Spark Plugs??? What does every one use in their 5.7 Hemi?

Discussion in 'Dodge Challenger General Discussions' started by ZEN357, Jun 17, 2019.

  1. ZEN357

    ZEN357 Full Access Member

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    So this isn't a Challenger related question but a 5.7 Hemi related question. I own a 2006 300C Heritage model. I was my late fathers and plan to hang on to it. He had the plugs changed at 35,000 miles with the standard copper ones the dealership put in for him. Now it's got 86,000 miles on it and I really don't want to do this again after another 35,000 miles. So my question is this..... Iridiums? E3 Diamond Fire? or regular copper plugs and change them again every 35,000 miles like the owners manual says? Can I get some input from anyone who has swapped out their spark plugs? Thanks!

    https://www.jegs.com/i/E3-Spark-Plugs/368/E3.66/10002/-1?ymm=4294829862+4294829029+4294829028

    https://www.jegs.com/i/Autolite/417/XP5263/10002/-1?ymm=4294829862+4294829029+4294829028

    https://shop.advanceautoparts.com/p...3-P?navigationPath=L1*14923|L2*15034|L3*16071
     
  2. 2010RT

    2010RT Full Access Member

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    I too am curious on what its like to change the plugs on my 5.7. Is there a special socket to reach down in there?
     
  3. 70-426_10-SRT

    70-426_10-SRT Full Access Member

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    Have to see if I can find the picture of the plugs I pulled from my Wife's 2006 5.7 Jeep we bought new.

    Factory, Regular Copper Champion plugs with 147k miles on them.
    And other than the Gap about 1/3 over that it calls for were still running great. Did show a couple Mis-Fires on Cyl-8 so I changed them.
    The kid at the parts counter was really pushing the Iridiums he had on sale for $12 ea (x16 = $192)
    Told him I wanted to try to get another 140k miles out of $2.05 Champion's (16x=$32.80)
     
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  4. 70-426_10-SRT

    70-426_10-SRT Full Access Member

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    Standard socket with rubber insert works fine. with LONG Extention
     
  5. ZEN357

    ZEN357 Full Access Member

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    Thanks for the input. I noticed that at the auto parts store the last time I bought plugs for a vehicle. The kid was really pushing the iridiums. I think I will probably stick with the copper plugs.
     
  6. IntimidatorRT

    IntimidatorRT Well-Known Member Staff Member Super Moderator

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  7. 70-426_10-SRT

    70-426_10-SRT Full Access Member

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  8. IntimidatorRT

    IntimidatorRT Well-Known Member Staff Member Super Moderator

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    If you look in your owners manual, it’s only the 5.7 that the service change on plugs , the SRT 6.1 is over 100,000 miles on a plug change... I only put about 5,000 mile s a year on mine so every 6 years I don’t mind.


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  9. 70-426_10-SRT

    70-426_10-SRT Full Access Member

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    Here is a pic of those plugs out of my wife's 5.7 at 143k miles

    I pulled the plugs out of my V10 at 60k and just regapped them
    then changed them at 100k but were clean & still running fine.

    jeep-57-sparkplugs-140k.jpg
     
  10. ZEN357

    ZEN357 Full Access Member

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    Okay, so not that I'm arguing or disputing anything that you guys are saying but I want to ask this. Why not iridiums? Is there something about the 5.7 Hemi engine that doesn't like them? I have read good and bad about the issue. Just wondering your opinions.