{"product_id":"sierra-9420cat3-4-stroke-mineral-marine-outboard-engine-oil-10w-30-1-gallon","title":"Sierra 9420CAT3 4-Stroke Mineral Marine Outboard Engine Oil, 10W-30, 1 Gallon","description":"\u003ch2\u003eSierra 9420CAT3 4-Stroke Mineral Marine Engine Oil, 10W-30 – 1 Gallon\u003c\/h2\u003e\u003cp\u003eA premium mineral-base 10W-30 engine oil formulated specifically for marine 4-stroke outboard engines. Sierra 9420CAT3 meets or exceeds the lubrication requirements of Mercury, Yamaha, Johnson-Evinrude, Suzuki, and Honda outboards — delivering reliable protection across a wide range of engine brands and operating conditions.\u003c\/p\u003e\u003cp\u003eThe 1-gallon jug is the practical middle ground: enough for multiple oil changes on smaller engines, or a full service plus top-up reserve on larger outboards, without the commitment of drum-quantity purchasing.\u003c\/p\u003e\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMarine-specific formulation\u003c\/strong\u003e — engineered for the demands of 4-stroke outboard engines, not repurposed automotive oil\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAnti-wear additives\u003c\/strong\u003e — reduce friction and protect engine internals under sustained load\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum corrosion protection\u003c\/strong\u003e — guards against moisture and salt exposure in the marine environment\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSludge control\u003c\/strong\u003e — keeps engine internals cleaner for better long-term efficiency\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow-temperature viscosity\u003c\/strong\u003e — supports reliable cold-weather and cold-start performance\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBroad OEM compatibility\u003c\/strong\u003e — meets API SJ, CF-2, and CH-4 service classifications\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eViscosity: SAE 10W-30\u003c\/li\u003e\n\u003cli\u003eBase stock: Mineral\u003c\/li\u003e\n\u003cli\u003eAPI service: SJ, CF-2, CH-4\u003c\/li\u003e\n\u003cli\u003eVolume: 1 US gallon (3.78 L)\u003c\/li\u003e\n\u003cli\u003ePart number: 9420CAT3 | SKU: 47-9420CAT3\u003c\/li\u003e\n\u003cli\u003eCompatible engines: Mercury, Yamaha, Johnson-Evinrude, Suzuki, Honda 4-stroke outboards\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eBest Use Case\u003c\/h3\u003e\u003cp\u003eThe 1-gallon format is the right choice for \u003cstrong\u003erecreational boaters and small marina shops\u003c\/strong\u003e who service one or two 4-stroke outboards regularly and want a cost-effective, reliable mineral oil without the volume commitment of a drum. It’s particularly well-suited for mid-size outboards (50–150 HP) where a gallon covers a full drain-and-fill with oil to spare.\u003c\/p\u003e\u003cp\u003eAlso available in a \u003ca href=\"\/products\/sierra-9420cat2-4-stroke-mineral-forumulation-marine-outboard-engine-oil-10w-30-qt\"\u003e1-Quart size (9420CAT2)\u003c\/a\u003e for smaller engines or top-ups, and in a \u003ca href=\"\/products\/sierra-9420cat7-4-stroke-mineral-marine-outboard-engine-oil-10w-30-55-gal-drum\"\u003e55-Gallon Drum (9420CAT7)\u003c\/a\u003e for high-volume shop use. For a synthetic blend upgrade with FC-W certification and extended drain interval performance, see the \u003ca href=\"\/products\/sierra-synthetic-blend-10w30-fc-w-4-stroke-outboard-engine-oil-1-qt-9421cat2\"\u003eSierra 9421CAT2 Synthetic Blend 10W-30\u003c\/a\u003e.\u003c\/p\u003e\u003ch3\u003eParts Desk Insights\u003c\/h3\u003e\u003cp\u003eBest use case is the recreational single-engine boater or small shop doing seasonal oil changes on 4-stroke outboards. The gallon is the most popular format for DIY customers — it’s the right size for one full service on most mid-size outboards with a small reserve. Upsell path: customers doing multiple engines or buying frequently should be directed to the 55-gallon drum (9420CAT7) for better cost-per-litre value. Always flag the FC-W certification question for Yamaha and Mercury customers — if they’re warranty-conscious, redirect to the \u003ca href=\"\/products\/sierra-synthetic-blend-10w30-fc-w-4-stroke-outboard-engine-oil-1-qt-9421cat2\"\u003eSierra 9421CAT2 Synthetic Blend (FC-W)\u003c\/a\u003e. Confirm OEM oil spec in the owner’s manual before recommending.\u003c\/p\u003e","brand":"LNS","offers":[{"title":"Default Title","offer_id":51199660163108,"sku":"47-9420CAT3","price":67.79,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/47-9420CAT3.jpg?v=1785611253","url":"https:\/\/marisolmarine.com\/products\/sierra-9420cat3-4-stroke-mineral-marine-outboard-engine-oil-10w-30-1-gallon","provider":"Marisol Marine Company","version":"1.0","type":"link"}