NGK 4589 Laser Iridium Spark Plugs IFR6T11 4 Pack – Compatible with Toyota, Lexus, Lotus, Mazda, Pontiac, Scion & Daewoo (1990–2012)

Overview

Meet the NGK 4589 Laser Iridium spark plugs, a four‑pack designed to support OE‑level ignition for a broad mix of engines from the 1990s to early 2010s. Built by NGK, a renowned OEM spark plug maker, these plugs pair a resilient iridium tip with a copper core and robust ceramic insulation to support reliable starts and steady performance across many vehicle families. While individual results vary with condition and maintenance, this 4‑pack offers a practical, shop‑tested option for routine service or preventive replacement.

Wide compatibility for many models

The IFR6T11 plugs are suitable for a wide array of vehicles, spanning Daewoo, Lexus, Lotus, Mazda, Pontiac, Scion, and Toyota applications. Notable fitment spans Daewoo Lanos 1.6L (1999–2002), Lexus HS250h 2.4L (2010–2012), Lotus Elan 1.6L (1991), Mazda Miata 1.6L (1990–1993), Pontiac Vibe 1.8L (2003–2006) and 2.4L (2009–2010), Scion tC 2.4L (2005–2010) and xB 2.4L (2008–2012), plus a broad set of Toyota engines including Camry, Corolla, RAV4, Solara, Matrix, MR2, and Previa. Always verify the exact part number against your vehicle’s manual or NGK guidance before purchasing.

Core benefits and what makes them stand out

These are Laser Iridium plugs, designed for durability and consistent performance in OE‑like conditions. The iridium tipped center electrode and fine‑wire design offer longevity, while the durable ceramic insulator helps manage heat and maintain stable operation. A platinum pad on the ground electrode supports even wear in distributorless ignition systems, contributing to balanced combustion across a wide range of engines.

• Iridium tipped center electrode with copper core for durability and efficient sparks
• High‑quality ceramic insulator with strong heat resistance
• Platinum pad on the ground electrode fosters even wear
• Resistor type included to reduce electrical noise

Key specs at a glance

• Thread diameter: 14.0 mm (0.551 in)
• Reach: 19.0 mm (0.750 in)
• Pre‑gap: 1.1 mm (0.044 in)
• Hex size: 16 mm (5/8 in)
• Insulator height: 50.5 mm (1.99 in)
• Heat range: 6
• Resistor: Yes
• Stock number: 4589; Part number: IFR6T11

What you get

• Four NGK IFR6T11 Laser Iridium spark plugs (part 4589)
• Crush washers included for secure sealing
• OE‑style ground configuration and robust copper/iridium construction