NGK IFR5T-8N Laser Iridium Spark Plug (3508)
Original price was: £23.98.£15.48Current price is: £15.48.
NGK IFR5T-8N Iridium Spark Plug – Stock No. 3508
The NGK IFR5T-8N is a fine-wire iridium spark plug designed for clean, reliable ignition. It delivers a strong, stable spark that improves cold starts, throttle response and fuel consistency. Iridium resists wear, so performance stays steady over a long service life.
The iridium centre electrode needs less voltage to fire. This helps under load and at higher RPM, especially on engines with direct injection or turbocharging. A platinum-tipped ground electrode and built-in resistor reduce electrical noise and misfire risk.
Use this plug as an OE-quality replacement or when refreshing an engine before a remap. Heat range 5 keeps it suitable for many standard or lightly modified engines that specify this rating. Always match the heat range and design to your engine.
Confirm fitment using the vehicle lookup or the Vehicle Fitment tab before ordering.
| Specification | Detail |
|---|---|
| Part number | IFR5T-8N |
| NGK stock number | 3508 |
| Category | 686 – Spark Plug |
| GTIN | 087295135082 |
| Centre electrode | Fine-wire Iridium |
| Ground electrode | Nickel with platinum pad |
| Resistor | Yes |
| Heat range | 5 (NGK scale) |
| Factory gap | 0.8 mm |
| Seat type | Please check vehicle specification |
| Thread size | Please check vehicle specification |
| Reach | Please check vehicle specification |
| Hex size | Please check vehicle specification |
- Pre-gapped at 0.8 mm, but always verify gap for your engine. Avoid forcing the fine-wire tip.
- Fit using a torque wrench and the manufacturer’s torque spec to protect threads and ensure proper heat transfer.
Why choose this plug
– Strong, consistent spark for smoother idle and better response.
– Long life from iridium and platinum-tipped electrodes.
– Stable performance under load and at high temperature.
Fitment guidance
This plug suits engines that specify NGK IFR5T-8N or an equivalent NGK iridium in heat range 5 with a 0.8 mm gap. Use the site’s vehicle lookup to confirm, or check the Vehicle Fitment tab for full details.
The price displayed is for a single plug, please add the desired amount to your basket.
| Weight | 0.05 kg |
|---|---|
| Dimensions | 10 × 3 × 3 cm |
| Brand |
NGK-3508 Confirmed Fitment
Please note, this information is a combination of supplier provided compatibility data and our workshop expertise. While every effort has been made to ensure the accuracy of this information Progressive Parts Ltd are not liable for abnormalities or inaccurate data. Customers are wholly responsible for checking fitment for their vehicle. More information is available from our Terms & Conditions
UK Shipping
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Out of stock items are sourced from our extended inventory and supplier inventory where possible. These may require manufacturing or carry extended lead times which we endeavour to alert you about if the website hasn't already provided an estimated delivery timescale.
DELIVERY INFORMATION
International Shipping
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DELIVERY INFORMATION
Returns
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Stock at Progressive Parts
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What do our stock statuses mean?
1+ IN STOCK in green stock is readily available in one of our warehouses for express delivery (at the time of viewing).
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MADE TO ORDER in blue means we've partnered with a supplier which primarily makes their products to order. It's not on our shelf, but your order goes into production immediately.
0 IN STOCK in orange means everybody we work with is unfortunately out of stock. Stock is not available in the UK. The best course of action is to place an order to create an allocation from the next batch arriving.
OUT OF STOCK in red. This product is unavailable to order, for whatever reason we're unable to obtain stock or there is an issue with supply/lead times.
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Type-approval then, is a certain guarantee that an end user will receive a product of OE equivalent performance attributes.
Products on the Progressive Parts website that meet this approval will be clearly marked or labelled EC or ECE approved.