{"product_id":"bosch-9621-oe-double-iridium-spark-plugs-pack-of-4-fine-wire-pre-gapped-for-gdi-engines","title":"Bosch 9621 OE Double Iridium Spark Plugs Pack of 4 — Fine-Wire, Pre-Gapped for GDI Engines","description":"\u003cp\u003e\u003cstrong\u003eBOSCH 9621 OE Fine Wire Double Iridium spark plugs are precision-engineered replacement plugs that combine ultra-fine iridium electrodes and OE-matched design to improve ignitability and extend service life.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThese Bosch OE-style double iridium plugs are built to the specifications of modern gasoline engines, including Gasoline Direct Injection (GDI) systems. Their ultra-fine center electrode, laser-welded tapered ground electrode, and durable iridium inlays are designed to reduce the voltage needed for ignition while resisting wear over time. Pre-gapped at the factory and fitted with nickel-plated rolled threads, they arrive ready to install and resist corrosion and galling for easier removal during service.\u003c\/p\u003e\n\n\u003ch3\u003eHow do these spark plugs improve engine ignitability?\u003c\/h3\u003e\n\u003cp\u003eThe ultra-fine iridium center electrode and the laser-welded tapered ground electrode concentrate the spark energy for more efficient combustion. Reduced voltage requirements help the ignition system work less hard, which can improve start-up consistency and throttle response.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e360-degree laser welding for consistent spark location\u003c\/li\u003e\n  \u003cli\u003eFine-wire iridium center electrode reduces required firing voltage\u003c\/li\u003e\n  \u003cli\u003eTapered ground electrode narrows the spark gap area for reliable ignition\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill these plugs fit modern GDI and OE-spec engines?\u003c\/h3\u003e\n\u003cp\u003eYes — Bosch engineers the 9621 to match original equipment specifications for fit, position, and function in many contemporary gasoline engines, including those with Gasoline Direct Injection. OE-matched spark position helps maintain the combustion characteristics intended by the vehicle maker.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDesigned to meet or exceed manufacturer fit and form requirements\u003c\/li\u003e\n  \u003cli\u003eSpark position optimized for GDI applications\u003c\/li\u003e\n  \u003cli\u003eFactory pre-gapped for correct installation out of the box\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow durable and service-friendly are these spark plugs?\u003c\/h3\u003e\n\u003cp\u003eBosch uses iridium for both the center electrode and the ground electrode inlay, improving wear resistance and extending expected service intervals. Nickel-plated rolled threads provide corrosion resistance and reduce the risk of galling, so plugs remove cleanly and typically don’t need anti-seize.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDouble iridium construction for extended electrode life\u003c\/li\u003e\n  \u003cli\u003eNickel-plated rolled threads resist corrosion and ease removal\u003c\/li\u003e\n  \u003cli\u003eNo anti-seize required — saves installation time and ensures correct torque readings\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat installation and maintenance considerations should I know?\u003c\/h3\u003e\n\u003cp\u003eThese spark plugs come factory pre-gapped and are ready for immediate installation, reducing prep time and the chance of incorrect gap settings. Always follow your vehicle manufacturer’s torque and replacement interval recommendations for best results.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePre-gapped at the factory — no gap adjustment necessary before install\u003c\/li\u003e\n  \u003cli\u003eInstall to manufacturer-recommended torque values\u003c\/li\u003e\n  \u003cli\u003eReplace at OEM-specified intervals or when performance degrades\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: Drivers and technicians who want an OE-equivalent spark plug with long service life and consistent ignition performance will benefit from the BOSCH 9621 double iridium plugs. They suit owners of modern gasoline and GDI vehicles seeking a long-lasting, service-friendly replacement that preserves factory engine characteristics while reducing ignition voltage demands.\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 plugs pre-gapped?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. Bosch 9621 plugs are factory pre-gapped and ready to install without gap adjustment.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Do I need anti-seize on the threads?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No. The nickel-plated rolled threads resist corrosion and usually do not require anti-seize.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Bosch","offers":[{"title":"Default Title","offer_id":48086275326110,"sku":"B0762GB2TM","price":48.2,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/bosch-9621-front-packaging.jpg?v=1785893174","url":"https:\/\/northtrailauto.ca\/products\/bosch-9621-oe-double-iridium-spark-plugs-pack-of-4-fine-wire-pre-gapped-for-gdi-engines","provider":"North Trail Auto","version":"1.0","type":"link"}