The high level of reliability of newer cars has many people forgetting to properly maintain them. Yes, the plugs in the 5.7 HEMI motors may last longer than the recommended interval, but changing them is cheap insurance. Pulling plugs from aluminum heads after THREE TIMES THE FACTORY RECOMMENDED MILEAGE isn't smart. The chance of tearing the aluminum threads increases dramatically.
I have a 2007 Ram that developed a shudder that turned out to be a failing lifter to a cylinder controlled my the MDS system. Stuff like that doesnt show up on any code reader. My truck required removal of one cylinder head, removal of one piston and rod, honing of the cylinder and replacement of the dead lifter. That came to $3800. There was no culpability on my part. It was simply a defective part that gave out. The NON Chrysler warranty company tried to deny the claim because I didnt keep accurate oil change records. This was despite the fact that the problem was totally unrelated to the oil.