NGK Iridium IX Spark Plugs CR8EIX (4218) Set of 2 — Direct-Fit, Long-Life Ignition

Genuine NGK Iridium IX CR8EIX (4218) spark plug set — a 2-piece direct replacement engineered for longer life, reliable ignition and stable performance.

These NGK Iridium IX plugs (part CR8EIX, OE 4218) come as an authentic two-piece set packaged with original hardware. Designed for vehicles that require an iridium-tipped electrode, this pair replaces worn or fouled plugs to restore ignition consistency and help maintain engine responsiveness. They are sold as genuine NGK components and are intended to match factory fitment when your vehicle specifies CR8EIX.

How will these plugs affect everyday driving?

Iridium electrodes are made for sustained spark reliability, which can translate into easier starts and steadier idling during normal use. While outcomes vary by vehicle and condition, many drivers notice smoother throttle response and more uniform combustion compared with worn plugs.

• Crystal-fine iridium tip for a concentrated spark
• Improved ignition stability under typical driving loads
• Direct-fit design to replace OEM CR8EIX plugs

Why choose NGK Iridium IX instead of standard plugs?

NGK’s Iridium IX series uses a harder, higher-melting-point alloy at the center electrode, which resists wear better than conventional nickel electrodes. That longevity can mean longer service intervals and more consistent performance over time.

• Durable iridium center electrode reduces erosion
• Designed to maintain gap and spark focus longer
• Manufactured to NGK quality and tolerances for reliable fit

Will these plugs fit my vehicle and what comes in the box?

This listing is for a 2-piece NGK Iridium IX CR8EIX (4218) set; verify compatibility using your vehicle’s specifications or a fitment tool. Each package ships with the original NGK packaging and necessary hardware included by the manufacturer.

• Two NGK Iridium IX CR8EIX (4218) spark plugs per set
• Original NGK packaging and factory-supplied hardware
• Confirm fitment with your vehicle’s make/model and NGK references

How should these spark plugs be installed and maintained?

Install with the correct torque and gap settings per your vehicle manufacturer; improper installation can damage the plug or cylinder head. Periodic inspection during scheduled maintenance helps detect fouling or abnormal wear early.

• Use a torque wrench to NGK/manufacturer torque spec
• Check and set gap only if recommended by vehicle service manual
• Inspect periodically for deposits, wear, or electrode damage

Who is this for: This NGK Iridium IX CR8EIX (4218) two-pack is for drivers and mechanics seeking an OEM-quality iridium spark plug as a direct replacement for vehicles that specify CR8EIX. It suits owners who prefer genuine NGK parts for reliable fitment, longer electrode life than standard plugs, and straightforward swap-in service during routine tune-ups.