Choose a Store
- Shop All
- Replacement Parts
- Performance Parts
- Accessories
- Oil & Fluids
- Special Offers
- Advance Rewards
- Advice & How-Tos
- Project Guides
Share
DENSO Iridium Long-Life Spark Plug: OE Performance, SK20HR11
1 yr replacement if defective
How Would You Like To Get This Item?
Store Pickup
Same Day Home Delivery
Home Delivery
Product Information
Product Details
Part No. 3421
Warranty Details (1 YR REPLACEMENT IF DEFECTIVE)
Engineered to meet the highest OE performance, durability, and emissions standards, this Iridium Long-Life Spark Plug is a game-changer for your vehicle's ignition system. Featuring DENSO's patented Iridium Alloy with a 90% Iridium fine wire center electrode and a platinum ground electrode, it delivers exceptional spark performance and longevity, lasting up to three times longer than conventional plugs. The 360-degree laser welding process ensures a robust bond and structural integrity, even under extreme conditions exceeding 4,000 Deg F. Designed for sustained performance over 100,000 miles, it enhances engine efficiency by providing more horsepower, quicker starts, and fewer misfires, even under heavy loads. Additionally, its advanced design promotes better fuel efficiency, helping you save on costs while reducing emissions. With a flat seat type and premium materials, this spark plug is built to endure and optimize your vehicle's performance for the long haul.
Product Features:
Product Features:
- Latest OE technology with DENSO's patented Iridium Alloy (90 percent Ir) and fine wire center electrode
- Platinum ground electrode for extended life
- DENSO Patented 360 degree laser welding process: Ensuring exceptional quality bond and structural strength with the Iridium Center Electrode
- Sustained spark performance over 100,000 miles
- Lasts up to three times as long as conventional plugs
- Endures extreme temperatures greater than 4,000 degrees F associated with high-performance ignition and special fuel systems
- Iridium Long Life
- Enhanced Engine Performance: Enjoy more horsepower, faster and easier starts, and fewer misfires under heavy loads, thanks to the advanced properties of DENSO's Iridium alloy.
- Fuel Efficiency: Experience better conservation of fuel at all times, contributing to overall vehicle efficiency and cost savings.
Specifications
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
4.75 out of 5
309 Customer Reviews
89% of respondents would recommend this to a friend
Ratings Distribution
5 Stars
271
4 Stars
18
3 Stars
10
2 Stars
0
1 Star
10
Pros
45
Improves Engine Efficiency
41
Easy To Install
37
Increases Power
35
Durable
8
Lightweight
Cons
215
No
15
(null)
9
Yes
7
none
5
No Improvement In Performance
Most Liked Positive Review
Incorrect plug
I entered my car 2000 Infiniti I30 with 3.0 V6 to look for spark plugs. A spark plug that is incorrect for my car is shown on your site stating its correct for this car. It is Denso SK16PR-L11. The correct plug shown on Denso's site is Denso SK20PR-L11. The difference is the 16 in the number witch is the heat range. A 16 installed could in fact due major internal damage to my engine including burning a hole in the piston if the cars driven on a very long road trip and since they can be installed for yrs and up to 100,000 miles these days it eventually will take its toll on an engine. It is a hot plug and not the original heat range plug for this car. Please visit Denso's site and update your plug info. Thank you
Most Liked Negative Review
Never Buy These Plugs
I purchased 8 of these a little over a year ago for my Honda Insight and they have been a nightmare. The engine started missing after awhile so I checked the "new" plugs and found that cylinder #3 plug anode was missing! OMG,that means it went through the engine. I replaced it and ordered new Honda plugs. Before I could put the new Honda plugs in Two more of the DENSO plugs failed the same way, anode fell off in the engine. Bad news for me is that after replacing the defective plugs the engine is still missing on cylinder #2, so this means that something else is damaged. See the picture.
Reviewed by 309 Customers
Incorrect plug
I entered my car 2000 Infiniti I30 with 3.0 V6 to look for spark plugs. A spark plug that is incorrect for my car is shown on your site stating its correct for this car. It is Denso SK16PR-L11. The correct plug shown on Denso's site is Denso SK20PR-L11. The difference is the 16 in the number witch is the heat range. A 16 installed could in fact due major internal damage to my engine including burning a hole in the piston if the cars driven on a very long road trip and since they can be installed for yrs and up to 100,000 miles these days it eventually will take its toll on an engine. It is a hot plug and not the original heat range plug for this car. Please visit Denso's site and update your plug info. Thank you
Bottom Line No, I would not recommend to a friend
Great choice for my 2004 5.3l Z71 Tahoe "flex"
Put these in to replace the ac delco pro dbl plats. I researched for days to find a good plug for my truck. Thought the delco's were the way to go. Was I ever wrong truck was like it was dying. Misses, misfires, code p0300. Then saw these with the GM in description. Ordered on line and picked up in store. Had them in a couple hours and truck was cured. Runs awesome now like it should. It just didn't like the plats. I even saw some kind of tsb from gm switching to these plugs. I bit. Stick with iridium and make your ride happy. Thanks to all the counter staff at AAP. They were very nice and fast. Plugs were waiting for me when I got to the store. I'll report back after a few miles if plugs give any problems.
Bottom Line Yes, I would recommend to a friend
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 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
Bottom Line Yes, I would recommend to a friend
Identical to OEM
Verified Buyer -
Denso is the OEM manufacturer for TOYOTA / LEXUS /SCION. These ones are identical to the ones that come in the 2nd generation Prius (2004-2009). If you plan on replacing at the recommended intervals of 100k miles these are perfect. They are a bargain here compared to what the dealer charges for the exact same plug. If you are replacing with the platinums or double platinums to save a few dollars now you will need to change around 30-40k they don't hold up as well with the hybrid engine shutting on and off. Don't forget the dielectric grease for the boots and more importantly the anti sieze grease for the threads.
Bottom Line Yes, I would recommend to a friend
top shelf product
Verified Buyer -
Great product! Japanese companies do know how to handle production of hi-tech parts. These babies will easily get you over 100K miles without hiccup. those spark plugs are not cheap but well worth the expense!
Bottom Line Yes, I would recommend to a friend
Displaying Reviews 1 - 5Back to Top
No results
Feedback
Be The First To Know About Deals And Promotions.
Plus, create an account to receive $5 off of $20 or more.
TOP REPLACEMENT PARTS
ROUTINE MAINTENANCE PARTS
CUSTOMER SUPPORT
ABOUT US
PROFESSIONAL SHOPS