{"product_id":"quicksilver-extended-life-marine-coolant-50-50-pre-diluted-1-gallon-mercruiser-closed-cooling-ethylene-glycol","title":"Quicksilver Extended Life Marine Coolant 50\/50 Pre-Diluted 1 Gallon — MerCruiser Closed Cooling, Ethylene Glycol","description":"\u003cp\u003e\u003cstrong\u003eQuicksilver 877770Q1 Extended Life Coolant\/Antifreeze is a factory-formulated, pre-diluted 50\/50 coolant designed specifically for MerCruiser closed cooling stern drive and inboard gasoline engines.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis one-gallon, pre-mixed formula arrives ready to pour and is engineered to protect marine gasoline engines in closed cooling systems. Quicksilver has produced marine-grade lubricants and fluids for decades, and this coolant is formulated to deliver extended corrosion protection while meeting common ASTM specifications for ethylene glycol-based antifreezes. It’s silicate- and phosphate-free, compatible with conventional antifreeze, and rated to provide extended life performance without gelling.\u003c\/p\u003e\n\n\u003ch3\u003eWhat engines and cooling systems is this coolant made for?\u003c\/h3\u003e\n\u003cp\u003eThis product is tailored for MerCruiser closed cooling systems used in stern drive and inboard gasoline engines. Always consult your boat or engine owner’s manual for compatibility and maintenance intervals before use. It’s formulated to perform within the parameters set by Mercury Marine equipment requirements.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eIntended for MerCruiser closed cooling stern drive and inboard gasoline engines\u003c\/li\u003e\n  \u003cli\u003ePre-diluted 50\/50 for immediate use—no mixing required\u003c\/li\u003e\n  \u003cli\u003eCompatible with many conventional ethylene-glycol antifreezes\u003c\/li\u003e\n  \u003cli\u003eCheck vehicle manual or service guide for model-specific guidance\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow long does the protection last and what standards does it meet?\u003c\/h3\u003e\n\u003cp\u003eThe formula is engineered to deliver extended life protection for up to five years or 1,000 operating hours under recommended conditions. It meets key industry standards to ensure predictable freeze and boil protection while offering corrosion control for closed-loop marine cooling systems.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eProvides up to 5 years or 1,000 operating hours of protection\u003c\/li\u003e\n  \u003cli\u003eMeets ASTM D-3306 and ASTM D-4340 specifications\u003c\/li\u003e\n  \u003cli\u003eDesigned for closed cooling systems where extended service intervals are desired\u003c\/li\u003e\n  \u003cli\u003eSilicate- and phosphate-free to reduce deposit formation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat are the mixture, composition, and handling points I should know?\u003c\/h3\u003e\n\u003cp\u003eThe product is ethylene glycol-based and comes pre-mixed with de-ionized water at a 50\/50 ratio, so it’s ready to use straight from the bottle. Because it’s pre-diluted, you avoid measurement errors and can top off or replace coolant without further mixing. Follow standard safety and disposal practices for coolant fluids.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eEthylene glycol base, pre-diluted to a 50\/50 mix with de-ionized water\u003c\/li\u003e\n  \u003cli\u003eWill not cause gelling when used as directed\u003c\/li\u003e\n  \u003cli\u003eCompatible with many conventional antifreeze products for service flexibility\u003c\/li\u003e\n  \u003cli\u003eObserve local regulations for disposal and avoid ingestion or contact with pets\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does this coolant help with maintenance and engine longevity?\u003c\/h3\u003e\n\u003cp\u003eUsing a manufacturer-formulated coolant helps maintain corrosion control and thermal stability in closed-loop systems, which supports reliable engine operation over time. Regularly scheduled coolant changes and monitoring reduce the risk of localized corrosion, scale, and heat-transfer loss that can shorten component life.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eHelps protect internal passages and heat exchangers from corrosion\u003c\/li\u003e\n  \u003cli\u003eMaintains freeze and boil-over protection when kept at recommended levels\u003c\/li\u003e\n  \u003cli\u003eReduces risk of deposits by being silicate- and phosphate-free\u003c\/li\u003e\n  \u003cli\u003ePre-diluted convenience cuts service time and mixing errors\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: Boaters, mechanics, and service shops that operate MerCruiser stern drive or inboard gasoline engines and prefer a ready-to-use, manufacturer-compatible coolant. It’s a practical choice for anyone looking to follow factory maintenance guidance, extend service intervals, and simplify coolant replacement with a trusted Quicksilver product.\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 this coolant ready to use or do I need to mix it?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: It is pre-diluted 50\/50 with de-ionized water and ready to pour—no mixing required.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I use this with other conventional antifreezes?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes, it’s compatible with conventional ethylene-glycol antifreezes, but follow your engine manual.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Quicksilver","offers":[{"title":"Default Title","offer_id":48086033399966,"sku":"B00BO88OY6","price":47.16,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/quicksilver-front-label-1-gallon.jpg?v=1785882399","url":"https:\/\/northtrailauto.ca\/products\/quicksilver-extended-life-marine-coolant-50-50-pre-diluted-1-gallon-mercruiser-closed-cooling-ethylene-glycol","provider":"North Trail Auto","version":"1.0","type":"link"}