{"product_id":"lucas-oil-25w-40-marine-engine-oil-fc-w-5-qt-stern-drive-inboard-synthetic-enriched-protection","title":"Lucas Oil 25W-40 Marine Engine Oil FC-W – 5 qt Stern Drive\/Inboard, Synthetic-Enriched Protection","description":"\u003cp\u003e\u003cstrong\u003eLucas Oil SAE 25W-40 Stern Drive Inboard Marine Oil FC-W is a heavy-duty 4-stroke marine engine oil formulated to protect inboard and stern drive engines, support catalytic-system longevity, and resist rust during storage.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eBuilt for stern drives, inboards and compatible 4-stroke outboards, this Lucas Oil marine formulation meets or exceeds NMMA FC-W performance and aligns with MERCRUISER® sterndrive requirements. It combines a robust viscosity profile with synthetic-enriched additives to protect moving parts from wear, inhibit corrosion and help preserve catalyst performance in newer engines equipped with emission control systems.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this oil protect engines during heavy use?\u003c\/h3\u003e\n\u003cp\u003eThe 25W-40 viscosity provides a stable lubricating film at operating temperatures, reducing metal-to-metal contact under load. Additives in the formula condition component surfaces, lowering wear rates and extending component life in demanding marine environments.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eThicker high-temperature film for load-bearing protection\u003c\/li\u003e\n  \u003cli\u003eWear-inhibiting additives that reduce friction on bearings and gears\u003c\/li\u003e\n  \u003cli\u003eFormulated to meet MERCRUISER® stern drive specifications\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill this oil help engines with catalytic converters?\u003c\/h3\u003e\n\u003cp\u003eThis product is engineered to increase catalyst life in newer inboards that use catalytic converters by meeting NMMA FC-W standards designed for emission-sensitive engines. It balances detergency and additive chemistry to minimize catalyst-fouling deposits while maintaining engine cleanliness.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eMeets or exceeds NMMA® FC-W (CAT) performance\u003c\/li\u003e\n  \u003cli\u003eLower propensity for ash and deposit formation that can harm catalysts\u003c\/li\u003e\n  \u003cli\u003eSuitable for emission-controlled marine engines when FC-W is specified\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCan I use Lucas 25W-40 marine oil for storage or seasonal layup?\u003c\/h3\u003e\n\u003cp\u003eThe formula includes synthetic-enriched corrosion inhibitors that cling to metal surfaces and help guard against rust and moisture during idle periods or long storage. Proper lubrication and corrosion protection make it a good choice if your boat spends months unused between seasons.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSynthetic additives form a protective coating on internal parts\u003c\/li\u003e\n  \u003cli\u003eInhibits rust and corrosion during long storage intervals\u003c\/li\u003e\n  \u003cli\u003eRecommended when winterizing or storing vessels for extended periods\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIs this oil compatible with other marine and automotive engines?\u003c\/h3\u003e\n\u003cp\u003eLucas 25W-40 FC-W is primarily formulated for marine stern drives and inboards, but it also meets API SM performance levels, meaning it can be used in certain automotive applications where API SM oils are called for. Always consult your engine or vehicle manufacturer’s recommendations before switching oil types.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eMeets API SM thresholds for cross-compatibility in some autos\u003c\/li\u003e\n  \u003cli\u003eSuitable for select 4-stroke outboards and personal watercraft where specified\u003c\/li\u003e\n  \u003cli\u003eFollow manufacturer guidance for viscosity and spec requirements\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: Boaters, marinas and marine technicians who maintain stern drive and inboard engines—especially vessels with catalytic converters—will benefit from this Lucas Oil 25W-40 formulation. It’s a practical pick for owners seeking strong wear protection, storage corrosion resistance and compatibility with FC-W required systems. If your engine manual specifies NMMA FC-W or a 25W-40 marine oil, this product provides a concentrated, quart-sized option from a recognized marine lubricant brand.\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 Lucas 25W-40 FC-W safe for catalytic converter-equipped inboards?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. It meets NMMA FC-W standards designed to protect catalysts and reduce deposit formation in compatible inboard engines.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can this oil be used for winter storage?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The synthetic additives help coat parts to resist rust and moisture during long storage periods.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Lucas Oil","offers":[{"title":"Default Title","offer_id":48084086325406,"sku":"B01D3BO238","price":69.62,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/lucas-oil-25w40-front-label.jpg?v=1785845992","url":"https:\/\/northtrailauto.ca\/products\/lucas-oil-25w-40-marine-engine-oil-fc-w-5-qt-stern-drive-inboard-synthetic-enriched-protection","provider":"North Trail Auto","version":"1.0","type":"link"}