Recommended Sparkplugs for the 5.7 Hemi

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...

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.

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.

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.

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.

I just did a spark plug change the the first time (ever) and used Champion Iridium 9403's. I got them for cheap by applying for the rebate they have going on now at https://www.championrebate.com/

I also found this to be very helpful, in case you need it...

http://www.***************/showthread.php?t=82281

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

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

DougieFresh said:

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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Conductive properties of copper

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:

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

Ron380 said:

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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That's what I use. And for the price, I change them every 3rd oil change

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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.

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????

BerthaMintz said:

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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Huh?

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.

BerthaMintz said:

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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CtCarl said:

Huh?

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Based on that statement and this: BerthaMintz methinks we have a spambot.

It has a copper core electrodes

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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).
.

@ post # 21:
Go away please, you spamming troll!!!!!! No one wants or cares about your sales pitch.

Don