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Thread: New spark plugs needed at 100K miles?

  1. #1
    Grasshopper
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    New spark plugs needed at 100K miles?

    I have a '14 SXT V6 that just hit 97K miles. Scheduled maintenance has been done according to the intervals in the back of the owner's manual, with oil changes done a bit more frequently every 6K miles.

    Engine is running smooth and fuel consumption is normal. Any reason to change plugs at 100K miles? I understand the need to change fluids on schedule, but is there any issue waiting on spark plugs? I fully intend to keep this vehicle for 200-250K miles. I just don't want to fix something that isn't broke. I am tempted to wait until around 125K miles, hoping to only change plugs once during my ownership of this vehicle. Is that reasonable or am I inviting bigger problems?

    Thanks.
    D'Rango likes this.

  2. #2
    Durango Jedi Don Fox's Avatar
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    Kevin:
    It seems you have maintained your Durango in good fashion. The plugs in use these days (iridium, platinum, etc) are pretty resilient. Unless your application includes gobs of idle hours, I wager you will be fine to the 125K mark. Others who have Gen 3 D's with the V6 will chime in with their experience. I ran the Champion Coppers in my 04 Hemi to 50K without issue. Since they are a whopping $2 each, I figured 20K over spec was a good time to swap them.

    Don
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    de N8ECH

  3. #3
    Durango Jedi
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    You probably can stretch it...but note spark plugs are a wear item and should one start to fail you'll end up with a mis-fire. To me not worth it especially with factory plugs installed.
    But really the reason to replace at 100K is to make sure they don't get frozen in the head which can happen seeing the heads are aluminum and spark plugs are steel.

    What I'd do is remove one and check it. Or you could just have them replaced and ask that you get the old ones back, then check them. If they still look good, then run the next set longer.
    Oh, I'd go with Iridium replacements for the stock "I believe" platinum plugs too.

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  5. #4
    Grasshopper
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    Honestly for $100 that is cheap maintenance. Yes i would imagine and even assume you could go 20-30% more miles on those plugs without issue, but in the life of the car you are saving MAYBE $300. To me this is a definite preventative maintenance that is cheap and worth it. Plugs are easy to swap and a good set will cost around $100. I say just replace them and be done with it.
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  6. #5
    Durango Jedi
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    It is a bit more involved on the Pentastar...I believe it requires removal of the upper intake manifold.
    Hemi is a piece of cake in comparison.
    Moose135 likes this.

  7. #6
    Grasshopper
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    I appreciate the comments. I could risk an occasional misfire until putting new spark plugs in, but having them frozen sounds like a much bigger concern. I found a "how-to" write-up online, the intake plenum does need to be removed and that is probably over my meager wrenching skills, so I will have my independent mechanic change the plugs at the next oil change.

    Thanks again,

    Kevin

  8. #7
    Grasshopper
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    At least with the 14 and newer Hemi's it's 100,000 miles, not 30,000. Dodge recommended changing the plugs every 30,000 miles on my 2013.

  9. #8
    Durango Jedi
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    Thus the effect of going from Copper plugs in your '13 to Platinum plugs in the '14 and up models.

  10. #9
    Durango Jedi Skippy426's Avatar
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    Quote Originally Posted by Chase300 View Post
    Thus the effect of going from Copper plugs in your '13 to Platinum plugs in the '14 and up models.
    The Pentastar V6 always had long life plugs, the 5.7 was the one that made the switch.


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  11. #10
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    With Pentastar V6, if you are going to all the trouble of removing the upper half of the intake manifold to replace the spark plugs (make sure to replace them with the stock long life Iridium plugs) you might as well look into changing the COP's (ignition coils) too, as well as the oil cooler (which tends to develop a crack/leak by about 100K miles). That way you only pay for the labor or spend your own time on this job once. Don't forget to replace those intake manifold gaskets/seals/O-rings when you put the intake manifold back together so you don't develop a vacuum leak later.
    D'Rango likes this.

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