{"product_id":"ngk-iridium-ix-spark-plugs-ltr6ix-11-6509-pack-of-8-iridium-tip-long-life","title":"NGK Iridium IX Spark Plugs LTR6IX-11 (6509) Pack of 8 — Iridium Tip, Long Life","description":"\u003cp\u003e\u003cstrong\u003eNGK LTR6IX-11 (6509) Iridium IX spark plugs — a genuine 8-pack replacement designed to deliver durable ignition performance for compatible gasoline engines.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThese NGK Iridium IX LTR6IX-11 (part number 6509) spark plugs are supplied as an authentic eight-piece set in original packaging. They’re intended as direct-fit replacements for vehicles that specify the LTR6IX-11 electrode configuration and NGK 6509 reference. Iridium construction and NGK engineering focus on consistent spark delivery, long service life, and straightforward swap-in installation when the correct gap and torque are used.\u003c\/p\u003e\n\n\u003ch3\u003eWhich vehicles and engines are these NGK LTR6IX-11 plugs compatible with?\u003c\/h3\u003e\n\u003cp\u003eCompatibility depends on manufacturer specifications and the engine’s required plug type. Always verify fitment with your vehicle’s service manual or a fitment tool before purchase to ensure correct thread size, reach, and heat range.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCheck OEM part cross-reference charts for NGK 6509 \/ LTR6IX-11 matches.\u003c\/li\u003e\n  \u003cli\u003eConfirm thread diameter, reach (thread length), and hex size against original plugs.\u003c\/li\u003e\n  \u003cli\u003eUse Amazon or dealership fitment tools to validate vehicle model year and engine code compatibility.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does the iridium tip benefit ignition and longevity?\u003c\/h3\u003e\n\u003cp\u003eIridium-tipped center electrodes provide a finer, more durable firing point than standard nickel plugs. The harder iridium material resists erosion from high temperatures and electrical wear, supporting a stable spark and reducing the rate of electrode degradation over time.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSmaller-diameter center electrode promotes more concentrated spark energy.\u003c\/li\u003e\n  \u003cli\u003eIridium alloy resists melting and wear at high combustion temperatures.\u003c\/li\u003e\n  \u003cli\u003eExtended service intervals compared with conventional plugs when used under normal conditions.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat should I know about installation and maintenance?\u003c\/h3\u003e\n\u003cp\u003eInstalling NGK LTR6IX-11 spark plugs follows standard spark plug replacement procedures: inspect the new plug gap, apply correct torque, and use anti-seize or dielectric compounds only if recommended for your specific engine. Proper installation prevents thread damage and ensures reliable engine performance.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eVerify and adjust plug gap to manufacturer specification before fitting.\u003c\/li\u003e\n  \u003cli\u003eTighten to the torque specified by the vehicle maker to avoid over- or under-tightening.\u003c\/li\u003e\n  \u003cli\u003eReplace in sets when multiple cylinders show wear for consistent firing across the engine.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy choose an original NGK eight-pack rather than single plugs?\u003c\/h3\u003e\n\u003cp\u003eBuying a complete eight-pack ensures matched electrodes across all cylinders, simplifies maintenance for multi-cylinder engines, and often offers better value than individual plugs. Original NGK packaging and parts authenticity also reduce the risk of counterfeit or incorrect components.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eUniform performance across all cylinders with identical part numbers.\u003c\/li\u003e\n  \u003cli\u003eCost-effective for engines requiring multiple replacements at once.\u003c\/li\u003e\n  \u003cli\u003eIncludes original NGK packaging and any OEM hardware supplied with the set.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho this is for: automotive DIYers, mechanics, and vehicle owners who need a reliable batch of genuine NGK iridium spark plugs for engines that specify the LTR6IX-11 (6509) part. Ideal for those seeking long-lasting ignition components, accurate factory-compatible replacements, and simplified maintenance when servicing multiple cylinders at once. Always confirm fitment for your exact engine and model year before installing.\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 these NGK LTR6IX-11 plugs genuine NGK parts?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes — this listing is for genuine NGK Iridium IX LTR6IX-11 (6509) spark plugs sold as an original eight-pack.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Do I need to gap these plugs before installation?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Check your vehicle’s specification; some NGK Iridium IX plugs arrive preset but you should verify and adjust the gap if required.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"NGK","offers":[{"title":"Default Title","offer_id":67584889749689,"sku":"B07PJ52HYJ","price":170.24,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/3765\/3177\/files\/ngk-ltr6ix-11-pack-front-packaging.jpg?v=1790457805","url":"https:\/\/redleafauto.ca\/products\/ngk-iridium-ix-spark-plugs-ltr6ix-11-6509-pack-of-8-iridium-tip-long-life","provider":"Redleaf Auto","version":"1.0","type":"link"}