IK16 Iridium Power Spark Plug
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Denso IK16 Iridium Power Spark Plug

Part No. 5303 Warranty Details  

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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
Material:0.4mm Iridium
Reach:3/4 in
Resistor:Yes
Seat Type:Gasket
Thread Diameter:14 mm
Tip Configuration:0.4mm Iridium
Type:Iridium Power
Wrench Diameter:5/8 in

REVIEW SNAPSHOT®

by PowerReviews
DensoIK16 Iridium Power Spark Plug
 
4.8

(based on 10 reviews)

Ratings Distribution

  • 5 Stars

     

    (8)

  • 4 Stars

     

    (2)

  • 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

No Cons

Best Uses

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

Reviewed by 10 customers

Displaying reviews 1-10

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4.0

Exact replacement in my 2005. Honda Civic Hybrid.

By 

from Avon Park, FL

Verified Buyer

Comments about Denso IK16 Iridium Power Spark Plug:

Improved performance over worn NGK plugs. Installed today so we'll see over the life of the plug. These plugs were pre-gapped @ .040.

 
5.0

Great product

By 

from Detroit

Verified Buyer

Comments about Denso IK16 Iridium Power Spark Plug:

As described

 
5.0

Excellent spark plug

By 

from Ashburn va

Verified Buyer

Comments about Denso IK16 Iridium Power Spark Plug:

Excellent product *****

(3 of 6 customers found this review helpful)

 
5.0

Great iridium spark plug

By 

from Jackson Michigan

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
  • 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.

(5 of 8 customers found this review helpful)

 
5.0

great tune up!!

By 

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

    (4 of 5 customers found this review helpful)

     
    4.0

    seem to work ok so far

    By 

    from ny

    See all my reviews

    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

      (4 of 6 customers found this review helpful)

       
      5.0

      excellent plugs for my Tiburon gs

      By 

      from Alabama

      See all my reviews

      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

          (4 of 7 customers found this review helpful)

           
          5.0

          I would buy this product again.

          By 

          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

            (3 of 7 customers found this review helpful)

             
            5.0

            Great product, + 20% off online

            By 

            from Northern Virginia

            Verified Buyer
            Helpful Reviewer

            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

              (4 of 9 customers found this review helpful)

               
              5.0

              "I would buy this product again and agai

              By 

              from Wheaton, Il

              See all my reviews

              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

                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.

                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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