NGK Laser Iridium®: Engineered for Performance and Longevity

NGK Laser Iridium® spark plugs offer a superior fuel burn and extended service life compared to standard spark plugs. Iridium, rated 6.5 on the Mohs hardness scale, is the second-densest element after osmium and the most corrosion-resistant metal—even at temperatures up to 2000°C. Its exceptional electrical conductivity makes it an ideal material for high-performance spark plugs.

A laser-welded platinum disc on the ground electrode enhances durability, significantly reducing wear and further extending the plug’s lifespan. With both electrodes working efficiently together, the engine benefits from a more stable idle, improved fuel efficiency, lower emissions, and strong anti-fouling properties.

Additionally, the ground electrode features a taper-cut design to minimize flame quenching by reducing obstruction to flame expansion at the electrode tips. This promotes a more complete and efficient combustion process, ultimately improving fuel economy.

Key Features of NGK Laser Iridium® Spark Plugs

• Laser-welded iridium center electrode tip for exceptional durability
• Laser-welded platinum disc on the ground electrode for extended service life
• Trivalent metal plating offers superior corrosion and anti-seizing protection
• Enables faster starts and smoother acceleration
• Superior anti-fouling performance for consistent ignition
• Lower required spark voltage—ideal for reliable cold starts
• Tapered ground electrode enhances flame expansion and combustion efficiency
• Improved fuel economy and reduced emissions
• OEM-approved design—factory-fitted in many modern vehicles
• Renowned NGK quality and engineering excellence
• Proven performance in millions of vehicles worldwide

IMPORTANT - WARNING

** DO NOT USE ANTI-SEIZE LUBRICANT SUCH AS COPPER SLIP ON THE THREADS WHEN FITTING THESE SPARK PLUGS **

• Using thread lubricants can result in over-torqued values by up to 20-25%.
• Torque wrench readings are rendered completely inaccurate and can result in major damage to the engines cylinder head, or sheer the spark plug thread. Virtually all modern spark plugs feature a special zinc-chromate shell plating which provides corrosion resistance to the elements, so no thread lubricant is required.
• Shown below is an over torqued spark plug that sheered due to user installation error. NGK states that incorrect torque values are responsible for up to 90% of all spark plug warranty claims. Incorrect torque can also result in poor engine performance, read below:

• Under-torqued spark plugs don't make full contact with the cylinder head, which reduces the plug’s ability to transfer heat out of the combustion chamber, this results in elevated combustion temperatures and as such can cause pre-ignition and detonation. These two conditions can lead to engine damage. Evidence of under-torqueing can be seen via the crush washer gasket not being as thin as expected (unless it's a tapered type plug).
• Over-torqued spark plugs can cause stress to the metal shell, leading to thread breakage (sheer) as shown in the image below. Over tightening can also compromise the plug’s internal gas seal or even cause a hairline fracture to the insulator. Evidence of over torque is easy to spot, for example hex swelling is visible and usually the crush washer is thinner than expected. If the thread has sheered the breakage will look similar to the spark plug image shown below.
• It's advisable to use a good quality, calibration certified torque-wrench. Users should always wind down their torque-wrench to the minimum scale setting and never all the way down after each use. A fully loaded torque wrench left in storage for a long period of time can cause a 'set' in the spring and weaken it. The result can be an inaccurate torque reading.
• Care must also be taken to ensure the spark plug socket is not slanted at an angle as this can put pressure on the ceramic insulator causing it to crack.

Installation Notes

Compressed air should be used to clean the area around the existing spark plugs before removal. Torqueing the new spark plugs up against any form of debris and build-up in the threads may prevent the plugs from making full contact with the cylinder head, even if a torque wrench indicates otherwise. This can cause poor heat dissipation which leads to higher cylinder temperatures, possibly causing pre-ignition or detonation.

On vehicles where positioning a torque wrench is difficult or impossible, finger tighten the plugs first and then follow the rotational guide shown on the NGK packaging with a standard wrench.

If the engine design means it's difficult to fit or remove spark plugs (or even see them), the plug wrench may tilt off-axis or slip. If the socket slips on the plugs hex and the inside wall of it strikes the ribbing on the plug's insulator, or its terminal, the insulator may break.
Some new spark plugs feature a washer gasket that is designed to be crushed during the last stages of tightening. This will feel different to tightening any normal bolt or nut up.

Only use a spark plug gapping tool which pulls on the ground electrodes neck to adjust the gap on precious metal spark plugs.
The only time anti-seize compound should be used is on vintage spark plugs that do not feature a specialised coating.

Authenticity

As a direct distributor of NGK for more than 14 years, we are proudly committed to supplying only 100% genuine NGK products. At our core, we value quality, reliability, and customer trust—and we take a strong, active stance against counterfeit goods.

To help our customers make informed decisions, we’ve published a series of detailed blog articles focused on identifying fake NGK products. These resources include practical advice and visual comparisons, making it easier to distinguish authentic parts from imitations.

When it comes to performance and reliability, don’t take chances. Choose genuine NGK, so choose us!

 

Vehicle Compatibility

• Please verify fitment by only using the NGK Part Finder.
• If there's an eBay compatibility chart added to this listing, you must use it as a guide only and verify fitment with the NGK Part Finder website. The part finder website provides the latest compatibility data and includes many bug fixes!
• If you cannot find your vehicle in the NGK Part Finder, please drop us an email including your UK reg number, or if ROW a valid VIN number along with full vehicle details, including make, model, cc, horsepower and trim.

Need a Different Quantity?

• Other quantities are available in our shop. Simply search 1x, 2x, 3x etc before the spark plug part number.
• Wholesale discount orders are available - please contact us.

Postage information is provided in the listing's postage tab above the description.