NGK LTR6B-10T Spark Plug – Stock No. 5948
This NGK spark plug delivers a strong, consistent spark for smooth idling, reliable starts, and clean combustion. It uses a resistor to cut electrical noise that can affect sensors and the ECU. The long-reach M12 body suits many modern aluminium cylinder heads, helping heat transfer and durability.
A factory-set 1.0 mm gap and NGK heat range 6 make it a dependable choice for everyday performance and light tuning. If running high boost or heavy track use, you may need a colder heat range.
- Stable ignition for better throttle response and efficiency
- Resistor design reduces interference with vehicle electronics
| Part Number | LTR6B-10T |
| NGK Stock Number | 5948 |
| Part Category | 686 – Spark Plug |
| GTIN | 087295159484 |
| Thread Diameter | M12 |
| Thread Pitch | 1.25 |
| Reach (thread length) | 26.5 mm |
| Seat Type | Tapered |
| Hex Size | 14 mm |
| Heat Range | 6 (NGK scale) |
| Resistor | Yes (R) |
| Factory Gap | 1.0 mm (-10) |
| Terminal | Solid |
| Centre Electrode | Copper core, nickel alloy tip |
| Ground Electrode | Nickel alloy |
Fitment guidance
Often used in modern petrol engines that take long-reach M12 plugs. Always confirm compatibility with the site’s vehicle lookup or the Vehicle Fitment tab before ordering.
Installation notes
– Check and adjust the gap only if your manufacturer specifies a different setting.
– Fit to a cold engine and tighten to the vehicle maker’s torque spec.
– Use a small amount of clean engine oil on the threads if specified; avoid anti-seize unless the manufacturer permits it.
The price displayed is for a single plug, please add the desired amount to your basket.


