If you're waiting till that motor breaks, you will be there for a while. Has anyone mentioned the reliability factor here?...probably. It can be a major factor....unless you have real deep pockets or really like working on your car while everyone else is out AXing.
There must be a bunch of folks that have swapped out their 6 to get a 4.....considering all the advantages of the 4 stated here. Step right up, and tell us about it.....like: How much didja get for your used oil tank