{"product_id":"ngk-laser-iridium-spark-plugs-silzkgr8b8s-94201-4-pack-iridium-tip-long-life","title":"NGK Laser Iridium Spark Plugs SILZKGR8B8S (94201) 4-Pack — Iridium Tip, Long Life","description":"\u003cp\u003e\u003cstrong\u003eNGK SILZKGR8B8S Laser Iridium Spark Plug (94201) is a four-pack of precision-engineered iridium spark plugs designed to deliver reliable ignition, improved throttle response, and long life for compatible engines.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThese NGK Laser Iridium plugs use a fine iridium center electrode and a robust ground electrode to promote consistent sparks under a wide range of operating conditions. Built to NGK's OEM-level tolerances, the SILZKGR8B8S (94201) suits vehicles that require a long-lasting, high-energy spark element while maintaining factory-specified gap and thread dimensions. This product listing covers a pack of four plugs, making it convenient for routine maintenance or partial engine servicing.\u003c\/p\u003e\n\n\u003ch3\u003eHow does the laser iridium center electrode improve ignition?\u003c\/h3\u003e\n\n\u003cp\u003eThe ultra-thin iridium tip concentrates the spark into a smaller surface area, which enables more reliable combustion initiation across cycles. That focused spark can help the engine fire more consistently, especially during cold starts or lean mixtures.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003e0.4–0.6 mm fine iridium center for a concentrated spark\u003c\/li\u003e\n  \u003cli\u003eStable firing characteristics over long mileage\u003c\/li\u003e\n  \u003cli\u003eResists electrode erosion better than standard nickel plugs\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat fitment and specifications should I check before buying?\u003c\/h3\u003e\n\n\u003cp\u003eConfirm your vehicle’s required thread size, reach, and heat range match the SILZKGR8B8S specifications to ensure proper seating and thermal control. Check your owner’s manual or NGK cross-reference to verify compatibility with the 94201 designation.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eNGK part number: SILZKGR8B8S, also referenced as 94201\u003c\/li\u003e\n  \u003cli\u003eVerify thread diameter, reach length, and hex size against OEM specs\u003c\/li\u003e\n  \u003cli\u003eConfirm recommended gap or re-gap tolerance if needed\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow long can I expect these spark plugs to last in normal use?\u003c\/h3\u003e\n\n\u003cp\u003eIridium plugs like the SILZKGR8B8S are engineered for extended service intervals compared to conventional plugs, resisting wear and maintaining gap stability. Real-world life depends on driving conditions, engine tune, and maintenance, but iridium designs typically offer several times the longevity of standard nickel plugs.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eDurable iridium tip for reduced electrode wear\u003c\/li\u003e\n  \u003cli\u003eMaintains gap stability over extended mileage\u003c\/li\u003e\n  \u003cli\u003eService interval influenced by engine and usage patterns\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCan I install these myself, and are there installation tips?\u003c\/h3\u003e\n\n\u003cp\u003eMany owners can replace spark plugs at home with basic tools if they follow torque specs and safety precautions. Use a torque wrench, anti-seize only if specified by NGK, and check gap where required to avoid misfires or thread damage.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eHand-start threads to avoid cross-threading\u003c\/li\u003e\n  \u003cli\u003eUse a torque wrench to NGK\/OEM torque recommendations\u003c\/li\u003e\n  \u003cli\u003eInspect boot seals and ignition coils while replacing plugs\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The NGK SILZKGR8B8S (94201) 4-pack is suited for vehicle owners and mechanics seeking a direct-replacement high-performance spark plug with long service life. Choose this set if your application specifies the SILZKGR8B8S or 94201 part number, you want improved ignition consistency over standard plugs, and you prefer an OEM-quality component for routine maintenance or performance-minded tune-ups. If you’re unsure about fitment, consult your vehicle manual, NGK’s fitment guides, or a trusted mechanic to ensure the correct thread, reach, and heat range for your engine.\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 NGK SILZKGR8B8S the same as 94201?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. SILZKGR8B8S is NGK’s part designation often referenced as 94201; confirm fitment with your vehicle guide.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Do these plugs require special gapping before installation?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: They are typically pre-gapped, but always verify and adjust to your vehicle’s specified gap if necessary.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"NGK","offers":[{"title":"Default Title","offer_id":48080387080350,"sku":"B07FQLPFLG","price":117.48,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/ngk-silzkgr8b8s-front-packaging.jpg?v=1785780822","url":"https:\/\/northtrailauto.ca\/products\/ngk-laser-iridium-spark-plugs-silzkgr8b8s-94201-4-pack-iridium-tip-long-life","provider":"North Trail Auto","version":"1.0","type":"link"}