3.0 has some different stuff, and there are no problems with them so far.
3.6 timing chain problem is not tied to any one car. When I was at a GM Customer Service meeting in Detroit, we talked about it. The head Tech guy was in the room, and he said that its funny that its not all of them, and not any one car, so it seems to be sparatic. They have fixes, and they have since put thoes fixes into production.
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2/20/2013: They Day the ****s Stopped
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