Denso 5306 Spark Plug

Denso Iridium Power Spark Plug 5306

Denso Iridium Power spark plug 5306 is built for drivers who want precise ignition performance and OE-style fitment across a wide range of import and domestic applications. It uses a 0.4 mm iridium center electrode to promote efficient spark delivery, with a tapered cut and U-groove ground electrode design for consistent flame initiation.

The Iridium Power line focuses on compact electrode geometry and stable electrical performance. With a 5000 ohm resistor, copper core center electrode, nickel ground electrode core, and a flat seat design, this plug is engineered for dependable ignition service in vehicles such as the Honda Accord, Mitsubishi Eclipse, and Volkswagen Golf.

Key Features

• Part number 5306 from Denso Iridium Power
• 0.4 mm iridium center electrode for fine-wire spark delivery
• Tapered cut and U-groove ground electrode tip design
• 5000 ohm resistor for ignition system noise control
• Copper core center electrode and nickel ground electrode core
• 1.1 mm pre-gap size, flat seat, 14.00 mm thread diameter
• Compatible with a broad range of import and domestic engine applications

Detailed Description

Denso 5306 is an iridium spark plug designed around a small-diameter center electrode to concentrate spark energy and support consistent combustion. The 20.6 mm hex size, 19.00 mm reach, and manufacturer heat range 20 provide the dimensional and thermal specifications needed for direct replacement in many older and performance-oriented engines. This plug cross-references DENSO Auto Parts IW20 for the same application.

Compatible With fitment includes 1990-1999 Mitsubishi Eclipse, 1987-1994 Mitsubishi Precis, 1987-1994 Hyundai Sonata, 1990-1992 Volkswagen Golf, and 1987-1989 Porsche 944. Additional coverage extends to vehicles such as the Honda Accord, Volvo 740, and Mazda B2200, making this a practical choice when searching for a Denso Iridium Power spark plug 5306 for specific year-make-model applications.

What It Helps Address

• Rough idle caused by worn or inconsistent spark plugs
• Hard starting from weakened ignition performance
• Misfire complaints related to degraded plug electrodes
• Reduced throttle response from inefficient combustion
• Maintenance replacement for aging ignition service intervals

Installation Notes and Tips

Verify thread diameter, reach, seat type, and heat range against the engine specification before installation. Check the pre-gap against the vehicle service information and adjust only if the application calls for it. Inspect ignition wires, coils, and plug wells for wear or contamination so the new plug can perform as intended.

For fitment-specific searches, this plug is commonly referenced for Honda Accord, Mitsubishi Eclipse, and Volkswagen Golf applications, along with many other import models listed in the fitment data.

Quality Assurance

Denso manufactures the Iridium Power line with a fine-wire iridium center electrode and application-specific construction details intended to support stable ignition performance and long service life in properly matched engines.