Top Iridium Spark Plug Brands for Superior Performance

Iridium spark plugs are renowned for their durability and high-performance capabilities, making them a favorite among automotive enthusiasts and mechanics alike. Their ability to provide better ignition and longer lifespan compared to conventional plugs makes choosing the right brand essential. In the market today, several brands stand out due to their exceptional quality and performance. To explore a comprehensive list of the best brands for iridium spark plugs available, read on below.

Illustration of iridium spark plugs

Best brands of iridium spark plugs in 2025

NGK

NGK is a leading manufacturer of iridium spark plugs, renowned for its innovative designs and high-performance materials. The company has been at the forefront of introducing iridium and platinum-tipped products, which offer improved durability and performance, with iridium spark plugs having a six times higher melting point and being six times harder than platinum. NGK's products are widely used in various automotive and motorcycle applications, with many motorcycles coming equipped with NGK spark plugs from the factory. The company's strong global presence includes manufacturing facilities and an extensive distribution network, particularly with recent expansions in Japan to meet rising demand. NGK's commitment to research and development has solidified its competitive position in the market.

Denso

Denso Corporation is renowned as one of the leading producers of iridium spark plugs, known for their exceptional performance and longevity. Denso's Iridium Long Life spark plugs feature a fine-wire iridium center electrode and a platinum ground electrode, enduring extreme temperatures and lasting up to 100,000 miles. These plugs are designed to withstand higher pressures and temperatures, reducing spark plug wear and erosion, and are six times harder and eight times stronger than conventional platinum plugs. Denso's patented Iridium alloy has set a new standard in spark plug technology, with applications in luxury vehicles from automakers like GM, Toyota, Honda, and Mitsubishi. The company's innovative 360° laser-welded spark tip ensures sustained spark performance and improved ignitability. For more information, visit their Iridium Long Life spark plugs page.

Bosch

Bosch is renowned as one of the leading producers of iridium spark plugs, known for their high performance and long lifespan. Bosch's OE Fine Wire Iridium spark plugs offer superior performance, requiring up to 24% less voltage and providing a service life that is four times longer than standard copper plugs. These plugs feature an ultra-fine wire design and a laser-welded tapered ground electrode, ensuring optimum performance and resistance to fouling. In 2023, the global automotive spark plug market, which includes Bosch's offerings, was estimated at USD 4.35 billion and is anticipated to grow at a CAGR of 4.2% from 2024 to 2030. Bosch's commitment to OE technology and innovative materials has made their iridium spark plugs a preferred choice among consumers and automotive manufacturers.

ACDelco

ACDelco is a leading manufacturer of high-quality iridium spark plugs, known for their exceptional durability and performance. In 2023, the iridium segment, which ACDelco dominates, held the largest share of the global spark plug market. Iridium spark plugs from ACDelco are preferred for their longevity, often lasting up to 120,000 miles, and their high melting point of 2,460°C, making them ideal for high-power engines. The global spark plug market, led by iridium plugs, is projected to grow at a CAGR of 6.4% from 2024 to 2034, reaching USD 23.21 billion by 2034. ACDelco's commitment to research and development ensures their products meet the highest standards in the automotive industry. More information on their ignition parts can be found on the GM Parts website.

Champion

Champion is a leading global producer of high-quality spark plugs, including iridium spark plugs, which are designed to optimize engine performance, resist erosion, and minimize wear. Champion's iridium spark plugs are developed in close cooperation with original equipment (OE) manufacturers, ensuring they meet the most stringent requirements. These plugs are known for their durability and are suitable for both modern high-performance engines and older models, covering 95% of the European car parc. Champion's iridium plugs, such as the Bi-Hex Iridium OEM plugs for BMW engines, offer improved ignitability and performance. With continuous innovations and new product introductions, Champion maintains its position as a top provider in the spark plug market.

Autolite

Autolite is a leading producer of high-quality iridium spark plugs, known for their exceptional durability and performance. The Autolite Iridium XP spark plugs feature an iridium-enhanced finewire and a proprietary platinum ground electrode, which increase durability and resistance to wear, extending the life of the plug. These spark plugs are designed to improve engine performance, fuel efficiency, acceleration, and ignitability, making them a preferred choice for those seeking high reliability and performance. In 2023, the iridium segment dominated the market, with iridium spark plugs offering up to 25% longer lifespan compared to platinum plugs. Autolite's innovative designs, such as the tapered ground wire and high alumina multi-rib ceramic insulator, enhance engine efficiency and prevent flash-over.

Mopar

Mopar, though not specifically highlighted as a leader in iridium spark plugs, is a reputable brand in the automotive industry, known for its high-quality components. However, for iridium spark plugs, brands like NGK and Bosch are often praised for their durability and performance, with iridium plugs lasting up to 120,000 miles due to their high melting point of 2,460°C. Iridium spark plugs offer superior performance and longevity, with a CAGR of 5.8% expected from 2024 to 2034 in the automotive sector. These plugs are ideal for high-power engines in marine and aircraft applications, enhancing fuel combustion and engine performance. The global spark plug market, dominated by iridium plugs, is projected to grow significantly, driven by advancements in technology and the demand for high-performance engines.

E3

E3 is a notable brand in the spark plug market, though it is not specifically highlighted as a leading producer of iridium spark plugs. However, E3 spark plugs are known for their unique electrode design and performance. In the automotive spark plug market, iridium spark plugs, such as those from NGK, are popular for their durability and performance, with the iridium segment contributing to the market's growth. The global spark plug market, which includes iridium spark plugs, is expected to grow at a CAGR of 4.2% from 2024 to 2030, driven by advancements in technology and the demand for high-performance engines. For more detailed insights and E3-38 and iridium spark plug test results, you can visit the forum thread.

Brisk

Brisk is renowned as one of the top producers of iridium spark plugs, known for their innovative designs and superior performance. Their iridium spark plugs, such as the P3 ER15YIR-1, feature a Yttrium alloy earth electrode with an Iridium core, providing a low voltage requirement that enhances ignition coil lifespan and facilitates easier cold starts. These plugs are designed for modern, highly stressed engines and offer a service life of up to 60,000 miles. Brisk's products have been praised for outperforming other racing plugs and iridium plugs, showing significant improvements in horsepower, torque, and fuel efficiency. In the competitive spark plug market, Brisk's offerings stand out for their durability and performance.

Motorcraft

Motorcraft, a renowned brand in the automotive industry, is highly regarded for its high-quality iridium spark plugs, which are known for their exceptional durability and performance. Iridium spark plugs from Motorcraft can last up to 120,000 miles, significantly outlasting traditional copper and platinum spark plugs. These plugs are designed to operate efficiently in high-temperature conditions, reducing carbon fouling and enhancing fuel combustion. In 2023, iridium spark plugs, such as those produced by Motorcraft, dominated the market with their superior performance and longevity, making them a preferred choice among manufacturers and vehicle owners alike. The fine wire design of these iridium spark plugs delivers a concentrated spark, improving fuel efficiency and engine performance. For an in-depth analysis of the automotive spark plug market, visit this detailed market report.