{"product_id":"sierra-synthetic-blend-4-stroke-marine-engine-oil-25w40-fcw-1-qt-9440cat2","title":"Sierra Synthetic Blend 4-Stroke Marine Engine Oil, 25W40 FC-W, 1 Qt. – 9440CAT2","description":"\u003ch2\u003eSierra Synthetic Blend 4-Stroke Marine Engine Oil – 25W40 FC-W | 1 Qt. | Part #9440CAT2\u003c\/h2\u003e\u003cp\u003eThe same NMMA FC-W certified synthetic-blend 25W40 formulation as the larger jug and drum sizes, in a single-quart bottle. Designed specifically for 4-stroke inboard and sterndrive engines — including those with emission catalyst systems — this oil meets requirements that standard automotive engine oils cannot satisfy. Sold in case packs only.\u003c\/p\u003e\u003ch3\u003eWhy FC-W Certification Matters\u003c\/h3\u003e\u003cp\u003eMarine 4-stroke engines run at sustained high RPM, face constant moisture exposure, and often sit idle for extended periods between uses. The NMMA FC-W standard is specifically designed for these conditions. Using an automotive oil in a marine engine can void the manufacturer’s warranty and accelerate internal corrosion and wear — FC-W certified oil is the correct choice for any 4-stroke inboard or sterndrive application.\u003c\/p\u003e\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNMMA FC-W® Certified \/ API-SL\u003c\/strong\u003e — meets the marine industry standard for 4-stroke water-cooled engines, with and without emission catalyst systems\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCatalyst-safe ZDDP technology\u003c\/strong\u003e — anti-wear additive package prevents phosphorus depletion and extends emission catalyst life\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSynthetic blend base\u003c\/strong\u003e — better thermal stability and oxidation resistance than conventional mineral oil\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSAE 25W40 viscosity\u003c\/strong\u003e — the correct grade for most 4-stroke inboard and sterndrive marine engines\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnhanced detergents and dispersants\u003c\/strong\u003e — prevents sludge formation and keeps engine internals clean\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCorrosion inhibitors\u003c\/strong\u003e — protects internal components against moisture-related corrosion during operation and storage\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWear protection and deposit control\u003c\/strong\u003e — maintains engine performance across the full service interval\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrevents viscosity thinning\u003c\/strong\u003e — maintains oil film strength under high-performance conditions\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eViscosity: SAE 25W40\u003c\/li\u003e\n\u003cli\u003eCertification: NMMA FC-W®\u003c\/li\u003e\n\u003cli\u003eAPI service: SL\u003c\/li\u003e\n\u003cli\u003eApplication: 4-stroke inboard and sterndrive marine engines, with or without emission catalyst systems\u003c\/li\u003e\n\u003cli\u003eSize: 1 US quart (946 mL)\u003c\/li\u003e\n\u003cli\u003ePart number: 9440CAT2\u003c\/li\u003e\n\u003cli\u003eSold as: Case packs only\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eParts Desk Insights\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eBest use case:\u003c\/strong\u003e The single-quart bottle is the right format for top-ups between oil changes, topping off after a filter change, or keeping a spare quart aboard for longer passages. It’s also useful for engines with smaller oil capacities where a full 5-quart jug would leave significant leftover product. For a complete single-engine oil change, the \u003ca href=\"\/products\/11120080125988\"\u003eSierra Synthetic Blend 25W40 FC-W 4-Stroke Marine Engine Oil, 5 Qt. – 9440CAT4\u003c\/a\u003e is the more economical choice per litre. For high-volume shop use, the \u003ca href=\"\/products\/11120080158756\"\u003eSierra Synthetic Blend 25W40 FC-W 4-Stroke Marine Engine Oil, 55-Gallon Drum – 9440CAT7\u003c\/a\u003e delivers the same formulation at bulk pricing. To complete the service, pair with a compatible \u003ca href=\"\/products\/11120074588196\"\u003eSierra 4-Cycle Outboard Oil Filter\u003c\/a\u003e.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCompatibility note:\u003c\/strong\u003e Always verify your engine manufacturer’s oil specification before use — viscosity grade, FC-W certification requirement, and API service category. Not all 4-stroke marine engines specify 25W40; confirm your engine’s requirement in the service manual. Sold in case packs — confirm case quantity at time of order.\u003c\/p\u003e","brand":"LNS","offers":[{"title":"Default Title","offer_id":51199660294180,"sku":"47-9440CAT2","price":23.29,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/47-9440CAT2.jpg?v=1785611256","url":"https:\/\/marisolmarine.com\/products\/sierra-synthetic-blend-4-stroke-marine-engine-oil-25w40-fcw-1-qt-9440cat2","provider":"Marisol Marine Company","version":"1.0","type":"link"}