{"product_id":"ngk-iridium-ix-spark-plug-6509-ltr6ix-11-4-pack-fine-iridium-tip-oem-fit-durability","title":"NGK Iridium IX spark plug 6509 LTR6IX-11 4-pack — fine iridium tip, OEM-fit durability","description":"\u003cstrong\u003eNGK 6509 Iridium IX LTR6IX-11 spark plugs are high-grade OEM-style ignition parts sold as a 4-pack for improved spark consistency and long service life.\u003c\/strong\u003e\n\n\u003cp\u003eThese NGK Iridium IX plugs combine a fine iridium center electrode with engineered construction to deliver steady ignition under normal driving conditions. Sold in a set of four, they match many original equipment specifications and are built for stable starting, consistent throttle response, and extended replacement intervals compared with standard copper plugs.\u003c\/p\u003e\n\n\u003ch3\u003eHow do these NGK Iridium IX plugs differ from standard spark plugs?\u003c\/h3\u003e\n\u003cp\u003eIridium plugs use a very hard, high-melting-point metal at the center electrode, which allows for a much finer tip and a more focused spark. That design reduces voltage requirement and helps maintain ignition performance as the plug wears.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eFine iridium center electrode for a concentrated spark\u003c\/li\u003e\n  \u003cli\u003eLonger electrode life versus copper or nickel plugs\u003c\/li\u003e\n  \u003cli\u003eLower voltage demand helps with consistent starts\u003c\/li\u003e\n  \u003cli\u003eManufactured to OEM-quality tolerances\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill the LTR6IX-11 fit my vehicle and what should I check before ordering?\u003c\/h3\u003e\n\u003cp\u003eThis part is listed as an OEM-style replacement for specific applications; verify fitment by matching plug number, thread size, reach, and heat range to your vehicle’s service manual. Always confirm engine, drivetrain, and plug quantity before purchase to ensure compatibility.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCompare part number 6509 \/ LTR6IX-11 with your service spec\u003c\/li\u003e\n  \u003cli\u003eCheck thread diameter and seat type for proper fit\u003c\/li\u003e\n  \u003cli\u003eConfirm reach (thread length) to prevent engine damage\u003c\/li\u003e\n  \u003cli\u003eOrder plugs in the quantity your engine requires (this listing is for 4)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat performance or maintenance benefits can I expect?\u003c\/h3\u003e\n\u003cp\u003eThese Iridium IX plugs are engineered to offer stable combustion and extended service intervals, which can lead to fewer replacements over time. Improved electrode durability helps maintain ignition quality between scheduled maintenance events.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eConsistent spark delivery for reliable starts and idle\u003c\/li\u003e\n  \u003cli\u003eDurable electrode reduces changeout frequency\u003c\/li\u003e\n  \u003cli\u003eOEM-level manufacturing for dependable fit and function\u003c\/li\u003e\n  \u003cli\u003eSold as a convenient 4-pack for multi-cylinder engines\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eWho is this for?\u003c\/strong\u003e Drivers, mechanics, and DIY enthusiasts seeking OEM-quality replacement plugs that balance durability with dependable ignition performance. Choose these NGK Iridium IX 6509 plugs when you want a long-lasting, manufacturer-grade part for compatible engines and the assurance of purchasing genuine NGK components.\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: Is this NGK 6509 sold as a complete set or individual plugs?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: This listing is for a pack of four NGK Iridium IX 6509 (LTR6IX-11) spark plugs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: How often should I replace these Iridium IX spark plugs?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Replace intervals vary by vehicle and driving conditions; check your owner's manual, but iridium plugs typically last longer than standard types.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"NGK","offers":[{"title":"Default Title","offer_id":48086791028894,"sku":"B004359CD4","price":54.61,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/ngk-iridium-ix-front-packaging_5447099b-ceaf-46de-ae7e-19fabf7f2e44.jpg?v=1785905307","url":"https:\/\/northtrailauto.ca\/products\/ngk-iridium-ix-spark-plug-6509-ltr6ix-11-4-pack-fine-iridium-tip-oem-fit-durability","provider":"North Trail Auto","version":"1.0","type":"link"}