{"product_id":"denso-sc16hr11-iridium-long-life-spark-plugs-3499-4-pk-oem-grade-performance","title":"Denso SC16HR11 Iridium Long-Life Spark Plugs 3499-4 PK | OEM-Grade Performance","description":"\u003ch2\u003eOverview\u003c\/h2\u003e\u003cp\u003eDenso SC16HR11 Iridium Long-Life Spark Plugs in the 3499-4 pack are built for reliability in both luxury and everyday engines. Featuring the patented Iridium alloy and a compact 0.7 mm center electrode, they’re designed to deliver crisp ignition, steady performance, and impressive longevity. These plugs are known for OEM-grade quality and are factory-installed on luxury models from automakers such as GM, Toyota, Honda, and Mitsubishi.\u003c\/p\u003e\u003ch3\u003eWhy choose the SC16HR11 design\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e100 percent pre-fired to ensure reliable operation\u003c\/li\u003e\n\u003cli\u003eCopper core center electrode for superior thermal conductivity\u003c\/li\u003e\n\u003cli\u003eFive rib insulator reduces flashover and decreases voltage loss\u003c\/li\u003e\n\u003cli\u003eDual copper and glass seal bonds the center electrode and insulator for a gas-tight seal\u003c\/li\u003e\n\u003cli\u003eLasts up to three times longer than conventional plugs\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eDesigned for premium OEM installations and aftermarket replacements, the SC16HR11 is a product of careful engineering that automakers trust. The plug’s reduced center electrode diameter enhances ignitability while maintaining durability across a wide range of engines and operating conditions.\u003c\/p\u003e\u003ch3\u003eReal life scenarios\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eIn luxury vehicles, these plugs support smooth starts and reliable ignition during cold starts and varying driving conditions.\u003c\/li\u003e\n\u003cli\u003eIn high mileage or performance-oriented applications, a longer service life can reduce maintenance frequency and downtime, allowing more time on the road.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eQuality and reliability matter. While experiences vary with engine design and maintenance, the SC16HR11 is positioned as a dependable upgrade that prioritizes longevity without compromising on efficiency or compatibility.\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: What is the Denso SC16HR11 3499-4 PK?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Denso SC16HR11 3499-4 PK is a premium iridium long-life spark plug designed for OEM fitment.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What are the key benefits of this spark plug?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Longer life, improved ignitability, and reliable operation thanks to copper core, five-rib insulator, and a gas-tight seal.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Denso","offers":[{"title":"Default Title","offer_id":42471067091029,"sku":"B083NJKY3Z","price":69.83,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0632\/3270\/4597\/files\/denso-sc16hr11-iridium-long-life-spark-plug-closeup.jpg?v=1778163840","url":"https:\/\/plentytorque.co.uk\/products\/denso-sc16hr11-iridium-long-life-spark-plugs-3499-4-pk-oem-grade-performance","provider":"PlentyTorque","version":"1.0","type":"link"}