Denso 3370 Spark Plug

Overview of Denso Iridium Long Life Spark Plug 3370

The Denso Iridium Long Life spark plug 3370 is engineered for reliable ignition performance in select BMW, Dodge, and Mazda vehicles. Designed with advanced materials, this spark plug supports efficient combustion and long service intervals for models like the BMW 750iL, 850Ci, Dodge Avenger, and Mazda Millenia.

• Iridium center electrode tip for enhanced durability
• Platinum chip ground electrode tip for stable spark
• Copper core center electrode for optimal conductivity
• Standard ground configuration with nickel core ground electrode
• Pre-gap size of 0.8 mm for precise ignition timing
• Flat seat type with 14 mm thread diameter and 19 mm reach
• Hex size of 16 mm for easy installation
• Manufacturer heat range of 16 suitable for specified vehicles
• Resistance rating of 5000 ohms to reduce electrical noise

Detailed Features and Specifications

This Denso spark plug 3370 features an iridium tip on the center electrode, which provides a fine electrode point for consistent spark and extended wear life. The copper core center electrode enhances thermal conductivity, helping to dissipate heat effectively. The ground electrode incorporates a platinum chip tip, improving spark stability and reducing electrode wear. The nickel core material in the ground electrode ensures durability under high temperatures. With a pre-gap size of 0.8 mm and a single ground electrode, this spark plug maintains reliable ignition performance. The flat seat design and 14 mm thread diameter with a 19 mm reach ensure proper fitment and sealing in compatible engines.

Iridium Long Life Product Line

The Iridium Long Life line from Denso focuses on delivering extended service intervals and consistent ignition performance. This product line utilizes iridium and platinum materials to reduce electrode wear and maintain stable spark characteristics over time. The 3370 spark plug benefits from this technology, making it suitable for vehicles requiring durable ignition components, such as the BMW 750iL and Dodge Avenger.

Compatible Vehicles and Applications

• BMW 750iL and 850Ci models requiring secondary ignition spark plugs
• Dodge Avenger with specified ignition system needs
• Mazda Millenia engines compatible with 14 mm thread diameter plugs

Common Issues Addressed by This Spark Plug

• Misfires caused by worn or degraded spark plugs
• Reduced fuel efficiency due to inconsistent ignition
• Hard starting or rough idling in compatible vehicles
• Ignition noise interference minimized by 5000 ohm resistance
• Premature electrode wear in high-heat engine conditions

Installation Notes and Tips

Ensure the engine is cool before removing old spark plugs. Use a torque wrench to tighten the Denso 3370 spark plug to manufacturer specifications to avoid damage. Verify the pre-gap size of 0.8 mm before installation, adjusting if necessary. The 16 mm hex size allows for standard spark plug socket use. Confirm compatibility with your vehicle’s make and model to ensure proper fitment.

Quality Assurance and Warranty

Denso manufactures the 3370 spark plug to meet OEM standards for fit, form, and function. The use of iridium and platinum materials supports long service life and consistent performance. While specific warranty details may vary, Denso products typically come with manufacturer-backed quality assurance to support reliability in secondary ignition applications.