Denso 3128 Spark Plug

Reliable Ignition Performance for Select Vehicles

The Denso Double Platinum 3128 spark plug is engineered to deliver consistent ignition performance for a range of vehicles including Toyota Camry, Lexus RX330, and Mercedes-Benz C230. Designed with durable platinum electrodes and optimized resistance, this spark plug supports efficient combustion and engine reliability.

• Double platinum chip on ground electrode and platinum center electrode tip for enhanced durability
• 5000 ohm resistance to reduce electrical noise and protect ignition components
• Copper core center electrode for improved thermal conductivity
• Standard ground configuration with nickel ground electrode core
• Pre-gap size of 1.1 mm for precise spark delivery
• Flat seat type with 14 mm thread diameter and 19 mm reach for proper fitment
• Hex size of 16.0 mm for easy installation
• Manufacturer heat range of 20 suitable for moderate engine temperatures

About the Denso Double Platinum Spark Plug Line

The Double Platinum line from Denso features spark plugs with platinum on both the center and ground electrodes. This design enhances electrode durability and wear resistance compared to conventional plugs. The platinum chip on the ground electrode and platinum tip on the center electrode help maintain consistent spark gaps over time, contributing to stable engine performance and longer service intervals.

Technical Details and Compatibility

The Denso 3128 spark plug incorporates a copper core center electrode to improve heat dissipation and electrical conductivity. The nickel ground electrode core supports structural integrity, while the single ground electrode with a platinum chip tip ensures reliable spark generation. With a pre-gap size of 1.1 mm and a flat seat design, this spark plug fits vehicles requiring a 14 mm thread diameter and 19 mm reach.

This spark plug is compatible with various makes and models including Toyota 4Runner, Lexus ES300, Mercedes-Benz SLK55 AMG, and Volvo S60. It is suitable for secondary ignition systems in these vehicles, providing stable ignition and helping maintain engine efficiency.

Common Applications and Problem Resolution

• Replacement for worn or fouled spark plugs causing misfires
• Improves ignition stability in vehicles experiencing rough idling
• Helps restore fuel efficiency affected by inconsistent spark delivery
• Reduces ignition system electrical interference due to 5000 ohm resistance
• Supports smooth engine start and acceleration performance

Installation Notes and Tips

• Verify correct spark plug gap of 1.1 mm before installation
• Use a 16 mm socket wrench for proper torque application
• Ensure flat seat matches cylinder head design to prevent leaks
• Apply anti-seize compound sparingly on threads if recommended by vehicle manufacturer
• Follow vehicle-specific torque specifications to avoid damage

Quality Assurance and Warranty

Denso spark plugs are manufactured to meet strict quality standards for durability and performance. The Double Platinum 3128 spark plug undergoes rigorous testing to ensure consistent electrical resistance and electrode integrity. While specific warranty terms may vary, Denso products typically come with manufacturer-backed coverage against defects in materials and workmanship.