# SILZKFR8E7S NGK Iridium Spark Plug | Genuine NGK Spark Plug

## 🔧 Product Description

**NGK Iridium Spark Plug – Part Number: SILZKFR8E7S**

NGK iridium spark plugs feature an iridium alloy on the centre electrode, welded on with a laser – one of the world's hardest metals, with a melting point of 2450°C, giving very high resistance to spark erosion and, on average, double the service life of a standard nickel spark plug.

## ⚙️ Key Features

-   Fine iridium-tipped centre electrode and platinum-tipped ground electrode for a slow wear rate, stable idle, improved fuel efficiency and lower emissions
-   Longer service life
-   Trivalent metal plating provides superior anti-corrosion and anti-seizing properties
-   Corrugated ribs reduce the risk of flashover
-   Pure alumina silicate ceramic insulator, providing superior strength and better heat transfer
-   Triple seals prevent leakage
-   Copper core aids in heat removal

## 📏 Specifications

-   NGK stock number: 90654
-   Thread: 12 mm
-   Reach: 26.5 mm (1.04 in)
-   Hex: 14 mm
-   Seat: Gasket
-   Terminal: Solid
-   Type: Extended Shell Extended Projected

## 🚘 Application

Listed in NGK's application charts for automotive vehicles.

-   Infiniti Q50 (2017-2016) – 4 per engine
-   Mercedes-Benz B250 (2013) – 4 per engine
-   Mercedes-Benz B250 (2017-2015) – 4 per engine
-   Mercedes-Benz C300 (2017-2015) – 4 per engine
-   Mercedes-Benz C350e (2017-2016) – 4 per engine
-   Mercedes-Benz CLA250 (2017-2014) – 4 per engine
-   Mercedes-Benz E300 (2017) – 4 per engine
-   Mercedes-Benz GLA250 (2017-2015) – 4 per engine
-   Mercedes-Benz GLC300 (2017-2016) – 4 per engine
-   Mercedes-Benz Metris (2017-2016) – 4 per engine
-   Mercedes-Benz SLC300 (2017) – 4 per engine
-   Mercedes-Benz SLK300 (2016) – 4 per engine

## 🔄 Supersession & Cross Reference

NGK's cross-reference tables list this plug against these part numbers.

-   Bosch: 7434

## 📦 Condition

-   Brand new genuine product
-   Supplied in original packaging

## Details

- **Price:** 38.0 AUD
- **Vendor:** NGK
- **Type:** Ignition & Controls

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 38.00 AUD | In stock |

## Images

- SILZKFR8E7S NGK iridium spark plug

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/silzkfr8e7s-ngk-iridium-spark-plug-genuine-ngk-spark-plug)
> Updated: 2026-09-03