IK16 Iridium Power Spark Plug
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Denso IK16 Iridium Power Spark Plug

Part No. 5303 Warranty  

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This spark plug features a small center electrode (0.4 diameter), a tapered tip, a U-groove design and a special iridium alloy (90% Ir) for powerful performance.
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Electrode Core Material:Copper
Electrode Tip Material:0.4mm Iridium
Ground Strap Quantity:1
Insulator Type:Purified Alumina
Manufacturer Heat Range:16
Resistor:Yes
Spark Plug Reach:3/4 in
Spark Plug Seat Type:Gasket
Spark Plug Thread Size:14 mm
Tip Configuration:0.4mm Iridium
Type:Iridium Power
Wrench Diameter:5/8 in

REVIEW SNAPSHOT®

by PowerReviews
DensoIK16 Iridium Power Spark Plug
 
4.9

(based on 7 reviews)

Ratings Distribution

  • 5 Stars

     

    (6)

  • 4 Stars

     

    (1)

  • 3 Stars

     

    (0)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (0)

100%

of respondents would recommend this to a friend.

Pros

  • Easy to install (6)
  • Improves engine efficiency (6)
  • Increases power (6)
  • Durable (4)

Cons

    Best Uses

    • Everyday driving (5)
    • Replacement (5)
    • Performance driving (3)
    • Restoration (3)
      • Car & Truck:
      • Casual driver (4)

    Reviewed by 7 customers

    Sort by

    Displaying reviews 1-7

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    (2 of 5 customers found this review helpful)

     
    5.0

    Great iridium spark plug

    By Sevdog

    from Jackson Michigan

    About Me Mechanic

    Ask me a question

    Verified Buyer
    Level 3

    Pros

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

    Cons

    • none

    Best Uses

    • Everyday Driving
    • Performance Driving
    • Replacement
    • Restoration

    Comments about Denso IK16 Iridium Power Spark Plug:

    These iridium sparkplugs last close to two hundred thousand miles. Great for those Ford aluminun head engines where every sparkplug may be it's last.

    Comment on this review(earn points)

    (4 of 7 customers found this review helpful)

     
    5.0

    great tune up!!

    By 1975nova

    from belmont, NC

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

    Verified Buyer
    Helpful Reviewer

    Pros

    • Easy To Install
    • Improves Engine Efficiency
    • Increases Power
    • Noticeable differance

    Cons

      Best Uses

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

      Comments about Denso IK16 Iridium Power Spark Plug:

      i had doubts, but after installing these denso plugs i have zero regret. love it

      Comment on this review(earn points)

      (3 of 3 customers found this review helpful)

       
      4.0

      seem to work ok so far

      By 48 pre

      from ny

      Verified Buyer
      3 or more reviews submitted

      Pros

      • Easy To Install

      Cons

        Best Uses

        • Performance Driving

        Comments about Denso IK16 Iridium Power Spark Plug:

        easy pick up

        • Car & Truck:
        • Auto Enthusiast

        Comment on this review(earn points)

        (3 of 5 customers found this review helpful)

         
        5.0

        excellent plugs for my Tiburon gs

        By twc64

        from Alabama

        Helpful Reviewer

        Pros

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

        Cons

          Best Uses

            Comments about Denso IK16 Iridium Power Spark Plug:

            I only have 25 miles use on them and noticed immediate improvements in idle and highway driving on a 2.0 liter 4 cyl. 5th gear on my car has much better acceleration. I can attest proof positive that the Denso IK16 Iridium has improved my engines performance enough to be noticed and not subtle. I have never noticed this much improvement changing spark plugs on a car till now !

            • Car & Truck:
            • Casual Driver

            Comment on this review(earn points)

            (3 of 6 customers found this review helpful)

             
            5.0

            I would buy this product again.

            By Jack

            from Colorado Springs, CO

            Verified Buyer
            Helpful Reviewer

            Pros

            • Improves Engine Efficiency
            • Increases Power

            Cons

              Best Uses

              • Everyday Driving
              • Replacement

              Comments about Denso IK16 Iridium Power Spark Plug:

              great products. Highly recommended!!!!

              • Car & Truck:
              • Casual Driver

              Comment on this review(earn points)

              (2 of 5 customers found this review helpful)

               
              5.0

              Great product, + 20% off online

              By GrayGhost

              from Northern Virginia

              Verified Buyer
              Level 1

              Pros

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

              Cons

                Best Uses

                • Everyday Driving
                • Replacement
                • Restoration

                Comments about Denso IK16 Iridium Power Spark Plug:

                Made car run like new again

                • Car & Truck:
                • Casual Driver

                Comment on this review(earn points)

                (4 of 7 customers found this review helpful)

                 
                5.0

                "I would buy this product again and agai

                By Dprofessor1

                from Wheaton, Il

                Verified Buyer
                3 or more reviews submitted

                Pros

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

                Cons

                  Best Uses

                  • Everyday Driving
                  • Replacement

                  Comments about Denso IK16 Iridium Power Spark Plug:

                  Too early to tell if they are what they say they are. Only put 500 miles on the car so will have to drive a bit more to see if they perform as expected.

                  • Car & Truck:
                  • Casual Driver

                  Comment on this review(earn points)

                  Displaying reviews 1-7

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                  Do you have questions about this product?(earn points for answers!)

                   

                  Ask a question, get answers from real customers and in-house experts. Or contact Customer Care by email or call 1-877-238-2623.

                  4 Questions | 4 Answers
                  Displaying questions 1-4
                  • Q:

                    Hi

                    Are these pre-gapped and requireno gapping?
                    Asked on 4/30/2014 by Dan

                    1 answer

                    • CUSTOMER CARE

                      A:

                      Hi Dan, great question! 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.

                      Answered on 4/30/2014 by Vincent from AAP
                  • Q:

                    What heat range should my car be the other plugs are in the 5 heat range can't I damage my engine with a heat range 11 points higher!!
                    Asked on 2/15/2012 by Anonymous

                    1 answer

                    • CUSTOMER CARE

                      A:

                      If you could please provide the year, make, model and engine size of the vehicle and we would be better able to assist you.

                      Answered on 2/15/2012 by Steve from AAP
                  • Q:

                    Hi all,

                    I have a question to you. I juat want to make clear and be 100 percent sure that this Denso IK 16 Iridium Power Spark Plug, Part No. 5303 is 100% Japanese that it's made in japan.

                    Sincerely,
                    Nick
                    Asked on 6/17/2011 by nickydude87

                    1 answer

                    • CUSTOMER CARE

                      A:

                      Yes, this is made in Japan.

                      Answered on 6/23/2011 by Vincent from AAP
                  • Q:

                    What is the heat range rating for this plug?
                    Asked on 2/4/2010 by kenpowerboater from Myrtle Beach South Carolina

                    1 answer

                    • A:

                      it says the heat range is 16 in the specs

                      Answered on 3/26/2010 by none from dont no
                  Displaying questions 1-4

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