Denso 5309 Spark Plug

Overview of Denso Iridium Power Spark Plug 5309

The Denso Iridium Power 5309 spark plug is engineered for precision ignition performance in select BMW models. Designed to meet the specific requirements of BMW M3, Z3, and Z4 vehicles, this spark plug offers reliable ignition and efficient combustion.

• Iridium center electrode tip for enhanced durability
• Tapercut, u-groove ground electrode tip design
• Nickel ground electrode core material with standard ground configuration
• Copper center electrode core for optimal conductivity
• Pre-gap size of 0.9 mm and flat seat type
• Hex size of 16.0 mm and thread diameter of 12.0 mm
• Manufacturer heat range of 24 and 19.00 mm reach
• Resistance rating of 5000 ohms

Detailed Product Features and Specifications

The Denso Iridium Power 5309 spark plug features a fine iridium tip on the center electrode, which provides a stable and consistent spark for improved ignition. The copper core center electrode enhances thermal conductivity, helping to dissipate heat effectively. The ground electrode uses a nickel core with a tapercut and u-groove tip design, which supports efficient spark exposure and combustion. With a pre-gap size of 0.9 mm and a flat seat type, this spark plug ensures proper sealing and optimal spark gap for BMW engines. The 16.0 mm hex size and 12.0 mm thread diameter make installation straightforward for compatible vehicles. The heat range of 24 is calibrated to suit the thermal demands of BMW M3, Z3, and Z4 models, ensuring reliable performance under various driving conditions.

About the Iridium Power Product Line

Denso's Iridium Power line focuses on delivering spark plugs with iridium-tipped electrodes that provide enhanced durability and consistent ignition performance. The 5309 spark plug benefits from this technology by combining iridium's high melting point with copper's conductivity, resulting in improved combustion efficiency and longer service life compared to conventional plugs. This product line is designed to meet the demands of performance-oriented vehicles like the BMW M3, Z3, and Z4.

Compatible Vehicles and Common Applications

• Designed for BMW M3 models requiring precise ignition components
• Compatible with BMW Z3 for improved engine responsiveness
• Suitable for BMW Z4 to maintain optimal combustion efficiency
• Addresses ignition misfires and rough idling issues
• Helps reduce engine hesitation and improve fuel efficiency

Installation Notes and Tips

When installing the Denso Iridium Power 5309 spark plug, ensure the pre-gap is set to 0.9 mm if adjustment is necessary. Use a torque wrench to tighten the spark plug to the manufacturer’s specifications to avoid damage to the threads or improper sealing. The flat seat design requires proper seating to prevent compression leaks. It is recommended to inspect the ignition system and replace spark plugs in sets for consistent engine performance.

Quality Assurance and Warranty

Denso manufactures the Iridium Power 5309 spark plug to meet strict OEM standards, ensuring reliable performance and durability. The use of high-quality materials such as iridium and copper contributes to the longevity of the spark plug. While specific warranty details may vary, Denso products typically come with a limited warranty covering defects in materials and workmanship.