start, less than freezing at least. Then you throw in that most have deleted or tuned around emissions equipment that was in fact intended to reduce cold weather start up and low temp running emissions. Hazing is a fact of life with diesels that have some service hours on the clock. Not a sign that your about to have a catastrophic failure...