{"product_id":"merc-1320","title":"Mercury MerCruiser NGK Spark Plug ITR4A15 8M0204739 4-pack","description":"\u003cdiv class=\"flex max-w-full flex-col gap-4 grow\"\u003e\n\u003cdiv data-message-author-role=\"assistant\" data-message-id=\"da255e46-1145-47dc-817a-944290832e85\" dir=\"auto\" data-message-model-slug=\"gpt-5-3\" class=\"min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal [.text-message+\u0026amp;]:mt-1\"\u003e\n\u003cdiv class=\"flex w-full flex-col gap-1 empty:hidden\"\u003e\n\u003cdiv class=\"markdown prose dark:prose-invert w-full wrap-break-word dark markdown-new-styling\"\u003e\n\u003cp data-start=\"0\" data-end=\"75\"\u003e\u003cstrong data-start=\"0\" data-end=\"73\"\u003eMercury MerCruiser \/ Quicksilver NGK Spark Plug – ITR4A15 (8M0204739)\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"77\" data-end=\"446\"\u003eMaintain strong ignition performance with the \u003cstrong data-start=\"123\" data-end=\"210\"\u003egenuine Mercury Marine \/ Quicksilver 8M0204739 NGK ITR4A15 Laser Iridium Spark Plug\u003c\/strong\u003e. This OEM spark plug is designed for select \u003cstrong data-start=\"255\" data-end=\"287\"\u003eMerCruiser V6 and V8 engines\u003c\/strong\u003e, delivering reliable ignition, improved combustion efficiency, and long service life in demanding marine environments. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"448\" data-end=\"685\"\u003eThe \u003cstrong data-start=\"452\" data-end=\"486\"\u003eLaser Iridium center electrode\u003c\/strong\u003e provides precise spark and exceptional durability, while the copper core and ceramic insulator help dissipate heat and maintain consistent engine performance. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003chr data-start=\"687\" data-end=\"690\"\u003e\n\u003ch2 data-start=\"692\" data-end=\"707\"\u003eKey Features\u003c\/h2\u003e\n\u003cul data-start=\"708\" data-end=\"1086\"\u003e\n\u003cli data-start=\"708\" data-end=\"764\"\u003e\n\u003cp data-start=\"710\" data-end=\"764\"\u003eGenuine \u003cstrong data-start=\"718\" data-end=\"762\"\u003eMercury \/ Quicksilver OEM NGK spark plug\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"765\" data-end=\"839\"\u003e\n\u003cp data-start=\"767\" data-end=\"839\"\u003e\u003cstrong data-start=\"767\" data-end=\"794\"\u003eLaser Iridium electrode\u003c\/strong\u003e for long service life and consistent spark\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"840\" data-end=\"911\"\u003e\n\u003cp data-start=\"842\" data-end=\"911\"\u003e\u003cstrong data-start=\"842\" data-end=\"857\"\u003eCopper core\u003c\/strong\u003e improves heat dissipation and combustion efficiency\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"912\" data-end=\"976\"\u003e\n\u003cp data-start=\"914\" data-end=\"976\"\u003eCorrosion-resistant construction for \u003cstrong data-start=\"951\" data-end=\"974\"\u003emarine environments\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"977\" data-end=\"1086\"\u003e\n\u003cp data-start=\"979\" data-end=\"1086\"\u003e\u003cstrong data-start=\"979\" data-end=\"1024\"\u003ePre-gapped to manufacturer specifications\u003c\/strong\u003e for easy installation \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1088\" data-end=\"1091\"\u003e\n\u003ch2 data-start=\"1093\" data-end=\"1108\"\u003ePart Details\u003c\/h2\u003e\n\u003cul data-start=\"1109\" data-end=\"1359\"\u003e\n\u003cli data-start=\"1109\" data-end=\"1143\"\u003e\n\u003cp data-start=\"1111\" data-end=\"1143\"\u003e\u003cstrong data-start=\"1111\" data-end=\"1131\"\u003eOEM Part Number:\u003c\/strong\u003e 8M0204739\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1144\" data-end=\"1187\"\u003e\n\u003cp data-start=\"1146\" data-end=\"1187\"\u003e\u003cstrong data-start=\"1146\" data-end=\"1160\"\u003eNGK Model:\u003c\/strong\u003e ITR4A15 (Stock No. 5599)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1188\" data-end=\"1228\"\u003e\n\u003cp data-start=\"1190\" data-end=\"1228\"\u003e\u003cstrong data-start=\"1190\" data-end=\"1207\"\u003eProduct Type:\u003c\/strong\u003e Iridium spark plugSuperseded \/ Cross-Reference\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1188\" data-end=\"1228\" style=\"font-weight: bold;\"\u003e\u003cstrong\u003e4 pack\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1398\" data-end=\"1458\"\u003eThis plug replaces earlier Mercury part numbers including:\u003c\/p\u003e\n\u003cul data-start=\"1459\" data-end=\"1547\"\u003e\n\u003cli data-start=\"1459\" data-end=\"1473\"\u003e\n\u003cp data-start=\"1461\" data-end=\"1473\"\u003e\u003cstrong data-start=\"1461\" data-end=\"1471\"\u003e884019\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1474\" data-end=\"1491\"\u003e\n\u003cp data-start=\"1476\" data-end=\"1491\"\u003e\u003cstrong data-start=\"1476\" data-end=\"1489\"\u003e884019001\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1492\" data-end=\"1547\"\u003e\n\u003cp data-start=\"1494\" data-end=\"1547\"\u003e\u003cstrong data-start=\"1494\" data-end=\"1507\"\u003e8M2018369\u003c\/strong\u003e \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1549\" data-end=\"1552\"\u003e\n\u003ch2 data-start=\"1554\" data-end=\"1594\"\u003eCompatible Mercury MerCruiser Engines\u003c\/h2\u003e\n\u003cp data-start=\"1595\" data-end=\"1675\"\u003eCommonly used on \u003cstrong data-start=\"1612\" data-end=\"1661\"\u003eMerCruiser MPI sterndrive and inboard engines\u003c\/strong\u003e, including:\u003c\/p\u003e\n\u003cul data-start=\"1677\" data-end=\"1788\"\u003e\n\u003cli data-start=\"1677\" data-end=\"1704\"\u003e\n\u003cp data-start=\"1679\" data-end=\"1704\"\u003e\u003cstrong data-start=\"1679\" data-end=\"1702\"\u003e4.3L V6 MPI engines\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1705\" data-end=\"1732\"\u003e\n\u003cp data-start=\"1707\" data-end=\"1732\"\u003e\u003cstrong data-start=\"1707\" data-end=\"1730\"\u003e5.0L V8 MPI engines\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1733\" data-end=\"1760\"\u003e\n\u003cp data-start=\"1735\" data-end=\"1760\"\u003e\u003cstrong data-start=\"1735\" data-end=\"1758\"\u003e5.7L V8 MPI engines\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1761\" data-end=\"1788\"\u003e\n\u003cp data-start=\"1763\" data-end=\"1788\"\u003e\u003cstrong data-start=\"1763\" data-end=\"1786\"\u003e6.2L V8 MPI engines\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1790\" data-end=\"1928\"\u003eThese engines are typically equipped with \u003cstrong data-start=\"1832\" data-end=\"1860\"\u003eECM 555 ignition systems\u003c\/strong\u003e in many 2001+ applications. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003chr data-start=\"1930\" data-end=\"1933\"\u003e\n\u003ch2 data-start=\"1935\" data-end=\"1958\"\u003ePerformance Benefits\u003c\/h2\u003e\n\u003cp data-start=\"1959\" data-end=\"2183\"\u003eIridium spark plugs produce a \u003cstrong data-start=\"1989\" data-end=\"2023\"\u003estronger and more stable spark\u003c\/strong\u003e, which can improve engine starting, maintain smoother idle, and provide more efficient combustion across the RPM range. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003chr data-start=\"2185\" data-end=\"2188\"\u003e\n\u003ch2 data-start=\"2190\" data-end=\"2221\"\u003eImportant Compatibility Note\u003c\/h2\u003e\n\u003cp data-start=\"2222\" data-end=\"2432\" data-is-last-node=\"\" data-is-only-node=\"\"\u003eSpark plug type and heat range vary by \u003cstrong data-start=\"2261\" data-end=\"2319\"\u003eengine model, ignition system, and serial number range\u003c\/strong\u003e. Always verify compatibility using the \u003cstrong data-start=\"2359\" data-end=\"2415\"\u003eengine serial number or owner’s manual specification\u003c\/strong\u003e before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"z-0 flex min-h-[46px] justify-start\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003eShipping:\u003c\/strong\u003e Ships same or next day for fast Canada wide shipping.\u003c\/p\u003e","brand":"MERC","offers":[{"title":"Default Title","offer_id":43563924652068,"sku":"8M0204739","price":33.07,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/9c4a4bd8cac6468e95b4e59834258630217907b609a92d3ff1af8d0a00ae74fc.webp?v=1773190980","url":"https:\/\/marisolmarine.com\/products\/merc-1320","provider":"Marisol Marine Company","version":"1.0","type":"link"}