After waiting until 42,000 to change out my spark plugs, the photo of one of the plugs tells a story that the 32,000 OEM interval means something.
Swaped them out with same Mopar NGK plugs. Thank you to member SixZeroFour for an excellent guide.
Thought I would share my findings. This is the worst plug. Most were cleaner but at least 4 of them looked like this.
That actually doesn't look that bad. Nominal wear of the electrode. Color looks decent and there aren't many deposits. Not sure how much the gap grew but that matters little. I would expect that 4 of your plugs are significantly different since those cylinders shut down at times. Then again, it depends on how often you travel highway.
Regardless, I would stick to the 32k.
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Amsoil 5w-20 synthetic meets Chrysler MS-6395 for my Jeep!