Denso Iridium Long Life Spark Plugs SK16R11 (4-Pack) — Genuine 3324, Precise Gap

DENSO 3324 Iridium Long Life spark plugs (SK16R11) are a genuine 4-pack replacement designed to restore efficient ignition and long use between services.

This set contains four authentic DENSO 3324 spark plugs engineered for durable performance and consistent firing. Each plug uses iridium in the center electrode to resist wear and maintain a precise spark gap, while arriving in original packaging with all required hardware. These are direct-fit parts intended to replace worn or fouled plugs and are suitable for vehicles that list SK16R11 or DENSO 3324 as the specified part number. Always verify compatibility with your vehicle's fitment tool before installation.

How do these iridium plugs improve everyday driving?

Iridium electrodes are harder and thinner than conventional metals, keeping the gap more stable and allowing a stronger, more focused spark. That helps the ignition system combust fuel more consistently across starting, idling, and cruising conditions.

• Iridium-tipped center electrode for stable spark and slower wear
• Precise factory-set gap for predictable ignition performance
• Genuine DENSO manufacturing and quality control

Will these fit my vehicle and how do I confirm fitment?

These plugs are sold as DENSO part number 3324 (SK16R11) and are direct replacements when that number matches your vehicle’s service specification. Use your vehicle manufacturer’s parts guide or the online fitment checker provided by the retailer to confirm compatibility before purchase.

• Check your vehicle’s owner manual or dealer parts list for SK16R11
• Use the online fitment tool or VIN lookup where available
• Contact DENSO or your mechanic if fitment is uncertain

What should I expect during installation and maintenance?

Installation follows the same basic steps as other spark plugs, but use a torque wrench to avoid over-tightening and preserve the plug’s integrity. Replace spark plug wires or coils as needed and inspect surrounding components to ensure proper ignition performance.

• Hand-start each plug then torque to the vehicle manufacturer’s spec
• Apply anti-seize only if recommended by the vehicle maker
• Inspect ignition coils and boots for wear while replacing plugs

How long can I expect these DENSO plugs to last?

Iridium construction typically delivers extended service life compared with conventional plugs, helping stretch intervals between changes depending on driving conditions and engine tune. For precise replacement intervals, follow your vehicle maker’s recommended service schedule.

• Iridium tips resist erosion for longer gap life
• Actual lifespan varies with driving style and engine condition
• Follow manufacturer service interval recommendations

Who is this for: This 4-pack of DENSO 3324 (SK16R11) spark plugs is aimed at vehicle owners, DIY mechanics, and professional technicians who need a factory-quality replacement for compatible engines. Choose these plugs if you want a durable, direct-fit iridium option supplied in original DENSO packaging and hardware, and be sure to verify fitment against your vehicle’s specifications before installing.