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The Green Spark Plug Company£11.31Visit shop Ngk Ilker7b8egs 91512 Spark Plug Iridium New Ngk-Ilker7b8egs
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The NGK Spark Plugs Set 91512 is designed for vehicle owners and DIY mechanics looking to restore or maintain engine ignition efficiency through high-quality OE specification components. These iridium-tipped plugs offer superior durability and consistent spark ignition, resulting in smoother engine performance and fuel efficiency. A primary caveat to keep in mind is that while they are designed for a broad range of applications, they must match your vehicle's specific thread and reach requirements exactly to avoid engine damage.
| Model Part Number | 91512 |
|---|---|
| Brand | NGK |
Yes, this package contains four individual NGK iridium spark plugs.
No, you must verify that your vehicle's engine requires an M12 x 1.25 thread and 28mm reach. Check your owner's manual or a fitment guide.
While NGK plugs are pre-gapped, it is best practice to verify the gap against your vehicle's specifications before installation.
The resistance helps minimize radio frequency interference (RFI) with your car's sensitive electronic sensors and audio systems.
Follow your vehicle manufacturer's recommended maintenance interval, though iridium plugs typically offer a longer service life than standard copper ones.
Ensure the ignition coil wire is fully seated and clicked into place on the plug terminal.
Verify the spark plug gap matches your vehicle's service manual requirements; shipping can occasionally alter the factory gap.
Stop immediately. Clean the cylinder head threads and ensure you are not cross-threading; never force a spark plug.
Before installation, always verify that your vehicle manual lists M12 x 1.25 threads and a 28mm thread length. Use a dedicated spark plug socket (16mm) to avoid damaging the ceramic insulator. Always use a torque wrench to tighten the plugs to your vehicle manufacturer's specified foot-pounds; overtightening can strip the cylinder head threads, while undertightening can cause combustion leakage. It is recommended to apply a very small amount of anti-seize compound to the threads if the manufacturer recommends it, though many NGK plugs come with a specialized plating that negates this need. Inspect the plugs every 20,000 to 30,000 miles to monitor for signs of fuel mixture issues.
