{"product_id":"sierra-premium-blend-heavy-duty-marine-engine-oil-15w40-5qt","title":"Sierra Premium Blend Heavy Duty Marine Engine Oil 15W-40 – 5 Qt","description":"\u003ch2\u003eSierra Premium Blend Heavy Duty Marine Engine Oil 15W-40 – 5 Qt\u003c\/h2\u003e\n\u003cp\u003eEngineered specifically for heavy-duty inboard marine engines, this 15W-40 premium blend oil is the right choice for cruisers, towboats, and high-hour diesel or gasoline inboard applications that demand more than a standard marine oil can deliver. Built on premium base stocks with an advanced additive package, it meets API CK-4 (diesel) and API SM (gasoline) service classifications — placing it at the top tier of marine lubrication performance.\u003c\/p\u003e\n\u003cp\u003eThe 5-quart jug provides enough volume for a complete oil change on most single inboard engines, with the convenience of a single container.\u003c\/p\u003e\n\n\u003ch3\u003eKey Benefits\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMeets API CK-4 diesel and API SM gasoline service classifications\u003c\/li\u003e\n\u003cli\u003eSuitable for all fuel sulfur levels — including high-sulfur diesel\u003c\/li\u003e\n\u003cli\u003ePremium blend formula delivers heavy-duty protection for high-load inboard applications\u003c\/li\u003e\n\u003cli\u003eCompatible with MerCruiser, Indmar, Pleasurecraft, Crusader, Volvo Penta, and Mastercraft engine specifications\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot for use in gasoline engines equipped with catalytic converters\u003c\/strong\u003e — see FC-W Catalyst Compatible oils for those applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eViscosity:\u003c\/strong\u003e 15W-40\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Premium Blend\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVolume:\u003c\/strong\u003e 5 Quarts\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAPI Rating:\u003c\/strong\u003e CK-4 (diesel) \/ SM (gasoline)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Heavy-duty gasoline and diesel inboard marine engines\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCatalyst Compatible:\u003c\/strong\u003e No — not for use with catalytic converter-equipped engines\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated Products\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/sierra-95542-premium-blend-heavy-duty-engine-oil-15w-40-qt-12-case\"\u003eSierra Heavy Duty 15W-40 Marine Engine Oil – 1 Qt\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/sierra-25w40-fcw-catalyst-compatible-4-stroke-marine-engine-oil-5-qt\"\u003eSierra 25W-40 FC-W Catalyst Compatible Marine Engine Oil – 5 Qt\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/sierra-25w40-fcw-catalyst-compatible-4-stroke-marine-engine-oil-qt\"\u003eSierra 25W-40 FC-W Catalyst Compatible Marine Engine Oil – 1 Qt\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\u003ch3\u003eParts Desk Insights\u003c\/h3\u003e\n\u003cp\u003eThe 15W-40 heavy duty spec is the correct oil for older and high-displacement inboard diesel and gasoline engines — particularly trawlers, cruisers, and towboats running Indmar, Crusader, Pleasurecraft, or older MerCruiser and Volvo Penta inboard engines that call for a 15W-40. It is \u003cstrong\u003enot\u003c\/strong\u003e suitable for engines with catalytic converters; if your engine has a catalyst system, use the \u003ca href=\"\/products\/sierra-25w40-fcw-catalyst-compatible-4-stroke-marine-engine-oil-5-qt\"\u003eSierra 25W-40 FC-W Catalyst Compatible oil\u003c\/a\u003e instead. The 5 Qt jug covers most single-engine inboard oil changes — check your engine manual for exact capacity. If you prefer to buy by the quart, the \u003ca href=\"\/products\/sierra-95542-premium-blend-heavy-duty-engine-oil-15w-40-qt-12-case\"\u003e1 Qt size\u003c\/a\u003e is also available. Always confirm your engine’s oil specification before purchasing.\u003c\/p\u003e","brand":"LNS","offers":[{"title":"Default Title","offer_id":51199659409444,"sku":"47-95544","price":66.99,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/47-95542_571b2a99-8156-4ecd-a518-e02b45992aa3.jpg?v=1785611237","url":"https:\/\/marisolmarine.com\/products\/sierra-premium-blend-heavy-duty-marine-engine-oil-15w40-5qt","provider":"Marisol Marine Company","version":"1.0","type":"link"}