Mopar has a new NGK Iridium 100K mile plug for 5.7L Hemi's.
For those of you who what to go for the extra cash and extend the service interval to 100K miles.
Mopar # SP-143877AA MSRP $17.25 (They come pre-gapped @ .044")
NGK # 1LZFR5E-11
It was developed by Mopar to be used in their "Police Package" 5.7L hemi engines. It's a Iridium plug made by NGK
good for a 100K mile service life, made specifically for Mopars 5.7L Hemi engine. This is the new 100K mile sparkplug Jeep is using in all 2014 WK2 5.7L hemi engines and it can be used in earlier 2011~2013 WK2's.
Price comparison to 30K mile NGK copper plugs, with a 20% discount;
"Old" Copper Mopar #SPLZFR5C-11 List $4.95 Net $3.96 Total for 16... $63.36
"New" Iridium Mopar #SP143877-AA List $17.25 Net $13.80 Total for 16 $220.80