# ZFR6FIX-11 NGK Iridium Spark Plug | Genuine NGK Spark Plug

## 🔧 Product Description

**NGK Iridium Spark Plug – Part Number: ZFR6FIX-11**

Iridium NGK spark plugs offer a longer service life than a standard nickel-tipped spark plug: while nickel-alloy plugs offer a service life of roughly 20,000-40,000km, NGK Iridium IX spark plugs offer a service life of up to 60,000km, so fewer replacements are needed over time despite the higher initial cost.

Precious-metal spark plugs like the NGK Iridium IX also offer higher ignitability, achieved with an exposed fine-tip centre electrode that promotes superior flame growth compared with a standard spark plug. Iridium has a much higher melting point (2410°C) than nickel (1453°C), allowing the centre electrode diameter to be reduced from 2.5mm to 0.6mm – a smaller electrode mass that reduces the impedance to flame progress, helping acceleration, fuel consumption and idle quality.

## ⚙️ Key Features

-   Fine iridium-tipped centre electrode for a slow wear rate and stable idle
-   Longer service life than standard nickel plugs
-   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
-   Copper core aids in heat removal
-   Triple seals prevent leakage

## 📏 Specifications

-   NGK stock number: 6441
-   Thread: 14 mm
-   Reach: 19 mm (3/4 in)
-   Hex: 16 mm (5/8 in)
-   Seat: Gasket
-   Terminal: Solid
-   Type: ISO Extended Projection Wide Gap

## 🚘 Application

Listed in NGK's application charts for marine, motorcycle, ATV and snowmobile equipment and automotive vehicles. The chart shows a 1.0 mm gap for these engines, but check it against your engine's manual before fitting.

-   Nissan NSD 90A (90 HP, 2008-2004) – Outboard Engine
-   Nissan NSD 90A2 (90 HP) – Outboard Engine
-   Nissan NSD 70A (70 HP, 2008-2004) – Outboard Engine
-   Nissan NSD 70A2 (70 HP) – Outboard Engine
-   Nissan NSD 50A (50 HP, 2008-2004) – Outboard Engine
-   Nissan NSD 40A (40 HP, 2008-2004) – Outboard Engine
-   Tohatsu MD90A (90 HP, 2008-2004) – Outboard Engine
-   Tohatsu MD90A2 (90 HP, 2008-2004) – Outboard Engine
-   Tohatsu MD70A2 (70 HP, 2008-2004) – Outboard Engine
-   Tohatsu MD50A (50 HP, 2008-2004) – Outboard Engine
-   Tohatsu MD40A (40 HP, 2008-2004) – Outboard Engine
-   Acura CL (2003-2001) – 4-10 per engine
-   Acura EL (2005-2001) – 4-10 per engine
-   Acura TL (2003-2002) – 4-10 per engine
-   Bmw 550i (2010-2006) – 4-10 per engine
-   Bmw 650i (2010-2006) – 4-10 per engine
-   Bmw 750i (2008-2006) – 4-10 per engine
-   Bmw 750Li (2008-2006) – 4-10 per engine
-   Bmw X5 (2010-2004) – 4-10 per engine
-   Chevrolet Aveo (2011-2009) – 4-10 per engine
-   Chevrolet Aveo5 (2011-2009) – 4-10 per engine
-   Chrysler Aspen (2007) – 4-10 per engine
-   Dodge B1500 (1998-1997) – 4-10 per engine
-   Dodge B2500 (1998-1997) – 4-10 per engine
-   Dodge B3500 (1998-1997) – 4-10 per engine

That is the 25 most common of 51 applications NGK's charts list for this plug – ask us to check yours.

## 🔄 Supersession & Cross Reference

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

-   Bosch: 9603, 9604, 9664, FR7KII33X, FR7LII33X, FR8KII332X
-   DENSO: 4701, 5357, 5358, IK16L, IK16TT, IK20L
-   Champion: 9803, 9803S
-   Autolite: XP5224

## 📦 Condition

-   Brand new genuine product
-   Supplied in original packaging

## Details

- **Price:** 42.0 AUD
- **Vendor:** NGK
- **Type:** Ignition & Controls

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 42.00 AUD | In stock |

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/zfr6fix-11-ngk-iridium-spark-plug-genuine-ngk-spark-plug)
> Updated: 2026-09-03