{"product_id":"bosch-9603-oe-double-iridium-spark-plugs-pack-of-4-fine-wire-oe-fit-4-long-life","title":"Bosch 9603 OE Double Iridium Spark Plugs Pack of 4 — Fine-Wire, OE Fit \u0026 4× Long Life","description":"\u003cstrong\u003eBosch 9603 OE Fine Wire Double Iridium spark plugs are OE-grade replacement plugs with ultra-fine iridium electrodes designed for improved ignitability and up to four times the life of standard copper plugs.\u003c\/strong\u003e\n\nBosch engineered these double-iridium spark plugs to match original equipment specifications while extending service intervals. Built with a 360-degree laser-welded ultra-fine iridium firing pin and an iridium ground inlay, the 9603 model reduces voltage needs and resists wear, making it suitable for modern gasoline and Gasoline Direct Injection (GDI) engines. Each plug arrives factory pre-gapped and fitted with nickel-plated rolled threads to resist corrosion and simplify installation without anti-seize.\n\n\u003ch3\u003eHow do these plugs improve ignition performance?\u003c\/h3\u003e\n\u003cp\u003eThe fine-wire iridium center electrode and iridium ground inlay provide a smaller, more focused spark that ignites air-fuel mixtures more efficiently. Lower voltage requirements mean fewer misfires under demanding conditions and steadier engine starts.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e360° laser-welded ultra-fine iridium firing pin improves ignitability\u003c\/li\u003e\n  \u003cli\u003eReduces voltage requirements up to about 24% versus conventional plugs\u003c\/li\u003e\n  \u003cli\u003eSharper spark geometry for consistent combustion across cylinders\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eAre these spark plugs durable and easy to maintain?\u003c\/h3\u003e\n\u003cp\u003eYes — the double iridium construction extends service life and helps maintain gap geometry longer than copper plugs. Nickel-plated rolled threads resist galling and corrosion, simplifying removal and eliminating the need for anti-seize compounds during installation.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eIridium center and ground electrodes for long wear life (up to 4× longer)\u003c\/li\u003e\n  \u003cli\u003eNickel-plated rolled threads prevent corrosion and ease removal\u003c\/li\u003e\n  \u003cli\u003eFactory pre-gapped so plugs are ready to install out of the box\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill these plugs fit my vehicle and modern engine types?\u003c\/h3\u003e\n\u003cp\u003eBosch designs the 9603 to meet or exceed manufacturer requirements for fit, form, and function across many gasoline engines, including GDI systems. Always confirm compatibility with your vehicle’s engine code or the fitment checker, since engine variations affect correct plug selection.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eOE-matched spark position for compatibility with GDI engines\u003c\/li\u003e\n  \u003cli\u003eListed fitments include models from Acura, Honda, Lexus, Toyota, Nissan, Mercedes-Benz, and more\u003c\/li\u003e\n  \u003cli\u003eVerify exact engine\/application before purchase to ensure correct fit\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow simple is installation and what should I expect?\u003c\/h3\u003e\n\u003cp\u003eInstallation is straightforward: plugs come pre-gapped and ready to install, so no gap adjustment is typically required. The corrosion-resistant threads reduce the risk of galling and make future removal easier, saving time during routine maintenance.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePre-gapped at factory — install right out of the box\u003c\/li\u003e\n  \u003cli\u003eNo anti-seize required thanks to nickel-plated rolled threads\u003c\/li\u003e\n  \u003cli\u003ePack of four covers most four-cylinder plug replacements in one purchase\u003c\/li\u003e\n\u003c\/ul\u003e\n\nWho is this for: Drivers and technicians who want a direct OE-replacement spark plug that balances long life and consistent performance. The Bosch 9603 suits owners of modern gasoline and GDI-equipped vehicles who prefer factory-matched specifications, longer service intervals, and hassle-free installation without extra anti-seize treatment. Ideal for routine tune-ups, performance-conscious maintenance, and fleets seeking dependable, easily serviceable ignition components.\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Do Bosch 9603 plugs require gap adjustment?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No, they are factory pre-gapped and generally ready to install without adjustment.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can these plugs be used in GDI engines?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes, the OE-matched spark position makes them compatible with many Gasoline Direct Injection engines.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Bosch","offers":[{"title":"Default Title","offer_id":48086008758430,"sku":"B0792LVCZW","price":49.98,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/bosch-9603-front-packaging.jpg?v=1785881974","url":"https:\/\/northtrailauto.ca\/products\/bosch-9603-oe-double-iridium-spark-plugs-pack-of-4-fine-wire-oe-fit-4-long-life","provider":"North Trail Auto","version":"1.0","type":"link"}