NGK Iridium Spark Plugs CR8EIX Pack of 4 — Long-Life Iridium Electrode, Stable Ignition

The NGK Iridium CR8EIX spark plug pack of four is a high-performance iridium electrode plug designed to deliver reliable ignition, improved throttle response, and extended service life for compatible petrol engines.

This genuine NGK Iridium IX set (part number 4218) contains four original replacement spark plugs engineered for consistent combustion and minimal wear. Iridium’s fine center electrode lowers required voltage and resists erosion, helping maintain a steady spark over many miles. These plugs are commonly chosen for vehicles where ignition stability, efficient fuel burn, and long intervals between replacements matter.

How does the CR8EIX improve ignition stability?

The CR8EIX uses a very fine iridium center electrode that creates a concentrated spark with lower voltage demand, promoting a more complete combustion event. That concentrated spark reduces misfires and helps the engine start more consistently in varied conditions.

• Iridium center electrode for precise spark delivery
• Factory-specified gap for reliable firing
• Reduced electrode wear for longer service life

Will these plugs fit my vehicle and how do I confirm compatibility?

NGK provides a parts catalog and online lookup to confirm fit by make, model, year, and engine code. Always cross-check the CR8EIX (NGK 4218) against your owner’s manual or NGK’s compatibility list before purchase to ensure correct thread size, reach, and heat range.

• Part number: NGK 4218 – CR8EIX
• Verify thread size, hex size, and reach with vehicle specs
• Use NGK or dealer lookup for final confirmation

What maintenance benefits can I expect from iridium plugs?

Iridium’s hardness and high melting point make the electrode resistant to erosion, so the plug maintains its gap and performance longer than plain nickel plugs. That longevity means fewer replacements and more consistent fuel combustion over extended mileage.

• Longer service intervals compared with conventional plugs
• Stable electrode gap preserves ignition timing and efficiency
• Reduced deposit build-up for steady performance

How should I install and care for the NGK CR8EIX plugs?

Install using the correct torque specification for your engine to avoid damage to the plug or cylinder head. Inspect ignition coils and boots during replacement, and re-check torque after initial heat cycles for best reliability.

• Hand-start then torque to vehicle manufacturer specs
• Replace related ignition components if worn (boots, coils)
• Check for proper gap only if specified by the service manual

Who is this for: This NGK Iridium CR8EIX pack of four is suited to car owners, DIY mechanics, and professional technicians seeking original-equipment replacement plugs that balance dependable performance with long life. It’s ideal for drivers who want consistent starting, steady throttle response, and fewer spark plug changes, provided the CR8EIX matches the vehicle’s specified plug requirements.