SK20HR11 Iridium Long Life Spark Plug
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Denso SK20HR11 Iridium Long Life Spark Plug

Part No. 3421 Warranty  

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This long-life spark plug features a special iridium alloy (90% Ir) and a platinum ground strap.
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Electrode Core Material:Copper
Electrode Tip Material:0.7mm Iridium
Ground Strap Quantity:1
Insulator Type:Purified Alumina
Manufacturer Heat Range:20
Resistor:Yes
Spark Plug Reach:1.04 in
Spark Plug Seat Type:Gasket
Spark Plug Thread Size:14 mm
Tip Configuration:0.7mm Iridium
Type:Iridium Long Life
Wrench Diameter:5/8 in

REVIEW SNAPSHOT®

by PowerReviews
DensoSK20HR11 Iridium Long Life Spark Plug
 
4.4

(based on 17 reviews)

Ratings Distribution

  • 5 Stars

     

    (9)

  • 4 Stars

     

    (5)

  • 3 Stars

     

    (3)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (0)

94%

of respondents would recommend this to a friend.

Pros

  • Easy to install (12)
  • Improves engine efficiency (11)
  • Increases power (8)
  • Durable (4)

Cons

  • No improvement in performance (4)

Best Uses

  • Replacement (14)
  • Everyday driving (13)
  • Performance driving (5)
    • Car & Truck:
    • Casual driver (3)
    • Reviewer Profile:
    • Auto enthusiast (6), Casual driver (5), Truck enthusiast (5), Mechanic (3)

Most Liked Positive Review

 

Denso Iridium Plug (long reach)

I replaced the plugs on my tundra, heard many times that Tundras love the Denso brand plugs,
which half of the plugs were OE, easy replacement, and they are long reach as...Read complete review

I replaced the plugs on my tundra, heard many times that Tundras love the Denso brand plugs,
which half of the plugs were OE, easy replacement, and they are long reach as specified by a label on the valve cover. No significant improvement after
24 days driving on them, but perhaps the extra 20-24 miles per gas tank was the replacement of plugs, who knows, its only the 1st tank full. Seems to do its job no negative effects known to me. Price is good in comparison with the other Japanese brand of NGK iridiums.

VS

Most Liked Negative Review

 

OEM upgraded plugs

Bought this plugs to replace my OEM plugs on 2008 tacoma and thinking it would improve performance, but turns out there are no improvement in performance. I heard these plugs suppose to last longer...Read complete review

Bought this plugs to replace my OEM plugs on 2008 tacoma and thinking it would improve performance, but turns out there are no improvement in performance. I heard these plugs suppose to last longer (50K miles or more) but the iridium tip is so thin and small so I am not sure it will last that long. If you replace your plugs according to your manual, just go with the OEM regular plugs instead.

Reviewed by 17 customers

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Displaying reviews 1-10

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3.0

OEM upgraded plugs

By TacomaRunner

from Dayton, OH

About Me Casual Driver

Level 1

Pros

  • Easy To Install

Cons

  • Expensive
  • No Improvement In Performance
  • Thin Iridium Tips

Best Uses

  • Everyday Driving
  • Long Life
  • Replacement

Comments about Denso SK20HR11 Iridium Long Life Spark Plug:

Bought this plugs to replace my OEM plugs on 2008 tacoma and thinking it would improve performance, but turns out there are no improvement in performance. I heard these plugs suppose to last longer (50K miles or more) but the iridium tip is so thin and small so I am not sure it will last that long. If you replace your plugs according to your manual, just go with the OEM regular plugs instead.

Comment on this review(earn points)

 
3.0

nothing special

By mountainman

from sussex nj

About Me Mechanic

Verified Buyer
Level 2

Pros

  • Easy To Install

Cons

  • No Improvement In Performance

Best Uses

  • Everyday Driving
  • Replacement

Comments about Denso SK20HR11 Iridium Long Life Spark Plug:

Installed these plugs 2 weeks ago replacing original plugs after 50k miles. still getting 20mpg on my Tacoma. No change in performance or mpg but still a good plug

Comment on this review(earn points)

 
5.0

good value

By taco mark

from austin, texas

About Me Auto Enthusiast, Casual Driver

Verified Buyer
Level 1

Pros

  • Easy To Install
  • Improves Engine Efficiency
  • Increases Power

Cons

    Best Uses

    • Everyday Driving
    • Replacement

    Comments about Denso SK20HR11 Iridium Long Life Spark Plug:

    after 111,000 miles on my 2007 Tacoma I decided to change the plugs. Went with the denso after reading reviews. Plugs were a huge difference in overall engine performance.

    Comment on this review(earn points)

    (0 of 3 customers found this review helpful)

     
    3.0

    sk20,hr plugs

    By Cruiser

    from Georgia

    About Me Truck Enthusiast

    Verified Buyer
    Level 1

    Pros

    • Easy To Install

    Cons

    • No Improvement In Performance

    Best Uses

    • Replacement

    Comments about Denso SK20HR11 Iridium Long Life Spark Plug:

    Installed in my 2005 Toyota Tacoma 6-cylinder for long life performance. Original plugs were changed with 1 denso coil pack at the same time (131,000 miles). Have not seen any performance differences.

    Comment on this review(earn points)

     
    5.0

    Well worth buying

    By P

    from Export, PA

    About Me Auto Enthusiast

    Verified Buyer
    Level 1

    Pros

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

    Cons

      Best Uses

      • Everyday Driving
      • Performance Driving
      • Replacement
      • Restoration

      Comments about Denso SK20HR11 Iridium Long Life Spark Plug:

      Our car started stalling, mostly on start of driving. I was advised to change sparkplugs. I selected SK20HR11 based on recommendations I found on the Internet. The change was immediate: No more stalling, better acceleration.

      Comment on this review(earn points)

      (2 of 4 customers found this review helpful)

       
      5.0

      nice ez and fast

      By yoyo runner

      from michigan detroit

      About Me Auto Enthusiast, Casual Driver, Truck Enthusiast

      Verified Buyer
      Level 1

      Pros

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

      Cons

        Best Uses

        • Everyday Driving
        • Replacement

        Comments about Denso SK20HR11 Iridium Long Life Spark Plug:

        great

        Comment on this review(earn points)

        (2 of 4 customers found this review helpful)

         
        4.0

        Great Quality

        By Juton

        from Houston, TX

        About Me Casual Driver

        Verified Buyer
        Level 1

        Pros

        • Durable
        • Improves Engine Efficiency

        Cons

          Best Uses

          • Everyday Driving
          • Replacement

          Comments about Denso SK20HR11 Iridium Long Life Spark Plug:

          Denso in my opinion are top quality spark plugs.

          Comment on this review(earn points)

          (2 of 4 customers found this review helpful)

           
          5.0

          Denso Sparkplugs

          By tacoman

          from Cherry Valley,IL

          About Me Truck Enthusiast

          Verified Buyer
          Level 1

          Pros

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

          Cons

          • none

          Best Uses

          • Everyday Driving
          • Performance Driving
          • Replacement

          Comments about Denso SK20HR11 Iridium Long Life Spark Plug:

          Quality product

          Comment on this review(earn points)

          (2 of 4 customers found this review helpful)

           
          4.0

          I would buy this product again

          By Gus

          from Grafton, MA

          About Me Casual Driver

          Verified Buyer
          Level 1

          Pros

          • Easy To Install
          • Plugs Were Gap Correct

          Cons

          • No Improvement In Performance
          • They Are The Stock Plug

          Best Uses

          • Replacement

          Comments about Denso SK20HR11 Iridium Long Life Spark Plug:

          fit as expected

          Comment on this review(earn points)

          (2 of 4 customers found this review helpful)

           
          4.0

          Good for what I paid!

          By Jamac

          from Simpsonville, sc

          About Me Competitive Driver

          Verified Buyer
          Level 1

          Pros

          • Easy To Install
          • Improves Engine Efficiency
          • Increases Power

          Cons

            Best Uses

            • Performance Driving
            • Racing

            Comments about Denso SK20HR11 Iridium Long Life Spark Plug:

            Not Bad,about the same as my ngk.

            Comment on this review(earn points)

            Displaying reviews 1-10

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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.

            5 Questions | 5 Answers
            Displaying questions 1-5
            • Q:

              I hav a 2005 Toyota Tacoma Prerunner (1GR-FE) 4.0 V6. The owners manual states that this particular plug is for the (2TR-FE) 2.7 4 cylander. which plug is best for my vehicle?
              Asked on 5/20/2013 by Csm12 from Jackson, GA

              1 answer

              • CUSTOMER CARE

                A:

                This Denso SK20HR11 Iridium Long Life Spark Plug - part# 3421 is an exact fit for your 2005 Toyota Tacoma Pre Runner. 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 5/20/2013 by Vincent from AAP
            • Q:

              I have a 2009 Toyota Tacoma with 4.0L V-6 engine. Will this plug work in my truck?
              Asked on 12/28/2012 by whistle pig

              1 answer

              • CUSTOMER CARE

                A:

                Yes, this Denso SK20HR11 Iridium Long Life Spark Plug - part# 3421 is an exact fit for your 2009 Toyota Tacoma. For any further assistance, please visit your nearest Advance Auto store or call us directly at 1-877-ADVANCE (238-2623) and one of our representatives there would be more than happy to assist you.

                Answered on 12/28/2012 by Vincent from AAP
            • Q:

              I have Toyota vitz 2006 model.Is this correct spark plug for that vehicle ?
              Asked on 10/16/2012 by Laxman from Mauritius

              1 answer

              • CUSTOMER CARE

                A:

                Sorry, this Denso SK20HR11 Iridium Long Life Spark Plug - part# 3421 does not fit your 2006 Toyota Vitz. Please check with the Denso K16R-U11 Standard Spark Plug - part# 3120 which is an exact fit for your 2006 Toyota Vitz. For any further assistance, please visit your nearest Advance Auto store or call us directly at 1-877-ADVANCE (238-2623) and one of our representatives there would be more than happy to assist you.

                Answered on 10/16/2012 by Vincent from AAP
            • Q:

              are Denso SK20HR11 pre-gapped for 08 Toyota 4runner
              Asked on 6/30/2012 by Joe

              1 answer

              • CUSTOMER CARE

                A:

                This Denso SK20HR11 Iridium Long Life Spark Plug - part# 3421 is pre-gapped for 0.044" and fits only for 2008 Toyota 4Runner with 4.0L V6 engine. For any further assistance, please visit your nearest Advance Auto store or call us directly at 1-877-ADVANCE (238-2623) and one of our representative there would be more than happy to assist you.

                Answered on 7/2/2012 by Vincent from AAP
            • Q:

              I own a 2007 Volvo s40 2.4 and would like to replace the old spark plugs with the Denso SK20HR11 plugs. I noticed that the plugs come pre-gapped. I looked in an aftermarket repair manual which does not specify what the gap should be for my particular car. Could you check to see what the correct gap should be for my specific vehicle? No modifications have been made to my car (all OEM).
              Asked on 4/11/2012 by Anonymous

              1 answer

              • CUSTOMER CARE

                A:

                Yes, this part Denso SK20HR11 Iridium Long Life Spark Plug, Part No. 3421 manufactured by Denso fits your 2007 Volvo S40 2.4I. The spark plug gap for your particular car ( VIN: B5244S4 as well as VIN: B5244S7) should be Gap: 0.032''.

                Answered on 4/12/2012 by Aaron from AAP
            Displaying questions 1-5

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