I am going to say it is a coincidence based on what has been posted on this and other forums for the past 5 or 6 years...there were some engines in 07 and 08 that were assembled in Mexico that had a ring problem, but only a few of those from the ratio of posts. The problems you list are discussed, but not all on one vehicle! Sounds like you got a couple of real lemons and not typical IMO.
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08 JK 23S - Colorado Jeep Club No. 204
Too much to list - see my profile for details on build
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I do not consider myself a smartass. I point out the obvious, search for the truth, and speak fluent sarcasm. I am, by experience, an accomplished curmudgeon.