IT16 Iridium Power Spark Plug
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Denso IT16 Iridium Power Spark Plug

Part No. 5325 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
Resistor:Yes
Spark Plug Reach:.708 in
Spark Plug Seat Type:Tapered
Spark Plug Thread Size:14 mm
Tip Configuration:0.4mm Iridium
Type:Iridium Power
Wrench Diameter:5/8 in

REVIEW SNAPSHOT®

by PowerReviews
DensoIT16 Iridium Power Spark Plug
 
4.1

(based on 7 reviews)

Ratings Distribution

  • 5 Stars

     

    (5)

  • 4 Stars

     

    (0)

  • 3 Stars

     

    (0)

  • 2 Stars

     

    (2)

  • 1 Stars

     

    (0)

71%

of respondents would recommend this to a friend.

Pros

  • Improves engine efficiency (5)
  • Increases power (5)
  • Easy to install (4)
  • Durable (3)

Cons

No Cons

Best Uses

  • Everyday driving (5)
  • Performance driving (3)

Reviewed by 7 customers

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Displaying reviews 1-7

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2.0

better off with oem

By 

from Buffalo, NY

About Me Auto Enthusiast, Mechanic

Pros

    Cons

    • Decreases Gas Mileage
    • No Improvement In Performance

    Best Uses

    • Performance Driving
    • Racing

    Comments about Denso IT16 Iridium Power Spark Plug:

    Bought 6 of these plugs for a tune up on my 06 impala, after only 1200 miles on them the idle is rough and my gas mileage actually went DOWN(and yes I double checked the gap to ensure it was correct). It isn't a coil pack issue, I replaced the multi shortly after replacing the plugs(new ACDelco multi).Pulling these out and getting Delco iridiums. Best to stick with ACDelco for GM's

    Comment on this review(earn points)

    (2 of 4 customers found this review helpful)

     
    5.0

    Great Plugs

    By 

    from Atlanta Ga

    About Me Casual Driver

    Verified Buyer
    Level 1

    Pros

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

    Cons

      Best Uses

      • Everyday Driving

      Comments about Denso IT16 Iridium Power Spark Plug:

      Good Product...My personal favorite

      Comment on this review(earn points)

      (2 of 4 customers found this review helpful)

       
      5.0

      "I would buy this product again and agai

      By 

      from warm springs , oregon

      About Me Casual Driver

      Verified Buyer
      Level 1

      Pros

      • Durable
      • Easy To Install

      Cons

        Best Uses

        • Everyday Driving

        Comments about Denso IT16 Iridium Power Spark Plug:

        repeat user ... something works stay with it ...

        Comment on this review(earn points)

        (2 of 4 customers found this review helpful)

         
        5.0

        I would buy this product again

        By 

        from vero beach FL

        About Me Competitive Driver

        Verified Buyer
        Level 1

        Pros

        • Easy To Install
        • Improves Engine Efficiency
        • Increases Power

        Cons

          Best Uses

          • Everyday Driving

          Comments about Denso IT16 Iridium Power Spark Plug:

          I would use this product again

          Comment on this review(earn points)

          (6 of 11 customers found this review helpful)

           
          2.0

          Great in the beginning

          By 

          from Bedford, Pa

          Pros

          • Easy To Install
          • Impressive Performance
          • Improves Engine Efficiency
          • Increases Power

          Cons

          • Decreases Gas Mileage
          • Wear Out Quickly

          Best Uses

          • Everyday Driving
          • Performance Driving
          • Racing
          • Replacement

          Comments about Denso IT16 Iridium Power Spark Plug:

          I bought these plugs for a Pontiac G6 GT to liven it up. In the beginning they were great with a large difference in acceleration. However within 700 miles on the plugs this performance increase started to dive downward. My gas mileage went from 25 mpg to somewhere around 16 mpg with only about 2000 miles on the plugs. I currently am looking on the site for the stock delco part number to get my gas mileage and performance back. Right now with 2500 miles on the plugs my car has a rough idle, which will be gone once the Denso's are out! (Use them for race day and then take them out and reinstall your factory ones) For the price they are per plug they should last more than 2500 miles.

          • Car & Truck:
          • Auto Enthusiast, Casual Driver, Competitive Driver, Mechanic, Truck Enthusiast

          Comment on this review(earn points)

          (3 of 6 customers found this review helpful)

           
          5.0

          Great spark plug

          By 

          from Baltimore, MD

          Verified Buyer
          Helpful Reviewer

          Pros

          • Durable
          • Improves Engine Efficiency
          • Increases Power

          Cons

            Best Uses

              Comments about Denso IT16 Iridium Power Spark Plug:

              It is total different after I installed these Denso plugs into my Ford E150 van with 998,000 miles. It had stock Autolite platinum spark plugs which are now with very large gaps. I got 6 of them with 20 off of 50 online deal which go down to [$] a piece for Iridium plug.I couldn't be happier. May be plug wire on next deal??

              Comment on this review(earn points)

              (12 of 15 customers found this review helpful)

               
              5.0

              Go Denso

              By 

              from Kansas City

              Helpful Reviewer

              Pros

              • Improves Engine Efficiency
              • Increases Power

              Cons

              • No Cons

              Best Uses

              • Everyday Driving
              • Performance Driving

              Comments about Denso IT16 Iridium Power Spark Plug:

              These plugs made my cobra mustang run alot better so I tried them in my everyday driver 05 Focus and now it runs alot better also. Just be sure and gap them at factory specs.I am suprised that they perform that much better than the NGK Iridiums that came stock! You will not be disappointed.

              • Car & Truck:
              • Auto Enthusiast

              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.

              6 Questions | 7 Answers
              Displaying questions 1-6
              • Q:

                Hi, Just got your It16 iridium power spark plugs in the mail. was wondering if these plugs were pre-gapped at the factory, and good to install, or if they needed to be gapped at recommended settings still. Thanks
                Asked on 1/16/2013 by Tim from Missoula MT

                1 answer

                • CUSTOMER CARE

                  A:

                  A spark plug part number might fit hundreds of different engines from many different manufacturers. Although the spark plug from the factory will come with a gap to a pre-selected setting, this may not be the right gap for your particular engine. The incorrect plug gap for your engine can contribute to a high rate of misfires, loss of power, plug fouling, poor fuel economy, and accelerated plug wear. It is always best to check the gap against the manufacturer's specifications. If adjusting the gap on fine wire or precious metal plugs such as platinum or iridium be very careful not to apply any pressure or prying force to the fine wire center electrode or insulator as they can be damaged. The gap should be adjusted by only moving the ground electrode.
                  For compatibility of this part with your vehicle, please provide your vehicle make, model and engine specification.
                  For any further assistance, please feel free to call us at 1-877-238-2623 or visit your nearest Advance Auto Parts store and our representatives would be more than happy to assist you.

                  Answered on 1/17/2013 by Aaron from AAP
              • Q:

                I have a 2003 chevy s10 pickup with a 2.2 lt engine. Will this plug work well with this small engine? Will it give it a little more power and will it effect gas mileage for better or worst? What plug would be the best plug for this vehicle to give it a little more power?
                Asked on 6/5/2012 by mic from dalton, Pa.

                1 answer

                • CUSTOMER CARE

                  A:

                  Yes, this Denso IT16 Iridium Power Spark Plug - Part No. 5325 fits your 2003 Chevrolet S10. 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. For further assistance please feel free to call 1-877-238-2623 and one of our representatives will gladly assist you with any questions or concerns you may have.

                  Answered on 6/6/2012 by Steve from AAP
              • Q:

                I have a 2003 Mustang 3.8L V6 with nearly 140K miles. I'm now experiencing poor gas mileage, hesitation and lack of power. I've had conflicting recommendations. 1. Stay with OEM only plug ... only plug that will work with this engine. 2. go to a Bosch platinum 4 plug. 3. go to a NKG Iridium plug. 4. Go to a Denso Iridium plug.
                What is the best plug to go with for this vehicle?
                Asked on 5/16/2011 by Herb from Catonsville, MD

                1 answer

                • CUSTOMER CARE

                  A:

                  I would suggest taking your vehicle to a certified mechanic for a proper diagnosis before buying and having parts installed that may not (solve/be) the problem.

                  Answered on 7/4/2011 by Vincent from AAP
              • Q:

                WANTING TO FIND OUT IF A DENSO IRIDIUM SPARK PLUG IS IDEAL FOR A 1999 FORD EXPLOYER 4.0 6 CYNDER ( EDDIE BAUER EDITION ).
                Asked on 11/1/2010 by PETE from BELVIDERE IL.

                1 answer

                • CUSTOMER CARE

                  A:

                  The denso iridium should work just fine on your Ford.

                  Answered on 12/24/2010 by Anonymous
              • Q:

                Have a 2000 jaguar s type with 3.0 v6 engine with 150,000 miles on original plugs (Autolite single platinum) thinking of replacing with Denso IR or Autolite XP - would it make a noticable difference, or should I just replace with the same Autolite plug since it lasted 150,000 miles without any issues?

                Thanks!
                Asked on 10/9/2010 by Anonymous from Milwaukee, WI

                2 answers

                • CUSTOMER CARE

                  A:

                  Ngk IR are great plugs for that type of vehicle.

                  Answered on 10/11/2010 by michael from aap
                • VERIFIED BUYER

                  A:

                  You can and you should replace old platinum spark plugs with new Iridium spark plugs.
                  You will see the difference if your car has some hesitation when accelerating with old plugs.
                  Denso is OEM brand for Toyota and other Japanese car makers.
                  AAP offers 20 off of over 50 coupon time to time so you may want to keep an eye on that offer to make a sweeter deal.

                  Answered on 10/21/2010 by KSM from Baltimore, MD
              • Q:

                what is the gap for a 2007 ford ranger 2.3L 4cyl.
                Asked on 5/30/2010 by Anonymous

                1 answer

                • CUSTOMER CARE

                  A:

                  Iridium plugs come pre-gapped. You need to get the correct gapped spark plugs that your manufacturer asks for.

                  Answered on 6/1/2010 by Kevin from AAP
              Displaying questions 1-6

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