NGK DILKAR8R9HS Laser Iridium Spark Plug – 91510
The NGK DILKAR8R9HS is a premium iridium spark plug designed for reliable ignition under high load and temperature. It delivers a strong, consistent spark for smooth idle, crisp throttle response, and dependable performance in standard and tuned petrol engines.
This plug uses a fine iridium centre tip with a platinum ground pad. This reduces wear and helps maintain the correct gap for longer service life. It is a resistor type to control electrical noise that can affect sensors and the ECU.
Use this plug where an NGK heat range 8 iridium plug with a 0.9 mm gap is specified. It suits many modern direct-injection and turbo petrol engines. Always confirm with our vehicle lookup or check the Vehicle Fitment tab.
| Part Number | DILKAR8R9HS |
| NGK Stock Number | 91510 |
| GTIN | 0087295915103 |
| Category | 686 – Spark Plug |
| Type | Laser Iridium (Iridium centre, Platinum ground) |
| Thread Size | M12 x 1.25 |
| Reach (thread length) | 26.5 mm |
| Hex Size | 14 mm |
| Seat Type | Flat seat with gasket |
| Resistor | Yes |
| Projected Tip | Yes |
| Heat Range | 8 (NGK scale) |
| Factory Gap | 0.9 mm |
| Terminal | Solid (fixed) |
| Centre Electrode | Fine-wire iridium |
| Ground Electrode | Nickel with laser-welded platinum pad |
- Stronger, cleaner spark for smoother running and better cold starts.
- Stable performance under boost and high cylinder pressure.
- Long service life thanks to iridium and platinum wear surfaces.
- Resistor design helps prevent interference with electronics.
Note: Always install to the vehicle manufacturer’s torque specification. If adjustment is needed, handle the fine iridium tip with care and do not pry on the centre electrode.
The price displayed is for a single plug, please add the desired amount to your basket.


