NGK Spark Plugs - #3672 - LFR6A11 - Sold Individually

Keep ignition performance consistent with the NGK LFR6A11 standard spark plug. Chosen by more automotive, motorcycle, and marine engine manufacturers than any other, NGK standard plugs are built around a proven copper core and precision electrode design that support fast starts, dependable combustion, and long service life.

This plug is designed to hold up in real-world use, with features that help prevent leakage, resist flashover, and protect threads during installation. If you are replacing worn plugs or doing routine service, the LFR6A11 is a reliable, OEM-trusted choice.

Key Features

• NGK standard spark plug design for consistent ignition performance
• Unique copper core and electrode design for fast starts and strong overall performance
• Triple gasket sealing process helps eliminate gas leakage past the shell
• 99% highly pure alumina silicate insulator for strength and heat resistance
• Solid copper core supports efficient heat transfer and durability
• Corrugated ribs help prevent flash over
• Cold rolled threads help prevent damage to the cylinder head
• Trivalent plating (silver chromate and zinc) for corrosion resistance
• NGK Part Number: 3672
• Plug Number: LFR6A11
• Sold: Individually

Why Replace Spark Plugs on Schedule

Spark plugs play a direct role in how cleanly and efficiently your engine runs. Replacing plugs at the recommended interval can help maintain smooth idle, consistent acceleration, and reliable starting. Fresh plugs also support better combustion, which can reduce misfires and help keep your engine running the way it should.

FAQs

• Is this spark plug sold individually?
  Yes. This listing includes 1 spark plug.
• What is the NGK part number?
  The NGK part number is 3672.
• What is the plug number?
  The plug number is LFR6A11.
• How do I confirm this is the correct plug for my engine?
  Match your existing plug number and confirm fitment using your engine manual or parts lookup before ordering.
• Should I replace spark plugs as a set?
  Many engines run best when plugs are replaced as a complete set. Follow your engine manufacturer’s service guidance for quantity and interval.