When should I change my spark plugs?

 

DCX says 50K on the OEM copper plugs but for grins check em around 30K.

 

Remember you will need 16 of them ... $$$

 

Here’s some poop on the Plugs. OEM plug swapage for a little over 20 Hemi Bucks.

(Prices from rockauto.com)
Champion Part# RE14MCC4 Copper Plus Plugs (OEM replacement part)
...$1.35 each, 16 for $21.6

Bosch Part # 4314 (two prong, good plugs but for the cost - you be the judge)
... $4.84 each, 16 for $77.44

The gap should be .45 and use anti-seize on the threads, torque to 13 ft-lbs.