Denso 3372 Spark Plug

Reliable Ignition Performance for INFINITI, Mazda, and Nissan Vehicles

The Denso Iridium Long Life spark plug 3372 is engineered to provide consistent ignition and enhanced durability for select INFINITI, Mazda, and Nissan models. Designed with advanced materials and precise specifications, this spark plug supports efficient combustion and reliable engine operation.

• Iridium center electrode tip for improved ignition and longevity
• Platinum chip ground electrode tip for stable spark and wear resistance
• Thick nickel ground electrode core for durability
• Copper center electrode core for optimal conductivity
• Pre-gap size of 1.1 mm for precise spark gap
• Flat seat type with 14 mm thread diameter and 19 mm reach
• Hex size of 16.0 mm for standard installation tools
• Manufacturer heat range 22 suitable for specified vehicle applications
• Resistance rating of 5000 ohms to reduce electrical noise

About the Denso Iridium Long Life Product Line

The Iridium Long Life series by Denso focuses on delivering extended service intervals and consistent ignition performance. Utilizing iridium and platinum materials in the electrode tips, these spark plugs are designed to resist wear and maintain stable combustion over time. The 3372 part number exemplifies this approach with a combination of iridium center electrode and platinum chip ground electrode, supporting durability and efficient engine operation in compatible vehicles.

Technical Details and Compatibility

This spark plug features a copper core center electrode for excellent thermal conductivity, paired with an iridium tip to withstand high temperatures and reduce electrode erosion. The ground electrode uses a thick nickel core with a platinum chip tip, enhancing durability and spark stability. The flat seat design and 19 mm reach ensure proper fitment and sealing in the combustion chamber. With a resistance of 5000 ohms, it helps minimize electromagnetic interference with vehicle electronics.

Compatible with various INFINITI, Mazda, and Nissan models including Altima, B2300, Frontier, G20, Sentra, and Xterra, the Denso 3372 spark plug meets the specific ignition requirements of these vehicles.

Common Applications and Problem Resolution

• Replacing worn or fouled spark plugs to restore engine performance
• Addressing misfires and rough idling in compatible INFINITI, Mazda, and Nissan models
• Improving fuel efficiency by ensuring consistent spark delivery
• Reducing ignition system electrical noise with 5000 ohm resistance
• Extending maintenance intervals with durable iridium and platinum electrode materials

Installation Notes and Tips

Ensure the spark plug gap is set to the specified pre-gap size of 1.1 mm before installation. Use a 16 mm socket wrench for proper torque application. The flat seat design requires careful seating to avoid combustion chamber leaks. Follow vehicle manufacturer torque specifications to prevent damage to the spark plug or cylinder head. It is recommended to replace spark plugs in sets to maintain balanced engine performance.

Quality Assurance and Warranty

Denso spark plugs are manufactured to meet strict quality standards and OEM specifications. The Iridium Long Life 3372 spark plug undergoes rigorous testing for durability and performance. While specific warranty details may vary, Denso products typically come with a limited warranty covering defects in materials and workmanship under normal use.