Iridium Ix Spark Plug (ZFR6FIX-11)
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NGK Iridium Ix Spark Plug (ZFR6FIX-11)

Part No. 6441 Warranty Details  

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Laser-welded iridium center electrode is resistant to heat, corrosion and electrical wear. The tapered ground electrode minimizes quenching. Provides outstanding acceleration, high fuel efficiency and durability.

Product Features:
  • 0.6 mm iridium-tip center electrode provides durability and a high melting point
  • Taper-cut ground electrode shape provides improved flame reproduction
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Center Electrode Core Material:Copper Core
Center Electrode Tip Material:Iridium
Electrode Core Material:Iridium
Electrode Tip Material:Iridium
Gap Size:0.044 in
Ground Configuration:Standard
Ground Electrode Core Material:Nickel Core
Ground Electrode Quantity:1
Ground Electrode Tip Design:Taper Cut
Ground Strap Quantity:1
Hex Size:5/8 in
Manufacturer Heat Range:6
Reach:19 mm
Resistor:Yes
Seat Type:Gasket
Shorty Spark Plug:No
Spark Plug Approximate Resistor Value:5K Ohm
Thread Diameter:14 mm
Tip Configuration:Solid
Type:Iridium IX
Wrench Diameter:5/8 in

REVIEW SNAPSHOT®

by PowerReviews
NGKIridium Ix Spark Plug (ZFR6FIX-11)
 
4.8

(based on 19 reviews)

Ratings Distribution

  • 5 Stars

     

    (16)

  • 4 Stars

     

    (3)

  • 3 Stars

     

    (0)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (0)

100%

of respondents would recommend this to a friend.

Pros

  • Easy to install (11)
  • Improves engine efficiency (10)
  • Increases power (9)
  • Durable (6)

Cons

No Cons

Best Uses

  • Everyday driving (13)
  • Replacement (11)
  • Performance driving (8)
  • Restoration (3)
    • Was this a gift?:
    • No (3)
    • Reviewer Profile:
    • Casual driver (7), Auto enthusiast (5), Mechanic (5)

Reviewed by 19 customers

Displaying reviews 1-10

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(1 of 1 customers found this review helpful)

 
5.0

great plugs

By 

from columbia city in.

Verified Buyer

Comments about NGK Iridium Ix Spark Plug (ZFR6FIX-11):

good deal nice plugs

  • Was this a gift?:
  • No

(1 of 1 customers found this review helpful)

 
5.0

High mileage sparkplugs

By 

from Spartanburg, SC

Verified Buyer

Comments about NGK Iridium Ix Spark Plug (ZFR6FIX-11):

I had these plugs previously and put 130,000 miles on them. I changed to new ones, and expect to put over 100,000 miles on them. My car runs great!

  • Was this a gift?:
  • No
 
4.0

simple simple

By 

from Tampa, FL

Verified Buyer

Comments about NGK Iridium Ix Spark Plug (ZFR6FIX-11):

Easy to order easy pickup no muss no fuss

  • Was this a gift?:
  • No
 
5.0

http://shop.advanceautoparts.com/p/ngk-iridium-ix-spark-plug

By 

from Virginia Beach Va

About Me Casual Driver

Verified Buyer

Pros

  • Durable
  • Easy To Install
  • Increases Power
  • Lightweight

Cons

    Best Uses

    • Everyday Driving
    • Replacement

    Comments about NGK Iridium Ix Spark Plug (ZFR6FIX-11):

    These are OEM by Jeep

    (2 of 2 customers found this review helpful)

     
    5.0

    Great spark plugs

    By 

    from Vicksburg, MS

    About Me Mechanic

    See all my reviews

    Ask me a question

    Verified Buyer
    3 or more reviews submitted

    Pros

    • Durable
    • Easy To Install
    • Improves Engine Efficiency
    • Increases Power

    Cons

    • none

    Best Uses

    • Everyday Driving
    • Replacement

    Comments about NGK Iridium Ix Spark Plug (ZFR6FIX-11):

    Plugs are a little expensive but are well worth the money. I use them wherever I can. Last longer than most plugs.

    (2 of 2 customers found this review helpful)

     
    5.0

    Best plugs for a Honda.

    By 

    from Vicksburg, MS

    About Me Auto Enthusiast, Casual Driver, Mechanic, Truck Enthusiast

    See all my reviews

    Ask me a question

    Verified Buyer
    3 or more reviews submitted

    Pros

    • Durable
    • Easy To Install
    • Improves Engine Efficiency
    • Increases Power
    • Last Longer Than Platinum

    Cons

    • none

    Best Uses

    • Everyday Driving
    • Performance Driving
    • Replacement

    Comments about NGK Iridium Ix Spark Plug (ZFR6FIX-11):

    Use these on almost all of my tune up jobs if there is an iridium plug for the vehicle.

    (2 of 2 customers found this review helpful)

     
    5.0

    122,000 mile on them, you bet I'll buy t

    By 

    from Macomb, MI

    About Me Casual Driver

    See all my reviews

    Verified Buyer
    3 or more reviews submitted

    Pros

    • Durable

    Cons

      Best Uses

      • Replacement

      Comments about NGK Iridium Ix Spark Plug (ZFR6FIX-11):

      I replaced a set of these after 122,000 miles. They looked great! You bet I bought them again!

      (0 of 2 customers found this review helpful)

       
      5.0

      big dif in acceleration and ldle!!

      By 

      from nc

      About Me Auto Enthusiast, Competitive Driver, Mechanic

      Pros

      • Durable
      • Easy To Install
      • Improves Engine Efficiency
      • Increases Power
      • Lightweight
      • Nice

      Cons

        Best Uses

        • Everyday Driving
        • Performance Driving
        • Racing
        • Replacement
        • Restoration

        Comments about NGK Iridium Ix Spark Plug (ZFR6FIX-11):

        Good

        (1 of 1 customers found this review helpful)

         
        5.0

        Replacing stock plugs

        By 

        from Bordentown, NJ

        About Me Casual Driver

        See all my reviews

        Verified Buyer
        Helpful Reviewer

        Pros

        • Easy To Install
        • Improves Engine Efficiency
        • Increases Power

        Cons

          Best Uses

          • Everyday Driving
          • Replacement

          Comments about NGK Iridium Ix Spark Plug (ZFR6FIX-11):

          Replaced the wife's stock plugs a little past the recommended 100K, but on a 2005 Honda Civic LX, this was an easy install. I would say there is a noticeable increase in power and acceleration, but I can't comment on any gas mileage difference yet- the car already gets 35+ mpg so we haven't filled up yet to see the change in fuel consumption.

          (3 of 3 customers found this review helpful)

           
          5.0

          great plugs

          By 

          from Rochelle Park NJ

          About Me Mechanic, Truck Enthusiast

          Verified Buyer
          Helpful Reviewer

          Pros

          • Easy To Install
          • Improves Engine Efficiency
          • Increases Power

          Cons

            Best Uses

            • Everyday Driving
            • Performance Driving
            • Replacement
            • Restoration

            Comments about NGK Iridium Ix Spark Plug (ZFR6FIX-11):

            great plugs have not had them in my truck long and i can tell the difference in horse power and can see it in my fuel mileage.

            Displaying reviews 1-10

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            Do you have questions about this product?

             

            Ask a question, get answers from real customers and in-house experts. For further assistance, please review your support options on our Contact Us page.

            7 Questions | 8 Answers
            Displaying questions 1-7
            • Q:

              Will NGK ZFR6FIX-11 fit in Honda HR-V 1999 D16W1 105hp 4x4
              Asked on 4/4/2016 by Boris

              1 answer

              • CUSTOMER CARE

                A:

                Hi Boris, glad to serve you! As i am unable to locate your 1999 Honda HR-V in our online vehicle compatibility chart, I would suggest that you call us at: 1-877-ADVANCE (238-2623) or contact our "Live Chat" support and one of our Parts Pros will gladly assist you with any questions or concerns you may have.

                Answered on 4/5/2016 by Steve from AAP
            • Q:

              Will this spark plug fit Honda civic 92 95 B16A DOHC?
              Asked on 10/21/2013 by chokia

              1 answer

              • CUSTOMER CARE

                A:

                Hi Chokia, this NGK Iridium Ix Spark Plug (ZFR6FIX-11) - Part No. 6441 is an exact fit for 2001-2005 Honda Civic.

                Answered on 10/22/2013 by Morgan from AAP
            • Q:

              are these spark plugs pre gapped
              Asked on 7/20/2013 by mike

              1 answer

              • CUSTOMER CARE

                A:

                With reference to your inquiry on the NGK Iridium Ix Spark Plug (ZFR6FIX-11) - Part No. 6441, all the spark plugs are pre-gapped from the factory, the fact remains that the gap must be adjusted for the vehicle that the spark plug is intended for. Those with modified engines must remember that a modified engine with higher compression or forced induction will typically require a smaller gap settings. For any further assistance please feel free to call us at: 1-877-238-2623 or visit the nearest Advance Auto Parts store and one of our Parts Pros will gladly assist you with any questions or concerns you may have.

                Answered on 7/20/2013 by Morgan from AAP
            • Q:

              I just installed 4 of these spark plugs into my 2005 Honda Civic LX. Approximately how long (how many miles) are these spark plugs meant to last for?
              Asked on 8/28/2012 by Holly from Rochester, NY

              1 answer

              • CUSTOMER CARE

                A:

                The NGK Iridium Ix Spark Plug (ZFR6FIX-11) (Part No. 6441) has a life span of up to 60000 miles. For any further assistance please feel free to call us at: 1-877-238-2623 or visit the nearest Advance Auto store and one of our representatives will gladly assist you with any questions or concerns you may have.

                Answered on 8/28/2012 by John the Car-Doc from AAP
            • Q:

              Is this price for just one plug or a box of plugs? How many in a box?
              Asked on 12/22/2011 by Anonymous

              2 answers

              • CUSTOMER CARE

                A:

                The Iridium IX Spark Plugs from NGK are sold individually. Each Cylinder requires a single spark plug. NGK Iridium IX Spark Plug improves throttle response and superior anti fouling that deliver an outstanding acceleration, high fuel efficiency and durability with its ultimate design, technology and performance.

                Answered on 12/22/2011 by DIY Daniel from AAP
              • A:

                It's only for one plug, but it's def worth the extra money. Best bang for your buck.

                Answered on 3/8/2012 by E from Marietta, Ga
            • Q:

              hello Q will this spark plug help me to save gas or not.
              Asked on 11/30/2011 by MR. G. from muskegon .mi.

              1 answer

              • CUSTOMER CARE

                A:

                A common misconception is that changing spark plugs will result in a large power increase. In most cases, removing even seriously worn out spark plugs will only result in very modest power gains, typically about 1-2% of total engine output. This could be even less for computer-controlled vehicles, primarily because most newer vehicles have more powerful ignition systems and the vehicle's computer can make adjustments so that vehicle operation seems smoother and more seamless.
                Many people think that simply supplying more spark to the firing tip can and will combust more fuel. But most newer cars' engines are efficient enough that they are already burning all of the available fuel. Simply adding more spark voltage can't burn more fuel because there is no more fuel to burn.
                When a stock or near-stock engine is given a fresh set of spark plugs, peak efficiency is restored. The power gains that come from this restored state of tune are usually minimal.

                Answered on 11/30/2011 by Aaron from AAP
            • Q:

              Will NGK ZFR6FGP7100 FIT 2004 hONDA CIVIC dx?
              Asked on 8/6/2011 by Jim from Lake Worth Florida

              1 answer

              • CUSTOMER CARE

                A:

                Yes, this part fits your 2004 Honda Civic DX.

                Answered on 8/7/2011 by Steve from AAP
            Displaying questions 1-7

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