DENSO 4129 Standard Spark Plug U-Groove Design

The DENSO 4129 is a standard copper core spark plug engineered to deliver reliable ignition performance for a wide range of vehicles. This spark plug features DENSO's innovative U-Groove ground electrode design, which creates a larger and more concentrated spark compared to conventional spark plugs.

Key Features:

• U-Groove ground electrode technology for improved ignitability and combustion efficiency
• Copper core construction provides excellent heat dissipation and thermal conductivity
• 14mm thread diameter with standard reach for broad vehicle compatibility
• Precision-machined electrodes ensure consistent performance and extended service life
• Trivalent metal plating resists corrosion and thread seizure
• OEM-quality construction meets or exceeds original equipment specifications

The U-Groove design concentrates the spark energy at the electrode tip, promoting more complete fuel combustion, which can result in improved throttle response, better fuel economy, and reduced emissions. DENSO's rigorous manufacturing standards ensure reliable cold starts and consistent firing under all operating conditions.