The DENSO IW20 Iridium Spark Plug, manufacturer part number 5306 and vendor part number 5306, is engineered to provide dependable ignition performance for compatible automotive and powersports applications. Its iridium electrodes withstand temperatures up to 4,000°F, helping the plug maintain durability and consistent operation under demanding engine conditions. The fine iridium electrode design also helps reduce voltage requirements while supporting reliable spark formation.
DENSO uses 360-degree laser welding to secure the electrode and create a wear-resistant seal designed for demanding environments. The tapered-cut ground electrode and U-groove configuration create a larger volume area around the flame center, supporting efficient combustion and stable ignition. This design can contribute to smooth engine operation and dependable starting when the plug is correctly matched to the application.
Fitment varies by vehicle, engine, and application. Verify the DENSO IW20 model and part number 5306 against the original equipment specification or an authoritative application guide before installation. This spark plug is intended as a direct replacement for compatible applications and should be installed using the vehicle manufacturer’s recommended procedures and gap specifications. The product is sold as an individual spark plug.
Features:
- Brand: DENSO
- Model: IW20
- Manufacturer part number: 5306
- Vendor part number: 5306
- Electrode material: Iridium
- Temperature resistance: Supports operating temperatures up to 4,000°F
- Electrode design: Fine iridium electrode helps reduce voltage requirements and improve firing performance
- Welding construction: 360-degree laser-welded electrode seal resists wear in demanding conditions
- Ground electrode: Tapered-cut design with a U-groove creates a larger flame-center volume area
- Fitment: Compatible with select automotive and powersports applications; verify application-specific fitment before installation