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  #11  
Old 07-24-2012, 04:41 PM
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I spoke with my service manager about this and he told me do it every 60,000 miles and from what I understand from others that is about the right time to take care of it.
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  #12  
Old 07-24-2012, 04:49 PM
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The 4.7L and 5.7L use different plugs and follow different schedules...

For the 5.7L:

The same plugs are used in both the intake and exhaust side. I believe they are copper electrode plugs, and require replacing at 30k miles. The copper erodes fast and performance decreases as time goes on.

I've seen some other post about a new setup they are using in the 5.7L that has iridium electrode plugs that are good for 100,000 miles, but not sure if this was police only thing or what. Iridium won't erode as fast so lasts longer.



For the 4.7L:

It uses different plugs on the intake and exhaust sides. The intake side is a yttrium enhanced copper electrode plug. A typical copper plug lasts ~30k miles, but with the yttrium it will last ~50k miles. The exhaust side plug is a yttrium enhanced iridium electrode plug, it will last ~100k miles.



Hope this helps. All that said, I have 63k miles on my 4.7 on original plugs and runs great. I need to change out the upper bank.
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  #13  
Old 07-24-2012, 04:57 PM
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i changed mine somewhere about 40,000 miles
the dealership did it
i of course wanted my old plugs back, i like to see for myself how they are burning
there wasn't a thing wrong with them, good color & wear, nice & dry too
I left home at 67,000 miles, give or take
i now have almost 70,000 on it, the dealership want ed to change them before i left & told him that when i returned back home i would think about it

changing the air filter makes more of a difference
i installed a K&N drop in twice so far, but i do mostly highway miles & i want a clean air filter. The K&N air filters are washable too

on Youtube it shows how to wash them & let them dry out, then lightly spray air filter oil on it before reinstalling

i change my oil & oil filter every 5,000 miles, i use synthetic oil & a quality filter
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Old 07-24-2012, 05:12 PM
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GT, all the hwy miles are probably what help you with your plugs not looking bad. If it was all city the copper would erode faster. The mileage claims are estimates and need to be put into perspective.
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Old 07-26-2012, 07:44 PM
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I just got my truck back from the dealer. I had the exhaust manifold leak. Broken bolts replaced under my lifetime powertrain at 41,000 miles. Service guy recommended a tranny service and spark plugs. I had him put the plugs in...no idea it was going to cost $275 just for plugs and labor. They call it a Hemi tune, but when I asked what else I got in the tune up....nothing else just plugs not even an air filter. $200 in labor $75 for the 16 plugs. WOW
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Old 07-28-2012, 08:58 PM
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Let us know how you make out and please keep us updated.....
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  #17  
Old 09-17-2012, 07:48 PM
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Wow is right FNG!! I took my 2011 to the stealership this morning and they wanted to charge me $275.00 to change out the spark plugs. I told them I'll take my chances, I will perform this task myself.
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  #18  
Old 03-03-2014, 03:33 PM
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Dealer here in Alexandria, VA just quoted me $570 to replace the plugs on my 5.7 at 36k miles. I haven't had any issues with misfires, etc so I'm on the fence whether or not to put it off.
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Old 06-24-2014, 06:02 PM
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I'm now at 36k+ and have no issues. Will likely leave it be until 60K+ unless I start to see an issue.
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