The current 3.6 does not suffer the issues of the older ones. I wish this place would let go of that.
The 3.6 in my Colorado has towed my boat, driven us all over the Rocky mountains, and still sounds like a sewing machine at idle, and runs just perfect. One of the smoothest v6's I have ever experienced. It now has 51k miles with the oil being changed by the OLM with full synthetic 5w-40 - whatever is cheapest at the time.