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Hey Guys,
I’m up for a spark plug change next week, and I wanted to see what other charger owners are using for plugs. What’s the best plug for performance and price? Or does it really even matter?
 

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Although Ive yet to accumulate the miles to change plugs on any of my LX's, from what i recall, the 5.7's are good for 30k and should use the OEM copper (Champion?); others i've read use the iridium tipped ones for longer intervals, but i'd stick with the OEM's for the copper conductivity properties...
 

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I had well over 120K miles on my '07 when I traded her. I changed the plugs myself each time and each time out back the OEM Champion Copper Plus plugs. Never had an issue... Just don't forget the dielectric grease and anti seize.
 

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I have put NGK Iridium plugs in everything since Y2K. I will not use another plug, they are great, I would use them even if the service interval was not increased. I have noticed a positive difference in every car I have put them in. I view the extra cost to be irrelevant, I paid $106 for 16, $70 extra broken down over several years, big deal. If you run them just twice as long as copper, cut that number in half.
 

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Sure I'd like to run Iridium.. But at the amount they cost X 16 i'll stick with the OEM Copper. I think I paid $36 bucks for all 16.
 

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Do a search.... Some people have replaced their copper plugs with iridium, plats, and misc other plugs. Some have no issues, but others have reported throwing various codes. Ultimately it's up to you. I may be one if those last few crazy people out there (at least I know I'm the only one where I work) that actually enjoys doing such things to my car(s). Plus, I know it was done correctly. The last time I changed the plugs in my '07, I got them from Advanced Auto for $32 total with free shipping.
 

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The general consensus I've seen on two different forums is that the copper Champions are the best for the Hemi's. :bigthumb:
 

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Any specific reason coppers are better? Or is it just the cost/benefit ratio is best? I never would have gotten Iridiums at full price, I figured at the sale price they were worth it
 

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Any specific reason coppers are better? Or is it just the cost/benefit ratio is best? I never would have gotten Iridiums at full price, I figured at the sale price they were worth it
Conductive properties of copper
 

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Testing done by hard-core drag-racers, serious modders, and others more smarterer than I is! :)
I've been pretty active on here and LXF for a while now, and I'm just passing along what I've read over the years. :beerchug:
 

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I'm sure you have done much more homework on this issue than I... 30,000 miles from now I'll take your advice and go with coppers
 

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Been running the iridiums for 32k miles (62k miles on the car) . Pulled a few of the plugs looked like new...put them back in.

I'll check them again at 90k.
 

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But do you really need to change the plugs every 30k miles? I just traded in my 2012 SXT for a 2014 R/T last week. I asked the service advisor at the dealership if there was a difference in maintenance between the six and the eight cylinder engine and he said to change the plugs every 30k (dealership wants $249.95). But the owners manual recommends changing the plugs for the 5.7 at 100k????
 

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I have Autolite APP104 double platinum spark plug for my 5.7 Hemi. This spark plug is definitely improved your performance and fuel efficiency. This spark plug needs less voltage for a smooth start. It has a copper core electrodes for better performance.
 

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Copper plugs barely make it 30K miles before wearing down the gap. The Mopar plugs are good for 100K miles, not cheap but you usually get what you pay for.
 

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It has a copper core electrodes
The core is copper ... the electrodes are plated with a different metal (nickel, platinum, iridium, etc...). Depending on the model year of the 5.7L the spec plugs are either copper/nickel (change every 30K miles) or the platinum plugs (change every 100K miles).
.
 
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