NGK Laser Iridium Spark Plugs set of 4 IZFR6K11 (6994) — fine iridium electrode, long-life replacement

These are genuine NGK Laser Iridium spark plugs (model IZFR6K11 / 6994) sold as a set of four, designed as direct replacement plugs for compatible gasoline engines.

NGK's Laser Iridium line pairs a fine iridium center electrode with precise manufacturing to provide reliable ignition, long service life, and consistent performance compared to conventional plugs. This listing is for a factory-original 4-pack that includes original packaging and the hardware you need for a straightforward swap—confirm vehicle compatibility with your fitment tool before purchase.

Will these NGK IZFR6K11 plugs fit my vehicle?

Compatibility depends on your engine's thread size, reach, heat range, and electrode type. NGK part number IZFR6K11 (also referenced as 6994) fits a range of OEM applications; always verify with your vehicle's service manual or the retailer's fitment checker to ensure an exact match.

• Part number: IZFR6K11 / 6994
• Sold as a set of four plugs
• Confirm thread size, reach, and heat range for your engine
• Use Amazon Confirmed Fit or dealer lookup to verify compatibility

How do Laser Iridium plugs perform compared with standard plugs?

Laser Iridium plugs use a very fine iridium center electrode for improved spark precision and durability. They generally offer longer service intervals and more stable ignition characteristics than conventional nickel plugs under normal driving conditions.

• Fine iridium center electrode for consistent spark
• High durability—iridium resists erosion better than nickel
• Improved ignition reliability during cold starts and steady operation
• Often recommended as OEM upgrades or replacement for modern engines

What comes in the box and how easy is installation?

The package contains four genuine NGK Laser Iridium spark plugs in their original packaging plus any small installation hardware included by NGK. Installation is straightforward for anyone comfortable with basic engine maintenance, but if you’re unsure, a professional technician can complete the swap quickly.

• Four NGK IZFR6K11 (6994) spark plugs in original packaging
• Included hardware as supplied by NGK
• Typical install: remove old plugs, gap check if needed, torque to spec
• Use proper torque and anti-seize guidelines for reliable seating

How long will these NGK plugs last and when should I replace them?

Laser Iridium plugs are built for longevity; many drivers see extended service intervals versus standard plugs, but actual lifespan varies with driving conditions and engine design. Follow your vehicle manufacturer’s recommended interval or inspect at routine service intervals to determine replacement timing.

• Longer life than conventional nickel plugs under normal use
• Replacement interval depends on vehicle maker guidelines
• Inspect plugs during tune-ups or if symptoms like misfires appear
• Proper installation helps achieve full service life

Who is this for: This set of NGK IZFR6K11 (6994) Laser Iridium spark plugs is intended for vehicle owners, mechanics, and DIY enthusiasts seeking a genuine OEM replacement with improved electrode durability. It’s suitable for drivers who want a dependable, long-lasting ignition component that meets manufacturer specifications—always verify fitment for your exact engine before purchasing.