{"product_id":"denso-3421-iridium-spark-plugs-set-of-8-long-life-1-1mm-gap","title":"Denso 3421 Iridium Spark Plugs Set of 8 – Long Life, 1.1mm Gap","description":"\u003ch2\u003eGenuine DENSO 3421 Spark Plugs — 8‑Pack for Easy Replacement\u003c\/h2\u003e\n\u003cp\u003eThis set delivers eight DENSO 3421 iridium long life spark plugs designed for durable performance across a wide range of engines. Each plug features a precise .043 inch (1.1 mm) gap to support consistent spark delivery and efficient combustion. This is a genuine DENSO part, packaged to match original specifications, and it includes the necessary hardware for a straightforward installation. The kit is labeled for Amazon Confirmed Fit, helping you verify compatibility with your vehicle before you buy.\u003c\/p\u003e\n\n\u003ch3\u003eWhy choose DENSO 3421 iridium plugs?\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e8 pack of genuine DENSO 3421 spark plugs for convenient maintenance intervals\u003c\/li\u003e\n  \u003cli\u003eIridium long life design for durable performance and reduced maintenance frequency\u003c\/li\u003e\n  \u003cli\u003e1.1 mm gap size supports efficient ignition and steady combustion\u003c\/li\u003e\n  \u003cli\u003eIncludes original packaging and hardware for authentic replacement parts\u003c\/li\u003e\n  \u003cli\u003eDirect replacement auto parts that align with factory specifications\u003c\/li\u003e\n  \u003cli\u003eAmazon Confirmed Fit to help confirm vehicle compatibility\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eIn daily use, iridium plugs like the 3421 are built to resist wear under higher temperatures and extended engine operation. The hard, high-heat iridium alloy helps maintain a consistent spark over many miles, which can contribute to smooth starts and steady idle in a variety of driving scenarios. While individual results vary by vehicle and driving style, the long-life design is associated with dependable performance over time.\u003c\/p\u003e\n\n\u003ch3\u003eReal‑world use and installation tips\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eIdeal for routine replacements during scheduled maintenance or as part of a performance upgrade.\u003c\/li\u003e\n  \u003cli\u003eCompatible with direct replacement installation, reducing guesswork when selecting parts.\u003c\/li\u003e\n  \u003cli\u003eExpect reliable ignition under daily commutes, highway cruising, and varying weather conditions.\u003c\/li\u003e\n  \u003cli\u003eKeep a spare set on hand for quick swaps to minimize downtime and maintain engine efficiency.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWhether you’re refreshing an aging ignition system or stocking up for a proactive tune‑up, this 8-pack from DENSO offers a practical balance of reliability and value. As a genuine DENSO part with verified fit options, it’s designed to support steady engine performance across typical driving needs without overpromising results.\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 included in the Set (8pcs) Denso Iridium Long Life Spark Plugs package?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: A genuine 8-pack of DENSO 3421 iridium spark plugs with original packaging and hardware.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I use these spark plugs as a direct replacement for my vehicle?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes, they are designed for direct replacement and are validated for fitment with Amazon Confirmed Fit.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Denso","offers":[{"title":"Default Title","offer_id":42464409026645,"sku":"B0721V9JYZ","price":95.03,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0632\/3270\/4597\/files\/denso-3421-iridium-spark-plug-8-pack.jpg?v=1777979483","url":"https:\/\/plentytorque.co.uk\/products\/denso-3421-iridium-spark-plugs-set-of-8-long-life-1-1mm-gap","provider":"PlentyTorque","version":"1.0","type":"link"}