Denso Iridium Long Life Spark Plugs SC20HR11 (3444) 4-Pack — Iridium Tip, Direct-Fit Replacement

These DENSO 3444 (SC20HR11) spark plugs arrive as a 4-pack of original equipment replacement parts, built with iridium-tipped electrodes for improved durability and stable combustion. Supplied in manufacturer packaging with the correct hardware, they’re intended as a direct-fit replacement for compatible vehicles — verify compatibility with your vehicle’s fitment tool before installation.

How do these iridium spark plugs improve engine reliability?

The SC20HR11 uses a fine iridium center electrode that resists wear better than conventional materials, helping sustain a sharp spark over many miles. Stable ignition reduces misfires and supports smoother idle and throttle response without changing your engine’s setup.

• Iridium-tipped center electrode for extended life
• Precise electrode geometry for consistent spark delivery
• Durability that helps maintain performance between service intervals

What comes in the package and is this a direct replacement?

This listing includes four genuine DENSO spark plugs (part number 3444 / SC20HR11) in original packaging, plus any supplied hardware. They are designed as direct replacements; still check make, model, year, and engine code to confirm fitment for your specific vehicle.

• Four DENSO SC20HR11 spark plugs in manufacturer packaging
• Original hardware included where applicable
• Direct replacement part — verify fit with vehicle compatibility tool

How should I install and maintain these spark plugs?

Install DENSO spark plugs using the correct torque settings from your vehicle manufacturer and apply anti-seize only if recommended for your engine. Inspect ignition components periodically and replace plugs according to your vehicle’s maintenance schedule or sooner if performance issues arise.

• Use manufacturer-specified torque to avoid overtightening
• Replace per vehicle maintenance intervals or when signs of wear appear
• Follow OEM guidance on anti-seize and gap settings

Are these spark plugs suitable for performance or daily driving?

Denso iridium plugs balance longevity and consistent spark quality, making them suitable for everyday commuting as well as spirited driving where reliable ignition matters. They do not require engine modification and are intended to match original equipment specifications.

• Ideal for daily-driven vehicles and spirited use
• No vehicle modification required — direct OE-style fit
• Helps maintain factory performance characteristics

Who this is for: Mechanics, DIY car owners, and fleet managers seeking a genuine OEM-quality replacement plug will find the DENSO SC20HR11 (3444) 4-pack a practical choice. If you need long-lasting ignition components that match factory specifications and prefer genuine DENSO parts, this set provides a straightforward, compatible solution — just confirm vehicle fitment before purchase.