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

Part No. 3421 Warranty Details  
$8.99
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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
Material:0.7mm Iridium
Reach:1.04 in
Resistor:Yes
Seat Type:Gasket
Thread Diameter: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 22 reviews)

Ratings Distribution

  • 5 Stars

     

    (14)

  • 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

 

sk20,hr plugs

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...Read complete review

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.

Reviewed by 22 customers

Displaying reviews 1-10

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5.0

Truck runs like new!

By 

from Landolakes, Florida

See all my reviews

Verified Buyer

Pros

  • Good price when ordered online
  • Manufacturers OE
  • Plastic sleeve on plugs for protection in box.
  • Pre gapped (I checked)

Cons

    Best Uses

      Comments about Denso SK20HR11 Iridium Long Life Spark Plug:

      I used to tune my truck up. It runs like new, and on board computer shows a immediate fuel mileage improvement.

      • Was this a gift?:
      • No
       
      5.0

      OEM plug, exactly the same

      By 

      from Butts Co. GA

      Verified Buyer

      Comments about Denso SK20HR11 Iridium Long Life Spark Plug:

      These plugs are an unbeatable value; $20 speed perks and % off code the whole job cost $50 w/ tax on our 2010 Tundra 5.7L

      • Was this a gift?:
      • No
       
      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.

         
        5.0

        Great quality, easy to install

        By 

        from Austin, TX

        About Me Casual Driver

        See all my reviews

        Ask me a question

        3 or more reviews submitted

        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.

          (3 of 3 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

            (0 of 5 customers found this review helpful)

             
            3.0

            OEM upgraded plugs

            By 

            from Dayton, OH

            About Me Casual Driver

            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.

            (2 of 7 customers found this review helpful)

             
            3.0

            nothing special

            By 

            from sussex nj

            About Me Mechanic

            See all my reviews

            Verified Buyer

            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

            (2 of 6 customers found this review helpful)

             
            5.0

            good value

            By 

            from austin, texas

            About Me Auto Enthusiast, Casual Driver

            Verified Buyer

            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.

              (3 of 8 customers found this review helpful)

               
              3.0

              sk20,hr plugs

              By 

              from Georgia

              About Me Truck Enthusiast

              Verified Buyer
              Helpful Reviewer

              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.

              (2 of 2 customers found this review helpful)

               
              5.0

              Well worth buying

              By 

              from Export, PA

              About Me Auto Enthusiast

              Verified Buyer

              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.

                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.

                9 Questions | 9 Answers
                Displaying questions 1-9
                • Q:

                  Please can I use SK20HR11 for my Pontiac Vibe 2003 model? Thanks
                  Asked on 9/20/2016 by James from Ghana

                  1 answer

                  • CUSTOMER CARE

                    A:

                    No, this Denso SK20HR11 Iridium Long Life Spark Plug (Part No. 3421) is not an exact fit for your 2003 Pontiac Vibe. We do have an exact Iridium spark plug part available online for your vehicle and the part number is 3324. Please enter your vehicle on our website and search for this part to check the fitment.

                    Answered on 9/21/2016 by Steve from AAP
                • Q:

                  Do I need to gap these plugs for a 2006 tacoma pre-runner V-6?
                  Asked on 7/3/2016 by Jerry

                  1 answer

                  • CUSTOMER CARE

                    A:

                    Hi Jerry, glad to assist you! This Denso SK20HR11 Iridium Long Life Spark Plug (Part no. 3421) is an exact fit for your 2006 Toyota Tacoma Pre-Runner V6 engine and it is pre-gapped at 0.044" inch.

                    Answered on 7/4/2016 by Steve from AAP
                • Q:

                  Is this dual electrode plug? thanks
                  Asked on 12/21/2015 by Fran from United States

                  1 answer

                  • CUSTOMER CARE

                    A:

                    Hi Fran, I'm glad to assist you. This Denso SK20HR11 Iridium Long Life Spark Plug (Part No. 3421) is not a dual electrode plug.

                    Answered on 12/22/2015 by Steve from AAP
                • 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 1-9

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