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

Part No. 3421 Warranty Details  

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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
 
4.5

(based on 20 reviews)

Ratings Distribution

  • 5 Stars

     

    (12)

  • 4 Stars

     

    (5)

  • 3 Stars

     

    (3)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (0)

95%

of respondents would recommend this to a friend.

Pros

  • Easy to install (15)
  • Improves engine efficiency (14)
  • Increases power (9)
  • Durable (6)

Cons

  • No improvement in performance (4)

Best Uses

  • Replacement (17)
  • Everyday driving (16)
  • Performance driving (6)
    • Car & Truck:
    • Casual driver (3)
    • Reviewer Profile:
    • Auto enthusiast (7), Casual driver (7), Truck enthusiast (5), Mechanic (4)

Most Liked Positive Review

 

Long Life proper Performance

make sure you use anti seize .this plugs are good for 60K miles plus and you want them to come out after some years. please do no expect that replacing spark plugs on your...Read complete review

make sure you use anti seize .this plugs are good for 60K miles plus and you want them to come out after some years. please do no expect that replacing spark plugs on your Corolla will make it feel like an Avalon and Give you the MPGs of a Prius ,if you replaced the plugs and felt a big difference you probably waited too long

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 20 customers

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Displaying reviews 1-10

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5.0

Sweet!!

By 

from Pennsville NJ

About Me Casual Driver

Pros

  • Easy To Install
  • Improves Engine Efficiency
  • Increases Power

Cons

    Best Uses

    • Everyday Driving
    • Replacement

    Comments about Denso SK20HR11 Iridium Long Life Spark Plug:

    No gap to adjust. Just some anti-seize on the threads and a dab of dielectric grease on the top. It runs better than when I first bought the truck. Improved gas mileage and I can really feel the increase in power.

    Comment on this review(earn points)

     
    5.0

    Great quality, easy to install

    By 

    from Austin, TX

    About Me Casual Driver

    Ask me a question

    Level 4

    Pros

    • Durable
    • Easy To Install
    • Improves Engine Efficiency

    Cons

      Best Uses

      • Everyday Driving
      • Replacement

      Comments about Denso SK20HR11 Iridium Long Life Spark Plug:

      Easy to install in my 2004 Toyota 4Runner (160K miles). Bought these for simply for maintenance. I suggest a 5/8" x 6" Magnetic Swivel Spark Plug Socket, it makes the job 10x easier. Anyway, did plenty of research - Denso is the way to go for Toyotas. I highly recommend these plugs. They will last anywhere from 50K - 75K miles or more but why go that long? I'm changing these at 65K.

      Comment on this review(earn points)

      (2 of 2 customers found this review helpful)

       
      5.0

      Long Life proper Performance

      By 

      from Palm Beach Florida

      About Me Auto Enthusiast, Knows Some About Cars, Mechanic

      Pros

      • Durable
      • Easy To Install
      • Good Durability
      • Improves Engine Efficiency
      • Proper Performance

      Cons

        Best Uses

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

        Comments about Denso SK20HR11 Iridium Long Life Spark Plug:

        make sure you use anti seize .this plugs are good for 60K miles plus and you want them to come out after some years. please do no expect that replacing spark plugs on your Corolla will make it feel like an Avalon and Give you the MPGs of a Prius ,if you replaced the plugs and felt a big difference you probably waited too long

        Comment on this review(earn points)

        (0 of 4 customers found this review helpful)

         
        3.0

        OEM upgraded plugs

        By 

        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)

        (0 of 4 customers found this review helpful)

         
        3.0

        nothing special

        By 

        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)

        (2 of 6 customers found this review helpful)

         
        5.0

        good value

        By 

        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)

          (2 of 7 customers found this review helpful)

           
          3.0

          sk20,hr plugs

          By 

          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)

          (2 of 2 customers found this review helpful)

           
          5.0

          Well worth buying

          By 

          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 

            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)

              (4 of 10 customers found this review helpful)

               
              4.0

              Great Quality

              By 

              from Houston, TX

              About Me Casual Driver

              Verified Buyer
              Helpful Reviewer

              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)

                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.

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

                  This is a replacement plug for a NGK OEM for my saab 93 AERO V6 2007. Do I adjust the gap to .9mm based on my owners manual reference to the NGK plug that came with my car or do I leave it alone. I am not sure since it is a different plug that I should adjust the gap. Right now the Denso plug has a much wider gap than .9mm.
                  Asked on 7/24/2014 by Higgi from Ocala, FL

                  1 answer

                  • CUSTOMER CARE

                    A:

                    I'd be happy to help you with that! You should always gap the spark plugs to match your vehicle specifications. These plugs are gapped at 1.1 mm. Even though it is only a 0.2 difference you should gap to meet manufacturer specs for best driveability.

                    Answered on 7/29/2014 by Anonymous
                • 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 1-6

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