Grant:
fritz:
..... "but given that the engines still seem to blow up left and right " ......

Seriously?  Any info on cause or nature of the failures?   

Oiling of the valve-train (camshaft and finger-follower interface) is insufficient (lots of wear on cams and valve actuators).  Said to be cured with 2016 3.8L and all 4.0L...

OK, not literally blow-ups, but naturally still highly unsatisfactory for the owner. 
So not a continuation or variation of the con-rod failure story? 


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fritz