Spark Plug Interval 2015 rt road & track
 

so i have been reading an awful lot about my spark plug interval and even called several dealerships. I've been getting numerous answers...i have a 2015 charger rt road and track, I've have read i can go up to 100000 miles without changing my spark plugs...but i also read that they should be change at 30k, i called the dealership and one said 30k and one said 35k but the manual says 100k i'm very confused and would appreciate any helpful advice. Also I've read that the newer chargers have the iridium spark plugs thus making the intervals at 100k but i also read that they have the copper plugs in them. so which spark plug does my car have and when should i change them? Please Help!

the spark plugs used from factory in the a charger 2015 rt 5.7L are SP143877AA. this is an iridium plug with a service life of 100 000miles. I have seen them run to 100k with no problems. I prefer to change mine out a bit earlier..80k...thinking it would be less stress on the coils but iridium plugs show little plug gap wear even at 100k so its probably a ocd thing. Some people like to get them out before 5 years...for ease of removal.

copper plugs used in other dodge products are 30 000.