NGK DIFR5C Spark Plug – Stock No. 90911
The NGK DIFR5C is a high-quality iridium spark plug designed for reliable spark and long service life. It uses a fine-wire iridium centre for strong ignition and a platinum-tipped ground for consistent performance over time. The built-in resistor reduces electrical noise that can affect the radio or ECU.
This plug is ideal for fast road use and lightly tuned engines. It helps cold starts, smooth idle, and clean throttle response. It also holds its gap well under heat and load, which helps maintain performance between services.
Use our vehicle lookup to confirm fitment, or check the Vehicle Fitment tab for full details.
| Part Number | DIFR5C |
| NGK Stock Number | 90911 |
| GTIN | 87295909119 |
| Category | 686 – Spark Plug |
| Series/Type | Laser Iridium |
| Centre Electrode | Fine-wire iridium tip |
| Ground Electrode | Platinum pad |
| Resistor | Yes |
| Heat Range (NGK) | 5 |
| Spark Gap | Factory set – follow vehicle spec |
- Strong spark for clean combustion and better response.
- Stable idle and easier cold starts.
- Long life thanks to iridium and platinum wear surfaces.
- Resistor design cuts interference with electronics.
Tip: Always check and adjust gap to the vehicle manufacturer’s specification if required.
The price displayed is for a single plug, please add the desired amount to your basket.


