NGK

NGK — The World's #1 Spark Plug Brand

NGK has been manufacturing spark plugs and ignition components since 1936, earning the position of the world's most widely used spark plug brand through consistent quality, precise application engineering, and a product lineup that covers virtually every gasoline and diesel engine on the road. From standard copper plugs to laser iridium performance units, NGK produces spark plugs for OEM factory fill, replacement service, and high-performance applications — with the same engineering rigor applied to every tier of the product lineup.

Copper Spark Plugs

NGK's copper core spark plugs are the baseline of the lineup, providing reliable ignition performance for standard replacement applications across a wide range of domestic and import engines. Copper core construction provides excellent thermal conductivity for consistent heat range performance, with NGK's corrugated ribs and triple gasket seal preventing flashover and ensuring a leak-free installation. Copper plugs are the correct choice for older engines with conventional ignition systems and for applications where plug replacement is performed at standard service intervals.

Platinum & Double Platinum Spark Plugs

NGK platinum spark plugs extend service life beyond copper plugs through a platinum firing tip that resists electrode wear at the higher temperatures generated by modern engine management systems. Double platinum designs place platinum on both the center and ground electrodes, providing consistent gap maintenance over extended service intervals on waste-spark ignition systems where both electrodes experience equal wear. Platinum plugs are the correct OEM-specification replacement for most modern domestic and import vehicles with extended tune-up intervals.

Iridium & Laser Iridium Spark Plugs

NGK's iridium spark plug lineup represents the highest tier of the product range, with iridium firing tips that provide the longest service life and most consistent spark performance of any plug construction. The fine-wire iridium center electrode requires less voltage to fire than a conventional electrode, reducing ignition system load and improving spark reliability at high RPM and under boost. Laser Iridium plugs use a laser-welded iridium tip on both the center and ground electrodes for maximum durability and consistent gap maintenance over 100,000-mile service intervals on supported applications.

For performance and forced induction applications, NGK's iridium plugs provide the spark reliability needed at elevated cylinder pressures where conventional plugs misfire. The reduced firing voltage requirement of the fine-wire iridium electrode is particularly beneficial in turbocharged and supercharged engines where cylinder pressure at ignition timing is significantly higher than a naturally aspirated equivalent.

Racing Spark Plugs

NGK produces a dedicated racing spark plug lineup for competition applications where standard plugs are insufficient for the heat range, electrode configuration, or firing voltage requirements of the engine. Racing plugs are available in a wide range of heat ranges to match the specific thermal load of different engine combinations, fuel types, and boost levels. Correct heat range selection is critical in race applications — a plug that is too cold will foul, while a plug that is too hot risks pre-ignition and engine damage.

Oxygen Sensors

NGK produces OEM-quality oxygen sensors and air/fuel ratio sensors for a wide range of domestic and import vehicles. Wideband and narrowband sensor options cover both pre-cat and post-cat sensor positions, with direct-fit connectors and correct thread pitch for each supported application. NGK oxygen sensors meet or exceed OEM specifications for response time, accuracy, and service life — ensuring correct fuel trim operation and emissions system function after replacement.

Common Applications

NGK spark plugs and sensors cover virtually every domestic and import vehicle platform — including GM, Ford, Chrysler/Mopar, Toyota, Honda, Subaru, Nissan, BMW, Mercedes-Benz, Volkswagen, and Audi applications across all engine types and model years. NGK's application database is the most comprehensive in the spark plug industry, with OEM-specification plugs for current-model-year vehicles and replacement plugs for vintage and classic applications.

Installation Notes

NGK spark plugs are pre-gapped to the OEM specification for most applications — verify the gap against the vehicle specification before installation and adjust carefully if needed, as iridium and platinum fine-wire electrodes are more fragile than copper electrodes and can be damaged by aggressive gapping. Apply anti-seize to plug threads only if specified by the vehicle manufacturer — NGK plugs have a nickel-plated shell that provides adequate corrosion resistance without anti-seize on m...

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  • NGK Spark Plug Stock # 91276 LTR6AHX
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    NGK Spark Plug Stock # 91276 LTR6AHX
    $16.49 USD
    $16.49 USD
    $16.49 USD
    NGK Spark Plug Stock # 91276 LTR6AHX is a NGK spark plugs designed to support consistent ignition performance, dependable combustion, and proper service replacement on compatible applications. This...
  • NGK Spark Plug Stock # 5044 (snowmobile) BR8EIX
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    NGK Spark Plug Stock # 5044 (snowmobile) BR8EIX
    $11.99 USD
    $11.99 USD
    $11.99 USD
    NGK Spark Plug Stock # 5044 (snowmobile) BR8EIX is a NGK spark plugs designed to support consistent ignition performance, dependable combustion, and proper service replacement on compatible applica...
  • NGK Spark Plug Stock # 4285 BKR7EQUP
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    NGK Spark Plug Stock # 4285 BKR7EQUP
    $8.29 USD
    $8.29 USD
    $8.29 USD
    NGK Spark Plug Stock # 4285 BKR7EQUP is a NGK spark plugs designed to support consistent ignition performance, dependable combustion, and proper service replacement on compatible applications. This...
  • NGK Spark Plug Stock # 3521 CR9EIX
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    NGK Spark Plug Stock # 3521 CR9EIX
    $10.99 USD
    $10.99 USD
    $10.99 USD
    NGK Spark Plug Stock # 3521 CR9EIX is a NGK spark plugs designed to support consistent ignition performance, dependable combustion, and proper service replacement on compatible applications. This l...
  • NGK Spark Plug Stock #6637 BPR6EIX
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    NGK Spark Plug Stock #6637 BPR6EIX
    $8.49 USD
    $8.49 USD
    $8.49 USD
    NGK Spark Plug Stock #6637 BPR6EIX is a NGK spark plugs designed to support consistent ignition performance, dependable combustion, and proper service replacement on compatible applications. This l...
  • NGK Spark Plug Spark Plugs 91418
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    NGK Spark Plug Spark Plugs 91418
    $14.49 USD
    $14.49 USD
    $14.49 USD
    NGK Spark Plug Spark Plugs 91418 is a NGK spark plugs designed to support consistent ignition performance, dependable combustion, and proper service replacement on compatible applications. This lis...
  • NGK Spark Plug Stock # 7092 BKR6EGP
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    NGK Spark Plug Stock # 7092 BKR6EGP
    $7.69 USD
    $7.69 USD
    $7.69 USD
    NGK Spark Plug Stock # 7092 BKR6EGP is a NGK spark plugs designed to support consistent ignition performance, dependable combustion, and proper service replacement on compatible applications. This ...
  • NGK Spark Plug Stock 7928 B10ES
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    NGK Spark Plug Stock 7928 B10ES
    $3.99 USD
    $3.99 USD
    $3.99 USD
    NGK Spark Plug Stock 7928 B10ES is a NGK spark plugs designed to support consistent ignition performance, dependable combustion, and proper service replacement on compatible applications. This list...
  • NGK Spark Plug Stock # 6289 CR9EIA-9
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    NGK Spark Plug Stock # 6289 CR9EIA-9
    $11.99 USD
    $11.99 USD
    $11.99 USD
    NGK Spark Plug Stock # 6289 CR9EIA-9 is a NGK spark plugs designed to support consistent ignition performance, dependable combustion, and proper service replacement on compatible applications. This...
  • NGK Spark Plug Stock # 3922 BR6HS
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    NGK Spark Plug Stock # 3922 BR6HS
    $3.99 USD
    $3.99 USD
    $3.99 USD
    NGK Spark Plug Stock # 3922 BR6HS is a NGK spark plugs designed to support consistent ignition performance, dependable combustion, and proper service replacement on compatible applications. This li...
  • NGK Spark Plug Stock 2669 BKR9EIX
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    NGK Spark Plug Stock 2669 BKR9EIX
    $10.49 USD
    $10.49 USD
    $10.49 USD
    NGK Spark Plug Stock 2669 BKR9EIX is a NGK spark plugs designed to support consistent ignition performance, dependable combustion, and proper service replacement on compatible applications. This li...
  • NGK Snowmobile Spark Plug Stock 7548 BR9EYA
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    NGK Snowmobile Spark Plug Stock 7548 BR9EYA
    $6.99 USD
    $6.99 USD
    $6.99 USD
    NGK Snowmobile Spark Plug Stock 7548 BR9EYA is a NGK spark plugs designed to support consistent ignition performance, dependable combustion, and proper service replacement on compatible application...
  • NGK Spark Plug Stock # 9723 SILZKR7B11
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    NGK Spark Plug Stock # 9723 SILZKR7B11
    $14.99 USD
    $14.99 USD
    $14.99 USD
    NGK Spark Plug Stock # 9723 SILZKR7B11 is a NGK spark plugs designed to support consistent ignition performance, dependable combustion, and proper service replacement on compatible applications. Th...
  • NGK Spark Plug Stock # 5477 KR8AI
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    NGK Spark Plug Stock # 5477 KR8AI
    $13.49 USD
    $13.49 USD
    $13.49 USD
    NGK Spark Plug Stock # 5477 KR8AI is a NGK spark plugs designed to support consistent ignition performance, dependable combustion, and proper service replacement on compatible applications. This li...
  • NGK Spark Plug Stock 2227 AP8FS
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    NGK Spark Plug Stock 2227 AP8FS
    $7.99 USD
    $7.99 USD
    $7.99 USD
    NGK Spark Plug Stock 2227 AP8FS is a NGK spark plugs designed to support consistent ignition performance, dependable combustion, and proper service replacement on compatible applications. This list...
  • NGK V-power Racing Plug Std Tip 120 Pack 5238
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    NGK V-power Racing Plug Std Tip 120 Pack 5238
    $766.99 USD
    $766.99 USD
    $766.99 USD
    NGK V-power Racing Plug Std Tip 120 Pack 5238 is a NGK spark plugs designed to support consistent ignition performance, dependable combustion, and proper service replacement on compatible applicati...

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