Re: Hemi spark plug change interval?
around $64 for the OEM plugs ordered online, about an hour or so of your time and change the plugs every 30-32k miles on the Hemi.
Oh, and you need 16 of them! Put the OEM copper plugs in - no reason to spend the $$$ for anything else when you have to change them every 32k miles. And no real improvement in performance gain with platinum plugs etc.
2013 Jeep Wrangler Unlimited - V6, Billet
2011 Jeep Grand Cherokee Limited - V8, Silver
2011 Coleman E3 Evolution camper, Gray
2014 KTM 690 Enduro r - Orange (of course)