Denso 3539 Spark Plug

Reliable Ignition Performance for Select GM and Isuzu Vehicles

The Denso Iridium Long Life spark plug, part number 3539, is engineered to deliver consistent ignition performance for a range of vehicles including Buick, Cadillac, Chevrolet, GMC, and more. Designed with durable materials and precise specifications, this spark plug supports efficient combustion and engine reliability.

• Iridium center electrode tip for enhanced durability and ignition
• Platinum chip ground electrode tip for stable spark and wear resistance
• Copper core center electrode for optimal conductivity
• Standard ground configuration with a single ground electrode
• Pre-gap size of 1.0 mm for precise spark gap
• Tapered seat type ensuring proper fit and sealing
• Thread diameter of 14.00 mm and reach of 25.00 mm for correct installation depth
• Hex size of 16.0 mm for standard tool compatibility
• Manufacturer heat range rating of 16 for balanced heat dissipation
• 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 extending spark plug service intervals while maintaining reliable ignition. Utilizing iridium and platinum materials, this product line offers improved electrode wear resistance and stable performance under various driving conditions. Part number 3539 is a representative spark plug within this line, combining advanced materials with precise engineering to meet the demands of secondary ignition systems.

Technical Details and Application

This spark plug features a copper core center electrode with an iridium tip, which enhances electrical conductivity and durability. The ground electrode incorporates a platinum chip tip and nickel core material, providing a stable spark and resistance to electrode wear. The standard ground configuration with a single electrode supports consistent ignition, while the tapered seat ensures a secure fit in the combustion chamber. The 1.0 mm pre-gap size is factory set to optimize spark efficiency and combustion.

Compatible Vehicles and Use Cases

• Compatible with Buick, Cadillac, Chevrolet, GMC, Hummer, Isuzu, Oldsmobile, Pontiac, Saab, and Saturn models
• Suitable for vehicles such as Chevrolet Camaro, Silverado 1500, Cadillac Escalade, GMC Sierra 2500 HD, and Isuzu Ascender
• Addresses ignition misfires and rough idling issues
• Helps improve fuel efficiency and engine responsiveness
• Reduces spark plug fouling and electrode wear over time

Installation Notes and Tips

Ensure the spark plug gap is checked before installation, although the pre-gap size is factory set at 1.0 mm. Use a 16 mm socket wrench for proper tightening to the manufacturer’s torque specifications. Confirm compatibility with your vehicle’s make and model, especially for GM and Isuzu applications listed. Avoid over-tightening to prevent damage to the tapered seat or threads.

Quality Assurance and Warranty

Denso manufactures this spark plug to meet OEM standards for ignition components. The use of iridium and platinum materials contributes to long service life and consistent performance. While specific warranty details are not provided, Denso products typically adhere to strict quality control processes to ensure reliability in secondary ignition systems.