The 10 Best Iridium Spark Plugs Reviews & Comparison

The 10 Best Iridium Spark Plugs Reviews & Comparison

When it comes to the automotive industry, the advancements in technology are really something to marvel at. Take for example the spark plug, a crucial component in the internal combustion engine that has gone through many innovations. The first spark plug was invented by George Brayton in 1836, but it wasn’t until the late 1800s that the spark plug became an integral part of the modern engine. In 1901, the Champion Ignition Company created the first commercially available spark plug and since then, spark plugs have been further developed to produce more powerful sparks.

In the 1960s, the iridium spark plug was introduced by Autolite, a division of Johnson Matthey. Iridium, a rare metal that is part of the platinum group, has the ability to withstand high temperatures and pressures while also allowing more efficient fuel combustion. Iridium plugs are commonly used in the racing industry and are now also available to the mass market.

Top 10 iridium spark plugs Review for 2023

The iridium spark plugs are the most effective and reliable spark plugs. They are considered as being the top-of-the-line spark plugs by most vehicle owners. Iridium is a metal that is very resistant to wear and tear. No wonder it is also used in bulletproof vests.

It is also very dense, being heavier than gold. Iridium plugs are so durable that it can last for 100,000-200,000 miles of use.

1. 6 New NGK Iridium IX Spark Plugs LFR5AIX-11 # 4469

Features :

  • Extreme performance upgrade via OEM spark plugs and provide a lifetime at 40,000 50,000 miles.
  • Plugs have a fine-wire Iridium center electrode and nickel-alloy terrain electrodes for maximum engine and torque.
  • Designed for fuel-injected and turbo engines.
  • Precision laser electrode construction.

Additional Info :

Item Dimensions
Height 4.98
Width 0.94
Length 3.7
Weight 0.000625

The original spark plugs from NGK have been in service for a long time, and they are still going strong. It is made of platinum and iridium. These materials can last longer and can give the best performance compared to other spark plugs on the market. Since they are direct replacement, they are easy to install. They can take on up to 9,000 rpm and can still give the best firing.

This will allow the fuel to burn quickly and cleanly, and the engine will run smoothly. You will also notice a slight increase in the power of your vehicle. However, these spark plugs are really expensive. If you are on a tight budget, then these are not for you.

2. NGK LKAR7BIX-11S Iridium IX Spark Plug (93501 Iridium Ix), 4 Pack

Features :

  • Designed specifically for the performance enthusiast, Iridium IX offers extreme ignitability, improved throttle response and superior anti-fouling
  • The 0.6 millimeter laser welded fine Iridium tip ensures high durability and a consistently stable spark and the tapered ground electrode minimizes electrical quenching effect
  • Longer insulator nose prevents fouling, the corrugated ribs on insulator prevents flashover, and a triple gasket seal eliminates combustion gas leakage
  • Iridium alloy has extremely high melting point, giving it high durability to heat and electrical wear, perfect for today’s high performance engines
  • Trivalent Metal Plating provides superior anti-corrosion and anti-seizing properties

Additional Info :

Item Dimensions
Weight 0.01
Release Date 2018-07-17T00:00:01Z

These plugs have a very high melting point, which ensures a long service life. They also have a reduced voltage gap and a concave glimmer electrode to increase the surface area and a better ignition. They are pre-gapped and are therefore easy to install. They have a long reach thread and a tapered ground electrode tip.

They come with a one-year warranty. These NGK iridium spark plugs are designed to optimize fuel economy and engine performance in many engines. With a long service life, these performance spark plugs are perfect for diesel engines that require a longer service interval.

3. Bosch Automotive (9603) OE Fine Wire Double Iridium Spark Plug – Single

Features :

  • Double Iridium firing pin and ground electrode inlay provide 4X longer service life compared to standard copper plugs
  • 0.6mm fine wire firing pin provides superior ignitability and performance
  • 360° continuous laser weld fuses corrosion resistant iridium firing pin to base for increased durability
  • International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions.

Additional Info :

Item Dimensions
Height 9
Width 7
Length 4
Weight 0.05

Ignition failure is the main cause of a car’s engine failure. If you want to prevent such an occurrence, you should ensure that you use the right spark plug. Bosch automotive (9603) oe fine wire double iridium spark plug is a quality spark plug that will ensure your car’s engine runs smoothly. These plugs are made of double iridium, which reduces the electrical resistance and provides a cleaner, hotter spark.

They are also coated with oe fine wire, which ensures a smoother flow of gas and oil. This coating also prevents the plug from erosion, which ensures the plugs last longer. These plugs are also designed to fit most domestic cars.

4. NGK 6619 Iridium Spark Plugs LFR6AIX-11 – 6 PCSNEW

Features :

  • Iridium Spark Plugs
  • Designed to operate over a much wider heat range than ordinary plugs
  • Resists carbon buildup and pre-ignition
  • Patented triple gasket sealing process eliminates the possibility of combustion gas leakage

Additional Info :

Item Dimensions
Height 4.98
Width 0.94
Length 3.7
Weight 0.72

Iridium technology for a longer lasting spark plug. designed to last 25,000 miles or more. Longer lasting spark plug. designed to last 25,000 miles or more. ngk has developed a new iridium technology that allows a longer lasting spark plug. the iridium electrode tip can last up to 5 times longer than the traditional platinum electrodes used by other manufacturers, which means fewer spark plug changes.

lower maintenance costs and higher engine performance are the main benefits of using ngk iridium spark plugs. Superior anti-corrosion features. the anti-corrosion nickel coating prevents electrode erosion caused by engine exhaust particles. this reduces the risk of early failure, ensuring a long lasting and reliable spark plug.

5. Bosch (9602) HR8LII33U Original Equipment Fine Wire Iridium Spark Plug (8 Pack)

Features :

  • Iridium Spark Plug (8 Pack)

Additional Info :

Item Dimensions
Weight 0.1

The Bosch 9602 is a spark plug designed to fit many vehicles with direct fuel injection systems. It uses an iridium center and a fine wire to reduce fouling and increase the number of miles that can be traveled before needing replacement. These plugs are designed for use in several GM and Ford gasoline engines, including V6 and V8 engines. They feature a laser-etched copper core that improves overall operation and increases the lifespan of the spark plug.

Bosch recommends changing the spark plugs every 30,000 miles for optimum performance and a long life. These plugs are designed for use in several GM and Ford gasoline engines, including V6 and V8 engines.

6. Denso (3297) SK20R11 Iridium Spark Plug, Pack of 1

Features :

  • SK20R11
  • Excellent acceleration and performance
  • Stable combustion during idling
  • Long life and high reliability
  • Features iridium with high melting point

Additional Info :

Item Dimensions
Height 0.98425
Width 0.98425
Length 3.34645
Weight 0.0440924524

The Denso (3397) SK20R11 Iridium spark plug is an affordable option that delivers quality performance. These plugs are made of steel to ensure durability. Iridium is used to coat the electrode to ensure no erosion occurs and a longer lifespan. The Denso (3297) is a direct OE replacement for your vehicle and is pre-gapped to prevent misfires.

It has a resistor-type sensor for better results with fuel-trim feedback and engine control. Engineered for lower-temperature starts, these plugs will give you a noticeable difference in your engine. They’re designed for gasoline engines and are rated to last for up to 80,000 miles.

7. ACDelco GM Original Equipment 41-114 Iridium Spark Plug (Pack of 1)

Features :

  • Iridium offers excellent engine idle stability and smooth performance
  • Iridium allows for small, efficient electrode designs for reliable cold starting and quick acceleration
  • Iridium fine-wire electrode helps burn away carbon deposits on the tip of the plug as they form
  • One piece suppressor seal helps block radio frequencies that can affect vehicle electronics
  • Suppressor seal meters spark energy for long electrode life and helps prevent combustion leakage
  • Some ACDelco GM Original Equipment parts may have formerly appeared as GM Genuine Parts (OE) or ACDelco Professional
  • ACDelco GM Original Equipment parts are designed, engineered and tested to rigorous standards, and are backed by General Motors
  • GM Engineers design and validate OE parts specifically for your Chevrolet, Buick, GMC, or Cadillac vehicle
  • GM regularly updates production and service part designs to integrate new materials and technologies

Additional Info :

Item Dimensions
Height 1
Width 3.5
Length 4.4
Weight 0.44

The ACDelco 41-114 Iridium Spark Plug is a great choice if you are looking for a durable spark plug that will last for over 60,000 miles. It has a platinum-coated tip that makes it resistant to thermal shock and pre-ignition damage. The center electrode is also laser-welded to the insulator to make sure that it stays intact and prevents blowouts. The center electrode is also nickel-plated to prevent corrosion, increasing the lifespan of the spark plug.

The 41-114 Iridium Spark Plug also has a wider electrode gap compared to traditional plugs. This widens the path of the electricity, which means it has a higher energy efficiency.

8. NGK Iridium IX DCPR7EIX Spark Plugs for 1999-2016 Harley Davidson Twin Cam (Pair)

Features :

  • Come pre-gapped

Additional Info :

Item Dimensions
Weight 0.09

The NGK Iridium IX Spark Plugs are designed to fit 1999-2016 Harley-Davidson Twin Cam models. They are ideal for use with stock headers. The Iridium IX Spark Plugs have a higher heat resistance than stock plugs, which leads to a better ignition and combustion. These spark plugs are also designed to reduce fouling, which significantly improves engine performance and acceleration.

The Iridium IX Spark Plugs provide a long-lasting performance, reduced emissions, and improved fuel efficiency. They are designed with a 360° electrode, which is optimized for Harley-Davidson Twin Cam motorcycles. These NGK Iridium IX Spark Plugs come in a pack of 8.

9. NGK 7397 TR5IX Iridium IX Spark Plug, Pack of 4

Features :

  • NGK Sparkplugs
  • 7397
  • Spark plugs

Additional Info :

Item Dimensions
Height 1
Width 3.5
Length 4.1
Weight 0.15

The NGK 7397 features a traditional shell design and is a great choice for anyone looking for a reliable plug that delivers a strong performance. The plug has a wide heat range of 6,000-10,500°F, making it suitable for a variety of applications. It has a melting point of 2,500°F, which is 250°F higher than the average spark plug.

This higher temperature allows the spark plug to work in an even wider range of engines. The plug has a platinum-iron material core, which helps boost the resistance to fouling while increasing the longevity of the product.

10. NGK # 6418 Iridium Spark Plugs BKR6EIX – 4 PCS NEW

Features :

  • Often specified as original equipment, NGK spark plugs are the best combination of performance and longevity.
  • Offering the Quality, Reliability and Durability You’d Expect from an OEM Manufacturer
  • NGK is the world’s largest supplier of OEM spark plugs
  • This Listing is for 4 Spark Plugs
  • Research Applications Prior to Purchase To Make Sure This OEM Part Fits Your Vehicle, Including Engine, Drivetrain and Quantity Needed.

Additional Info :

Item Dimensions
Weight 1.46

The NGK 6418 is a great option for those looking for a plug that can last for up to 100,000 miles. The plugs are made from iridium, which is a very resistant metal that can endure high temperatures without deforming. The design is also double-threaded, which reduces the risk of the spark plug getting loose. The plugs are pre-gap, which means that there is no need for additional firing distance.

This makes them very easy to install, making them a good option for those who are not that experienced with car maintenance. The NGK 6418 is ideal for cars with gasoline engines, including many Toyota models.

Get the Best iridium spark plugs

The iridium spark plug is one of the most advanced spark plugs in the world. It is a direct result of the technological advancements in the automotive industry.

Iridium Spark Plugs have gained a lot of attention lately, partially due to their ability to deliver more fuel to the engine and also the way they heat up to an optimum temperature before igniting the fuel.

The design of the Iridium Spark Plug is what makes it so unique and valuable. Let’s take a closer look at the intricacies of this auto product.

Iridium Spark Plugs are made up of Iridium, which is a rare metal that is found in a few areas in the world. It is an extremely hard metal, which is why it is used to create the Iridium Spark Plugs.

The metal is capable of withstanding very high temperatures before it loses its shape or melts. Iridium is a very dense metal, which is why it is used to create the Iridium Spark Plugs.

Dense metals are capable of withstanding high temperatures, but at the same time, they are also very lightweight. The metal can be used in different applications for various reasons.

Iridium Spark Plugs are also called Iridium Power Plugs. They are also used in other auto parts, such as the Chrysler Jeep Wrangler. The metal is also used to create other automotive products, such as the Iridium Spark Plug Wires.

The metal has gained a lot of popularity and attention in the recent past. It is used to create the engines of the rocket ships. The metal is also used to create spacecrafts.

What is an iridium spark plug?
An iridium spark plug is a unique car part that is made up of Iridium, one of the rarest metals on the planet. Iridium is a very strong, dense metal that can withstand very high temperatures. It is also lightweight and can be used to create different auto parts.

Why are iridium spark plugs so expensive?
The Iridium Spark Plugs are expensive because of the material used to create them. The metal is rare and can’t be found in a few parts of the world. Only a few companies can create them, which is why their prices are so high.

What are the benefits of iridium spark plugs?
Iridium Spark Plugs have many unique benefits that other spark plugs cannot offer. For

Frequently Questions and Answers

  • What are iridium spark plugs?

    What is the best spark plug for a 2006 Dodge Charger What are the best spark plugs for 2006 Charger What are the best iridium spark plug brands What spark plugs last the longest What is the best performance spark plug What are the best spark plugs for a 5. 7 hemi What are the best spark plugs for 5.

  • What is the best iridium spark plug?

    The best iridium spark plug is the NGK IRIDIUM IX. It is the most popular spark plug and is made by the most trusted brand in the industry. Iridium spark plugs last longer than platinum and even longer than most other iridium plugs.

    How much do iridium spark plugs cost Iridium spark plugs are significantly more expensive than traditional platinum plugs.

  • Are iridium spark plugs worth it?

  • Which spark plug is the best?

  • What are the best spark plugs made of?

    What spark plug is best for a LS1 Should I use a Iridium spark plug or a regular one What are the best spark plugs for a 6. 5 Hemi How do you change spark plugs on a 2001 Duramax What is the best spark plug for a Jeep Liberty What are the best spark plugs for a Miata What are the best spark plugs for a 6.


The plugs you choose for your car have a huge impact on your fuel economy, performance, and overall health of your engine. While it’s tempting to go for the plug that glows the brightest under a black light, you need to pay more attention to the heat range, electrode design, and material. The plugs we mentioned in this guide are some of the best plugs you can get for your car.

However, if you’re still having a hard time picking the right one, you can always get in touch with a mechanic who can help you decide. Finally, we’d like to thank you for reading this article.

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