{"product_id":"sierra-sae-30-full-synthetic-marine-engine-oil-available-in-quart-and-5-quart-sizes","title":"Sierra Full Synthetic SAE 30 Engine Oil - Available in Quart and 5 Quart","description":"\u003cp\u003eSierra Full Synthetic SAE 30 Engine Oil is a full synthetic lubricant recommended for gasoline and diesel inboard and sterndrive engines. Its full synthetic base provides longer lubrication effectiveness than conventional mineral-based oils, helping protect critical engine components during startup, normal operation, and storage. The formulation is API CF\/SL rated, meeting service requirements for both diesel (CF) and gasoline (SL) applications commonly found in marine inboard and sterndrive powerplants.\u003c\/p\u003e\u003cp\u003eRegular use of a full synthetic oil helps reduce oil consumption and can improve fuel economy compared to conventional oils, while its stable synthetic molecular structure resists breakdown under the heat cycling and extended idle periods typical of marine engines. This makes it a suitable choice for engines that see seasonal storage as well as regular operation.\u003c\/p\u003e\u003cp\u003eThis oil is sold as a single product line offered in two bottle sizes to match different oil change needs: a Quart bottle for topping off or smaller-capacity engines, and a 5 Quart bottle for a full oil change on larger-capacity inboard or sterndrive engines. Always confirm your engine's oil capacity and manufacturer-recommended change interval before purchasing.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-9410\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOil Type:\u003c\/strong\u003e Full Synthetic\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSAE Viscosity Grade:\u003c\/strong\u003e SAE 30\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAPI Service Rating:\u003c\/strong\u003e API CF\/SL\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRecommended Use:\u003c\/strong\u003e Gasoline and diesel inboard and sterndrive engines\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eContainer Type:\u003c\/strong\u003e Bottle\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAvailable Sizes:\u003c\/strong\u003e Quart (32 Fluid Ounces), 5 Quart (160 Fluid Ounces)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Warranty:\u003c\/strong\u003e 90 days\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSizes \u0026amp; Options\u003c\/h3\u003e\u003cp\u003eChoose the Quart size for topping off oil between changes or for smaller-capacity engines, and choose the 5 Quart size when performing a complete oil change on larger inboard or sterndrive engines. Check your engine's total oil capacity to determine how many bottles you need.\u003c\/p\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat SAE viscosity grade is this oil?\u003c\/strong\u003e Sierra Full Synthetic Engine Oil (part number 18-9410) is an SAE 30 single-grade oil.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this oil full synthetic or conventional?\u003c\/strong\u003e It is a full synthetic formulation, which provides longer lubrication effectiveness than conventional mineral-based oils.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat API service rating does this oil meet?\u003c\/strong\u003e The 18-9410 oil is rated API CF\/SL, covering both diesel (CF) and gasoline (SL) service requirements.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat engines is this oil recommended for?\u003c\/strong\u003e Sierra recommends this SAE 30 full synthetic oil for gasoline and diesel inboard and sterndrive engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat sizes are available for this oil?\u003c\/strong\u003e This oil line is available in a Quart bottle and a 5 Quart bottle, sold as part numbers 18-9410-2 and 18-9410-4 respectively.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I choose between the Quart and 5 Quart bottle?\u003c\/strong\u003e Pick the size based on your engine's total oil capacity: use the Quart bottle for topping off or smaller engines, and the 5 Quart bottle for a complete oil change on larger inboard or sterndrive engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this oil help with fuel economy or oil consumption?\u003c\/strong\u003e Yes, the full synthetic formulation of the 18-9410 oil is designed to reduce oil consumption and can improve fuel economy compared to conventional oils.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this oil suitable for engine storage periods?\u003c\/strong\u003e The 18-9410 full synthetic SAE 30 oil is formulated to provide superior engine protection during startups, operation, and storage.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat comes in the package?\u003c\/strong\u003e Each purchase includes a single bottle of Sierra Full Synthetic SAE 30 Engine Oil in the size selected, either Quart or 5 Quart.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a genuine Sierra product?\u003c\/strong\u003e Yes, this is a genuine Sierra-branded full synthetic SAE 30 engine oil, part number 18-9410.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Quart","offer_id":48988058091739,"sku":"SIE-18-9410-2","price":13.44,"currency_code":"USD","in_stock":true},{"title":"5 Quart","offer_id":48988058124507,"sku":"SIE-18-9410-4","price":56.92,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-9410-2_NEW__11726.1763741575.500.750.jpg?v=1785188771","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-sae-30-full-synthetic-marine-engine-oil-available-in-quart-and-5-quart-sizes","provider":"Good Vibes Marina","version":"1.0","type":"link"}