The DENSO W27ESR-U Spark Plug, manufacturer part number 4045, is designed to provide dependable ignition performance in compatible automotive applications. As an original equipment spark plug from DENSO, it supports consistent engine starting, efficient combustion, and reliable operation under normal driving conditions. The W27ESR-U model is built for applications requiring this specific plug design and heat range, making proper vehicle and engine fitment verification essential before installation.
Built with a copper core center electrode, this DENSO spark plug promotes superior thermal conductivity to help manage operating heat effectively. The plug is 100 percent pre-fired to help ensure reliable operation from installation. Its unique five-rib insulator helps reduce flashover and minimize voltage loss, supporting dependable spark delivery. A dual copper and glass seal bonds the center electrode and insulator together, creating a gas-tight seal for enhanced durability and consistent performance.
For correct fitment, compare the DENSO W27ESR-U model and manufacturer part number 4045 with the vehicle manufacturer’s specifications, engine requirements, and existing spark plug information. Installation should follow the recommended service procedures and spark plug gap specifications for the application. This DENSO original equipment spark plug is a practical replacement choice for maintaining the intended ignition performance of compatible automotive systems.
Features:
- Brand: DENSO
- Model: W27ESR-U
- Manufacturer part number: 4045
- Application: Original equipment automotive spark plug
- Ignition performance: 100 percent pre-fired for reliable operation
- Center electrode: Copper core for superior thermal conductivity
- Insulator design: Five ribs help reduce flashover and voltage loss
- Sealing construction: Dual copper and glass seal provides a gas-tight bond
- Fitment: Designed for compatible automotive applications; verify vehicle and engine specifications before installation