{"product_id":"quicksilver-extended-life-coolant-antifreeze-50-50-1-gallon","title":"Quicksilver Extended Life Coolant\/Antifreeze – Pre-Diluted 50\/50, 1 Gallon","description":"\u003ch2\u003eQuicksilver Extended Life Coolant\/Antifreeze – Pre-Diluted 50\/50, 1 Gallon\u003c\/h2\u003e\u003cp\u003eKeep your MerCruiser closed cooling system protected year-round with Quicksilver Extended Life Coolant\/Antifreeze. Formulated specifically for MerCruiser sterndrive and inboard gasoline engines with closed cooling systems, this coolant delivers \u003cstrong\u003e5-year or 1,000 operating hour\u003c\/strong\u003e extended life protection — far beyond what conventional antifreeze provides.\u003c\/p\u003e\u003cp\u003ePre-diluted to a ready-to-use \u003cstrong\u003e50\/50 mix with de-ionized water\u003c\/strong\u003e, so there’s no measuring or mixing required. The ethylene glycol base provides freeze and boil-over protection, while the silicate- and phosphate-free formula protects aluminum and other metals in the cooling system without causing gelling or compatibility issues with conventional antifreeze.\u003c\/p\u003e\u003cp\u003eMeets ASTM D-3306 and ASTM D-4340 requirements. Contains a 10 ppm bittering agent. See your engine’s owner’s manual or service manual for specific application instructions and capacity.\u003c\/p\u003e\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e5-year \/ 1,000 operating hour extended life protection\u003c\/li\u003e\n\u003cli\u003ePre-diluted 50\/50 with de-ionized water — ready to use\u003c\/li\u003e\n\u003cli\u003eEthylene glycol base for freeze and boil-over protection\u003c\/li\u003e\n\u003cli\u003eSilicate and phosphate free — safe for aluminum cooling system components\u003c\/li\u003e\n\u003cli\u003eWill not cause gelling\u003c\/li\u003e\n\u003cli\u003eCompatible with conventional antifreeze\u003c\/li\u003e\n\u003cli\u003eMeets ASTM D-3306 and ASTM D-4340 requirements\u003c\/li\u003e\n\u003cli\u003eContains 10 ppm bittering agent\u003c\/li\u003e\n\u003cli\u003e1 gallon\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eCompatible Applications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMerCruiser closed cooling systems\u003c\/li\u003e\n\u003cli\u003eMerCruiser sterndrive gasoline engine applications\u003c\/li\u003e\n\u003cli\u003eMerCruiser inboard gasoline engine applications\u003c\/li\u003e\n\u003cli\u003eCooling system flush and refill service\u003c\/li\u003e\n\u003cli\u003eWinterization of closed cooling systems\u003c\/li\u003e\n\u003c\/ul\u003e\u003chr\u003e\u003ch3\u003eParts Desk Insights\u003c\/h3\u003e\u003cp\u003eThis is the correct coolant for MerCruiser engines equipped with a closed (freshwater) cooling system — not raw water cooled engines, which don’t use antifreeze in the same way. The 5-year \/ 1,000-hour service interval is a genuine advantage over conventional antifreeze, which typically requires annual replacement. The pre-diluted 50\/50 formula is the right concentration for most climates; if you’re in an extreme cold-weather environment, check your owner’s manual for guidance on whether a higher concentration is needed. The silicate-free formula is important for aluminum-heavy cooling systems — silicate-based coolants can cause deposits and corrosion in these engines over time. Always flush the old coolant completely before refilling, and confirm the total system capacity from your service manual so you order enough to do the job properly.\u003c\/p\u003e","brand":"LNS","offers":[{"title":"Default Title","offer_id":51274730602532,"sku":"710-92-877770Q1","price":37.93,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/images_bc6ba70b-7932-4081-a6f0-dc863fdb788b.jpg?v=1786993817","url":"https:\/\/marisolmarine.com\/products\/quicksilver-extended-life-coolant-antifreeze-50-50-1-gallon","provider":"Marisol Marine Company","version":"1.0","type":"link"}