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Spark Plug recommendation

Discussion in '2nd Gen. Tacomas (2005-2015)' started by TacoSR52010, Apr 25, 2022.

  1. Apr 25, 2022 at 6:29 AM
    #1
    TacoSR52010

    TacoSR52010 [OP] Active Member

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    I’m looking at replacing my spark plugs and was thinking on Denso Iridium…are they worth the cost or should I stick with the regular factory plugs for 1/3 of the cost?
    I’ve only had the plugs changed once and I currently have 130,000 miles on the truck.
     
  2. Apr 25, 2022 at 6:32 AM
    #2
    guyfromky

    guyfromky Well-Known Member

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    Denso copper.
     
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  3. Apr 25, 2022 at 6:34 AM
    #3
    Clearwater Bill

    Clearwater Bill Never answer an anonymous letter

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  4. Apr 25, 2022 at 6:34 AM
    #4
    guyfromky

    guyfromky Well-Known Member

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    Which is 3 Denso and 3 NGK lol
     
  5. Apr 25, 2022 at 6:38 AM
    #5
    XSplicer62

    XSplicer62 Well-Known Member

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    BallisticTaco and Not a golfer like this.
  6. Apr 25, 2022 at 6:55 AM
    #6
    TacoSR52010

    TacoSR52010 [OP] Active Member

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    3 Denso and 3 NGK…is that still recommended? I wonder why the mix of the two.
     
  7. Apr 25, 2022 at 7:02 AM
    #7
    TS4x4

    TS4x4 Well-Known Member

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    Stock. Some will say that platinum-sparkle-unicorn plugs help MPG and HP but they're talking out their rears.
     
    Last edited: Apr 25, 2022
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  8. Apr 25, 2022 at 7:03 AM
    #8
    Hook78

    Hook78 Well-Known Member

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    The iridium proponents don’t typically say that, they say the plugs last longer than copper.
     
    Last edited: Apr 25, 2022
  9. Apr 25, 2022 at 7:14 AM
    #9
    guyfromky

    guyfromky Well-Known Member

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    Just pick one or the other. Denso is the more popular choice. Stick to copper. Rumor has it that Toyota had an agreement/contract with both Denso and NGK so used 3 of each. Another theory is that one side of the engine requires a meniscal amount of less resistance. They are all just theories. At the end of the day, we may never know and it doesn't really matter.
     
  10. Apr 25, 2022 at 7:47 AM
    #10
    tacoman45

    tacoman45 Well-Known Member

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    Copper plugs are at a different heat level than Iridiums. Folks who swap out the coppers for iridiums have mixed results. The copper Denso plugs are super cheap, just use those.
     
    TacoSR52010[OP] likes this.
  11. Apr 25, 2022 at 8:23 AM
    #11
    steveo27

    steveo27 Ask me about my weiner

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    The same shit everyone else has.
  12. Apr 25, 2022 at 8:50 AM
    #12
    Saffa

    Saffa Well-Known Member

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    According to Wikipedia

    "After becoming independent from Toyota Motor, the company was founded as Nippon Denso Co. Ltd. in 1949. About 25% of the company is owned by Toyota. Despite being a part of the Toyota Group of companies, as of the year ending March 2016, sales to the Toyota Group accounted for less than 50% of total revenue (44% of revenue originated from other car manufacturers in Japan, Germany, the U.S. and China)"
     
  13. Apr 25, 2022 at 8:53 AM
    #13
    Saffa

    Saffa Well-Known Member

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    I replaced my 2008's with Iridiums and had no problems, the only benefit is longer replacement intervals
     
  14. Apr 25, 2022 at 8:58 AM
    #14
    10thMTNgrunt

    10thMTNgrunt This is the way, step inside.

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  15. Apr 25, 2022 at 9:09 AM
    #15
    Hook78

    Hook78 Well-Known Member

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    Exactly. Meant to say “last longer”.
     
    TacoSR52010[OP] likes this.
  16. Apr 25, 2022 at 9:15 AM
    #16
    Saffa

    Saffa Well-Known Member

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    I think they are all the same heat range

    I did a part search on the NGK site for my 2015 truck and all the plugs suggested were heat range 6


    LFR6C-11 V-Power Spark Plug Heat Range 6

    FR6AIX-11 Iridium IX Spark Plug Heat Range 6

    LFR6AHX-S Ruthenium HX Plug Heat Range 6

    I replaced the plugs on my 2015 with Rutheniums a week ago, I couldn't find Iridiums.
     
    Last edited: Apr 27, 2022
    tacoman45[QUOTED] likes this.
  17. Apr 25, 2022 at 9:20 AM
    #17
    Hook78

    Hook78 Well-Known Member

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    There’s been some conversation on TW in the past on this, and the experienced folks said that all the plugs are copper-based primarily, the iridiums just have a coating at the electrode. So that would explain the same heat ranges all around.
     
  18. Apr 25, 2022 at 9:23 AM
    #18
    Robnik

    Robnik Disciplined Maniac

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    Iridium is only referring to the central electrode. They can last 100,000 miles. Copper you'll be changing more often. Go with what you can afford. Denso or NGK, they're both about the same. I tend to use NGK's since they are properly gapped out the box & I've been using them for decades.
     
  19. Apr 25, 2022 at 9:27 AM
    #19
    Saffa

    Saffa Well-Known Member

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    You are right, the cores are all copper, the tips are different metals


    Iridium
    upload_2022-4-25_9-23-55.jpg

    V-Power
    upload_2022-4-25_9-25-35.jpg
     
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  20. Apr 25, 2022 at 9:32 AM
    #20
    Saffa

    Saffa Well-Known Member

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    I've used NGK Iridium X with my 2008 and this time I installed NGK Rutheniums, I only use NGK and maybe Bosch if I can't get NGK.
     

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