# IFR6T11 NGK Iridium Spark Plug | Genuine NGK Spark Plug

## 🔧 Product Description

**NGK Iridium Spark Plug – Part Number: IFR6T11**

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: 4589
-   Thread: 14 mm
-   Reach: 19 mm (3/4 in)
-   Hex: 16 mm (5/8 in)
-   Seat: Gasket
-   Terminal: Solid
-   Type: ISO Projected FR-Series 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.

-   Toyota EPIC 21 - 4.0L (300 HP) – Inboard Engine
-   Toyota EPIC 22 - 4.0L (300 HP) – Inboard Engine
-   Toyota S22 - 4.0L (300 HP) – Inboard Engine
-   Toyota X22 - 4.0L (300 HP) – Inboard Engine
-   Daewoo Lanos (2002-1999) – 4-8 per engine
-   Lexus ES300 (1995-1994) – 4-8 per engine
-   Lexus ES300 (2003-1999) – 4-8 per engine
-   Lexus ES330 (2006-2004) – 4-8 per engine
-   Lexus GS300 (1993) – 4-8 per engine
-   Lexus GS300 (2005-2001) – 4-8 per engine
-   Lexus GS400 (2000-1998) – 4-8 per engine
-   Lexus GS430 (2007-2001) – 4-8 per engine
-   Lexus GX470 (2009-2003) – 4-8 per engine
-   Lexus HS250h (2012-2010) – 4-8 per engine
-   Lexus IS300 (2005-2001) – 4-8 per engine
-   Lexus LS400 (2000-1990) – 4-8 per engine
-   Lexus LS430 (2006-2001) – 4-8 per engine
-   Lexus LX470 (2007-1998) – 4-8 per engine
-   Lexus RX300 (2003-1999) – 4-8 per engine
-   Lexus RX330 (2006-2004) – 4-8 per engine
-   Lexus RX400h (2008-2006) – 4-8 per engine
-   Lexus SC300 (1994-1993) – 4-8 per engine
-   Lexus SC400 (2000-1992) – 4-8 per engine
-   Lexus SC430 (2010-2002) – 4-8 per engine
-   Lotus Elan (1991) – 4-8 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.

-   DENSO: 3297, 3335, 4504, 4702, IK20TT, PK20TT, SK20R-P11, SK20R11
-   Champion: 9806, 9806-2
-   ACDelco: 41-111
-   Autolite: XP3923
-   Beck Arnley: 1765299
-   Bosch: 8100
-   Torch: K6RTIP

## 📦 Condition

-   Brand new genuine product
-   Supplied in original packaging

## Details

- **Price:** 21.0 AUD
- **Vendor:** NGK
- **Type:** Ignition & Controls

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 21.00 AUD | In stock |

## Images

- IFR6T11 NGK iridium spark plug
- IFR6T11 NGK iridium spark plug firing end

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/ifr6t11-ngk-iridium-spark-plug-genuine-ngk-spark-plug)
> Updated: 2026-09-03