NGK Iridium IX Spark Plug – BCPR6EIX (Stock No. 5689)
The NGK BCPR6EIX is a fine-wire iridium spark plug designed for stable ignition and long service life. It offers reliable cold starts, smooth idle, and consistent performance, even under hard use. The iridium centre electrode needs less voltage to fire, which helps reduce misfires and keeps combustion clean. It will not add power on its own, but it helps your engine deliver what it should, lap after lap or mile after mile.
Use this plug where your engine specifies this exact type and heat range. If your vehicle is tuned or runs higher boost, you may need to adjust the gap within the manufacturer’s recommended range.
Why choose this plug
- Fine-wire iridium tip for strong spark and stable combustion
- Projected tip for efficient flame spread and good drivability
- Resistor design to reduce electrical noise that can affect the ECU
- Durable ground electrode and trivalent coating to resist corrosion
| Part number | BCPR6EIX |
|---|---|
| NGK stock number | 5689 |
| GTIN | 087295156896 |
| Category | 686 – Spark Plug |
| Thread diameter | 14 mm |
| Thread reach | 19 mm |
| Hex size | 16 mm (5/8″) |
| Seat type | Gasket |
| Heat range | 6 (NGK scale) |
| Resistor | Yes |
| Centre electrode | Iridium, approx. 0.6 mm fine wire |
| Ground electrode | Nickel alloy, taper-cut |
| Projected tip | Yes (P code) |
| Factory gap | 0.8 mm (check and adjust if specified by your engine) |
| Terminal | Removable nut |
| Recommended torque | 18-25 Nm (14 mm gasket seat) |
Fitment guidance
Only use if your engine calls for a 14 mm, 19 mm reach, gasket-seat plug in NGK heat range 6 with a projected tip. For exact compatibility, use the vehicle lookup on our site or check the Vehicle Fitment tab.
Important: Do not force-gap the fine iridium tip. Always torque to spec on a cold engine and use a new gasket.
The price displayed is for a single plug, please add the desired amount to your basket.


