{"product_id":"ngk-iridium-spark-plugs-ltr5ix-11-6-pack-direct-fit-6-cylinder-fine-wire-iridium","title":"NGK Iridium Spark Plugs LTR5IX-11 6-Pack — Direct-Fit 6-Cylinder, Fine-Wire Iridium","description":"\u003cp\u003e\u003cstrong\u003eNGK LTR5IX-11 (Stock #4344) iridium spark plugs—six high-performance plugs engineered to restore reliable ignition and consistent combustion in compatible 6-cylinder engines.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThese NGK LTR5IX-11 iridium spark plugs are a direct-fit replacement for a wide range of domestic and import 6-cylinder vehicles, offering a durable iridium center electrode, integrated resistor, and factory-specified reach and hex size. Each plug in this 6-pack features a fine-wire iridium core with a tapered seat, mid-projection insulator tip, and a pre-set gap matched to popular engine applications. The result is improved ignition consistency, reduced misfires, and a stable spark gap over service life when installed to the manufacturer’s specifications.\u003c\/p\u003e\n\n\u003ch3\u003eWhich vehicles and engine sizes are these NGK 4344 plugs compatible with?\u003c\/h3\u003e\n\u003cp\u003eThis set fits numerous GM, Ford, Mazda, Lincoln, Isuzu and related platforms that use NGK LTR5IX-11. Compatibility covers various model years and 3.5L–4.3L 6-cylinder engines; gap and pre-gap values depend on the specific vehicle.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eGM family: Buick Rainier, Chevrolet Express\/Silverado\/Trailblazer, GMC Envoy\/Sierra\/Savana (2002–2024 ranges listed)\u003c\/li\u003e\n  \u003cli\u003eFord \u0026amp; Lincoln: Edge, Flex, Fusion, Taurus, MKX\/MKZ\/MKS\/MKT (2007–2012 ranges)\u003c\/li\u003e\n  \u003cli\u003eMazda \u0026amp; others: Mazda 6, CX-9, Mercury Sable, Oldsmobile Bravada, Isuzu Ascender (2002–2015 ranges)\u003c\/li\u003e\n  \u003cli\u003eVerify exact year\/engine combo and recommended gap: examples range from 0.040\" to 0.052\" factory gaps\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat are the key technical specs and why do they matter?\u003c\/h3\u003e\n\u003cp\u003eThese plugs use a fine iridium center electrode with a nickel ground electrode in a J-gap layout, plus a 5000-ohm resistor. Their materials and geometry are chosen to keep ignition sharp, limit gap growth, and reduce electrical noise.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eMaterial grade: Iridium center; copper core for thermal stability\u003c\/li\u003e\n  \u003cli\u003eThread: 14.0 mm diameter with 25.0 mm reach and tapered seat\u003c\/li\u003e\n  \u003cli\u003eHex\/insulator: 5\/8\" (16 mm) hex; 2.07\" (52.5 mm) insulator height\u003c\/li\u003e\n  \u003cli\u003eElectrical: 5000-ohm resistor; non-removable terminal\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do these NGK iridium plugs impact performance and maintenance?\u003c\/h3\u003e\n\u003cp\u003eIridium’s high melting point and fine-wire design produce a focused, consistent spark that helps combustion stability and fewer misfires across service intervals. Their construction also resists corrosion and limits electrode wear, which maintains ignitability longer than standard plugs.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSharper spark focus for improved combustion initiation\u003c\/li\u003e\n  \u003cli\u003eReduced gap erosion and longer service life compared with conventional plugs\u003c\/li\u003e\n  \u003cli\u003eDiminished radio-frequency interference due to built-in resistor\u003c\/li\u003e\n  \u003cli\u003eCorrosion-resistant shell for durable thread engagement and removal\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat installation details should I check before fitting these plugs?\u003c\/h3\u003e\n\u003cp\u003eConfirm thread pitch, reach, and seat type match your engine to avoid damage. Use the vehicle manufacturer’s torque and gap specifications; do not re-gap beyond recommended tolerances for iridium plugs.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePre-gap shown: typically 0.044\" (1.1 mm) or vehicle-specific values (0.040\"–0.052\")\u003c\/li\u003e\n  \u003cli\u003eReach: 25.0 mm (0.984\") — verify this suits your cylinder head\u003c\/li\u003e\n  \u003cli\u003eTorque to OEM spec and use anti-seize only if manufacturer allows\u003c\/li\u003e\n  \u003cli\u003eReplace ignition coil boots or wires if worn when servicing plugs\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: automotive DIYers, independent repair shops, and fleet managers looking for a direct-fit, factory-grade iridium spark plug solution for 6-cylinder GM, Ford, Mazda, Lincoln and related vehicles. Choose this 6-pack NGK LTR5IX-11 set when you need long-lasting ignitability, reduced misfires, and an OEM-compatible replacement meeting original heat range and reach specifications.\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 LTR5IX-11 plugs a direct replacement for my vehicle?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: They fit many 3.5L–4.3L 6-cylinder engines listed; always verify year, engine size, thread reach, and gap against your vehicle’s specs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I re-gap these iridium spark plugs?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Iridium plugs are pre-gapped for service; minor gap adjustments are possible but avoid excessive re-gapping to prevent electrode damage.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"NGK","offers":[{"title":"Default Title","offer_id":48084120535198,"sku":"B0042UDVBO","price":73.98,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/ngk-ltr5ix-11-front-box-shot.jpg?v=1785846814","url":"https:\/\/northtrailauto.ca\/products\/ngk-iridium-spark-plugs-ltr5ix-11-6-pack-direct-fit-6-cylinder-fine-wire-iridium","provider":"North Trail Auto","version":"1.0","type":"link"}