Denso Iridium Spark Plugs SK16HR11 (6-Pack) Long-Life Fine-Tip OEM Fit

Denso 3417 (SK16HR11) iridium spark plugs — a 6-piece set engineered for longer service life and consistent ignition performance.

This listing contains one genuine Denso 3417 spark plug pack with six SK16HR11 iridium electrodes. Built for reliable combustion and extended durability, these plugs are made to meet OEM fit and function standards. They suit scheduled maintenance or full-plug replacement when you want a direct-fit, high-quality ignition component without aftermarket guessing.

How do these Denso plugs differ from standard copper or nickel plugs?

Iridium is a much harder, higher-melting-point metal than copper or nickel, which lets Denso produce a much finer central electrode. A thinner electrode creates a more focused spark path, improving ignition reliability across operating conditions.

• Iridium center electrode for stable spark and longer wear
• Fine-tipped design reduces voltage demand from ignition coils
• Robust construction resists erosion and maintains gap tolerance

Will these spark plugs fit my vehicle and are they direct replacements?

The Denso 3417 is manufactured to the SK16HR11 specification, commonly used as a direct-fit replacement for applications calling for that code. Check your owner’s manual or parts guide for SK16HR11 compatibility to confirm fit, thread size, and reach before purchase.

• SKU: Denso 3417 — part code SK16HR11
• Sold as a 6-piece set for complete-bank service
• Meets Denso OEM fitment standards for listed applications

How long can I expect these iridium plugs to last under normal driving?

Iridium plugs are designed for extended service intervals compared with conventional plugs, often lasting tens of thousands of miles when installed and gapped correctly. Actual life depends on engine condition, driving habits, and maintenance practices like proper torque and heat-range selection.

• Longer electrode life versus copper/nickel alternatives
• Consistent performance across varied operating temperatures
• Replace based on manufacturer interval or when symptoms appear

What installation tips should I follow to get the best results?

Proper installation preserves plug life and engine performance: use a torque wrench to the vehicle maker’s specification, verify the gap if required, and apply anti-seize only where recommended. Avoid cross-threading and handle the ceramic insulator carefully to prevent cracks.

• Torque to factory spec to protect threads and ensure sealing
• Inspect gap only if specified; Denso often ships correctly gapped
• Replace all plugs in the bank for uniform performance

Who is this for: Technicians, DIY enthusiasts, and vehicle owners seeking a dependable, OEM-quality iridium spark plug replacement. The Denso 3417 (SK16HR11) 6-pack suits routine maintenance, full-engine plug changes, or anyone upgrading from standard plugs to extend service intervals and maintain reliable ignition performance.