My 3.8 used a little oil until I did my gasket job. During the job I found a lot of oil pooled on the LIM. After replacing the LIM and UIM gaskets, she hasn't used oil since.

FWIW, I used to use a decent amount of oil. Problem was I had bought a Auto Zone brand of PCV valve. Put in a AC Delco PCV a few thousand miles later and slowed it tremendously.