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10 Best Denso Iridium Spark Plugs of 2025

Tested and Reviewed: Top 10 Denso Iridium Spark Plugs deals with expert ratings from 8.1 to a perfect 10

March 2026 Edition

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1

Editor's Choice

9.7

Set (8pcs) Denso Iridium Long Life Spark Plugs Stock 3421 Iridium Core .043"(1.1mm) Gap Size

Denso

Set (8pcs) Denso Iridium Long Life Spark Plugs Stock 3421 Iridium Core .043"(1.1mm) Gap Size

Editor's bottom line:

“This denso iridium spark plugs is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

8 pack DENSO 3421 Spark Plug
Genuine DENSO Parts
Includes original packaging and hardware
Direct replacement auto parts
Confirm vehicle fitment with Amazon Confirmed Fit

Picked by 397 people today

2

9.5

DENSO # 3324 Iridium LONG LIFE Spark Plugs -- SK16R11 ----- 4 PCS NEW

Denso

DENSO # 3324 Iridium LONG LIFE Spark Plugs -- SK16R11 ----- 4 PCS NEW

Main Highlights

4 pack DENSO 3324 Spark Plug
Genuine DENSO Parts
Includes original packaging and hardware
Direct replacement auto parts
Confirm vehicle fitment with Amazon Confirmed Fit

3

9.5

Denso Spark Plug Iridium TT - 4705

Denso

Denso Spark Plug Iridium TT - 4705

Main Highlights

Spark Plug Iridium TT
Larger spark translates to more power and superior fuel economy
Improved Output - Low voltage requirement and high ignitability improves combustion
Technologically Advanced - Delivers all-round optimum vehicle performance to a much wider range of OE vehicles at an affordable price

4

9.2

DENSO Iridium TT Spark Plug 4 Pack - IXEH20TT - Twin Tip - The Powerful Premium Quality Ultra-Efficient Replacement Plug

Denso

DENSO Iridium TT Spark Plug 4 Pack - IXEH20TT - Twin Tip - The Powerful Premium Quality Ultra-Efficient Replacement Plug

Main Highlights

IXEH20TT | Twin Tip Plug | Tightneing Torque (Nm): 17 | 1 - Earthed Electrode | Diameter (mm): 12 | Thread Length (mm): 26.5
The Finest Twin Tip plug with improved acceletation, fuel economy and longevity compared to single tip plugs. The quenching effect has been decreased by forming the electrode into a double needle shape. As a result, the flame kernel rapidly develops and the engines power is drawn out to its maximum potential. DENSO IRIDIUM TT spark plugs have a 0.4 mm iridium alloy center electrode and a 0.7 mm needle-type platinum alloy ground electrode.
The iridium tip is mounted with an All-around Laser Welding method that insures high reliability even under the most severe driving conditions.
Using DENSOs exclusive iridium alloy having a very high melting point, the tip of the center electrode can be shaped very thin and fine, reducing spark voltage requirements and greatly improving ignitability.
All specification types include an embedded, highly reliable, monolithic resistor to eliminate electoromagnetic noise interference from all kinds of electronic devices.

5

9.0

4 pc DENSO Iridium Long Life Spark Plugs compatible with Toyota Corolla 1.8L L4 2009-2015

Sixity Auto

4 pc DENSO Iridium Long Life Spark Plugs compatible with Toyota Corolla 1.8L L4 2009-2015

Main Highlights

Genuine DENSO Parts
REDUCE EMISSIONS AND MISFIRES: The patented DENSO Spark Plug enables complete fuel ignition in the combustion chamber; It virtually eliminates erratic starts caused by poor fuel mixtures and excessive fouling; The DENSO Spark Plug employs a unique ground electrode designed to generate a larger spark nucleus at the point of ignition; Greater spark energy means improved flame travel, producing more complete, consistent, and efficient combustion
TRUST IN DENSO: The automotive industry has recognized the DENSO commitment to quality through such prestigious awards as the Deming Award for Quality, the J;D; Power and Associates Chairman's Award, and numerous supplier awards for quality
RELY ON QUALITY AUTO PARTS: From the development of direct ignition coils to revolutionizing the concept of the aftermarket performance spark plug by using platinum and iridium, DENSO is often on the front lines of product advancement

6

8.8

DENSO # 3417 Iridium LONG LIFE Spark Plugs - SK16HR11-4 PCS * NEW *

Denso

DENSO # 3417 Iridium LONG LIFE Spark Plugs - SK16HR11-4 PCS * NEW *

Main Highlights

FREE SHIPPING to anywhere IN USA and territories For This Item
Iridium LONG LIFE
DENSO 3417
1order = 4 Pieces

7

8.6

Denso # 5304 IRIDIUM Power Spark Plugs -- IK20 --- 6 PCSNEW --

Denso

Denso # 5304 IRIDIUM Power Spark Plugs -- IK20 --- 6 PCSNEW --

Main Highlights

6 pack DENSO Iridium Power 5304 Spark Plug
IRIDIUM POWER
DENSO 5304
1order = 6 Pieces

8

8.3

Set (8pcs) Denso Iridium Long Life Spark Plugs Stock 3297 Iridium Core .043"(1.1mm) Gap Size

Denso

Set (8pcs) Denso Iridium Long Life Spark Plugs Stock 3297 Iridium Core .043"(1.1mm) Gap Size

Main Highlights

Item Package Dimension: 9.5L x 9.5W x 0.5H inches
Item Package Weight - 0.5 Pounds
Item Package Quantity - 8
Product Type - SPARK PLUG

9

8.1

6 pc DENSO Iridium TT Spark Plugs compatible with Toyota Tacoma 3.5L V6 2016-2017

Sixity Auto

6 pc DENSO Iridium TT Spark Plugs compatible with Toyota Tacoma 3.5L V6 2016-2017

Main Highlights

Genuine DENSO Parts
RELY ON QUALITY AUTO PARTS: From the development of direct ignition coils to revolutionizing the concept of the aftermarket performance spark plug by using platinum and iridium, DENSO is often on the front lines of product advancement
REDUCE EMISSIONS AND MISFIRES: The patented DENSO Spark Plug enables complete fuel ignition in the combustion chamber; It virtually eliminates erratic starts caused by poor fuel mixtures and excessive fouling; The DENSO Spark Plug employs a unique ground electrode designed to generate a larger spark nucleus at the point of ignition; Greater spark energy means improved flame travel, producing more complete, consistent, and efficient combustion
TRUST IN DENSO: The automotive industry has recognized the DENSO commitment to quality through such prestigious awards as the Deming Award for Quality, the J;D; Power and Associates Chairman's Award, and numerous supplier awards for quality

10

8.1

DENSO # 3461 IRIDIUM LONG LIFE Spark Plugs -- SXU22HCR11S ----- 4 PCSNEW

Denso

DENSO # 3461 IRIDIUM LONG LIFE Spark Plugs -- SXU22HCR11S ----- 4 PCSNEW

Main Highlights

Designed for better overall durability
It offers superior performance with improved fuel efficiency
Super easy, safe and seamless installation
Item model number: ?SXU22HCR11S

Our Best Overall Choice

9.7

Set (8pcs) Denso Iridium Long Life Spark Plugs Stock 3421 Iridium Core .043"(1.1mm) Gap Size

Denso

Set (8pcs) Denso Iridium Long Life Spark Plugs Stock 3421 Iridium Core .043"(1.1mm) Gap Size

Editor's bottom line:

“This is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

8 pack DENSO 3421 Spark Plug
Genuine DENSO Parts
Includes original packaging and hardware
Direct replacement auto parts
Confirm vehicle fitment with Amazon Confirmed Fit

Deals are Live

Special Amazon deal ends in:

Set (8pcs) Denso Iridium Long Life Spark Plugs Stock 3421 Iridium Core .043"(1.1mm) Gap Size

Special Amazon deal ends in: