{"product_id":"ngk-iridium-spark-plugs-ifr6t11-4589-4-pack-fine-wire-iridium-oem-fit-for-toyota-lexus","title":"NGK Iridium Spark Plugs IFR6T11 (4589) 4-Pack — Fine‑Wire Iridium, OEM Fit for Toyota \u0026 Lexus","description":"\u003cp\u003e\u003cstrong\u003eNGK 4589 (IFR6T11) Laser Iridium spark plugs are high‑performance, OE‑grade iridium plugs sold in a 4-pack and engineered to deliver consistent ignition and long service life for specified Toyota, Lexus, Mazda, Pontiac, Scion, Lotus and Daewoo engines.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThese IFR6T11 spark plugs combine a fine‑wire iridium center electrode with a platinum ground pad and a copper core to balance ignition reliability, heat control and wear resistance. Manufactured to OEM tolerances and supplied by NGK — a leading original equipment spark plug maker — they are intended for engines listed in the compatibility section and match OE reach, thread and heat range specifications for those applications.\u003c\/p\u003e\n\n\u003ch3\u003eWhich vehicles and engines will accept the NGK 4589 IFR6T11 plugs?\u003c\/h3\u003e\n\u003cp\u003eThe IFR6T11 (stock number 4589) fits a variety of late‑20th and early‑21st century models across several brands. Always cross‑check the part number with your vehicle’s manual or NGK to confirm fitment before purchase.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eToyota: Camry, Celica, Corolla, Highlander, Matrix, MR2, Previa, RAV4, Solara (various 1.8L–2.4L years listed).\u003c\/li\u003e\n  \u003cli\u003eLexus: HS250h 2.4L (2010–2012); Mazda: Miata 1.6L (1990–1993).\u003c\/li\u003e\n  \u003cli\u003eScion and Pontiac: tC, xB, Vibe 1.8L\/2.4L model years noted; plus Lotus Elan and Daewoo Lanos specific years.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do these iridium plugs improve ignition and longevity?\u003c\/h3\u003e\n\u003cp\u003eIridium on the center electrode provides a very hard, wear‑resistant tip that supports a stable spark over many more miles than standard electrodes. The copper core and high‑grade ceramic insulator help dissipate heat and minimize misfires under normal operating conditions.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eFine‑wire iridium center electrode for precise spark and extended life.\u003c\/li\u003e\n  \u003cli\u003ePlatinum pad on the ground electrode to ensure even wear.\u003c\/li\u003e\n  \u003cli\u003e98% pure copper core and alumina ceramic insulator for heat control and reliable starts.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat are the key technical specs and installation points to know?\u003c\/h3\u003e\n\u003cp\u003eThese plugs are manufactured with a 0.750 in reach, a 14.0 mm thread diameter, a 5\/8\" (16 mm) hex and a pre‑gap of 0.044 in (1.1 mm). They include a crush washer and a non‑removable nut terminal; the resistor value is specified for OEM‑style ignition systems.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eReach: 0.750 in (19.0 mm); thread diameter: 14.0 mm; hex size: 5\/8\" (16 mm).\u003c\/li\u003e\n  \u003cli\u003ePre‑gap: 0.044 in (1.1 mm); insulator height: 50.5 mm; seat type: flat.\u003c\/li\u003e\n  \u003cli\u003eCenter electrode tip: iridium with copper core; ground electrode tip: platinum; resistor included.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill these plugs require special tools or adjustments for installation?\u003c\/h3\u003e\n\u003cp\u003eInstallation follows typical spark plug replacement procedures for OEM‑style plugs and requires correct torque and gap verification. Use a torque wrench set to your vehicle manufacturer’s specification and recheck the gap if a plug is overtightened or if heavy deposits are present.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eNo special ignition tools required; use a 5\/8\" (16 mm) socket and appropriate torque wrench.\u003c\/li\u003e\n  \u003cli\u003eVerify the 0.044 in (1.1 mm) pre‑gap if you adjust for specific engine setups.\u003c\/li\u003e\n  \u003cli\u003eAlways consult the vehicle manual for torque and sequence to avoid thread damage.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? Drivers and mechanics seeking OEM‑quality replacement plugs for the listed Toyota, Lexus, Mazda, Pontiac, Scion, Lotus and Daewoo engines who want longer service life and a precise spark from a trusted manufacturer. Ideal for owners who prefer a direct OE‑spec iridium upgrade to maintain factory performance and reduce re‑service frequency.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003eNote:\u003c\/em\u003e This listing contains four IFR6T11 NGK Laser Iridium spark plugs (stock number 4589). Confirm part compatibility with your vehicle’s documentation or NGK before ordering.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Are NGK 4589 plugs pre‑gapped?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: They come with a 0.044 in (1.1 mm) pre‑gap but you should verify and adjust to your vehicle’s spec before installation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can these replace OEM iridium plugs?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes, the IFR6T11 is an OE‑grade iridium replacement for the compatible models listed; confirm part number and reach first.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"NGK","offers":[{"title":"Default Title","offer_id":48082988302494,"sku":"B00IYBU8VI","price":58.03,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/ngk-4589-front-package.jpg?v=1785821906","url":"https:\/\/northtrailauto.ca\/products\/ngk-iridium-spark-plugs-ifr6t11-4589-4-pack-fine-wire-iridium-oem-fit-for-toyota-lexus","provider":"North Trail Auto","version":"1.0","type":"link"}