^^^ That's what I'm thinking. I've had that deal before, but not at 42K. More like 80-100K, on an old SBC...
However, I've heard some of the 2.0 Mopars had a PCV issue that had similar symptoms.

As far as "that's normal, they all do that"...that's a legendary response.
In fairness, though, the tech needs to have the same conditions to observe a problem.