{"id":2225,"date":"2025-07-25T16:23:03","date_gmt":"2025-07-25T09:23:03","guid":{"rendered":"https:\/\/www.dextrous-lubricant.com\/?post_type=product&p=2225"},"modified":"2025-08-19T14:24:54","modified_gmt":"2025-08-19T07:24:54","slug":"10w-40-synthetic-formula-4-stroke-marine-oil","status":"publish","type":"product","link":"https:\/\/www.dextrous-lubricant.com\/en\/product\/10w-40-synthetic-formula-4-stroke-marine-oil\/","title":{"rendered":"10W-40 Synthetic Formula 4-Stroke Marine Oil"},"content":{"rendered":"

\"\"\u00a0 \u00a010W-40 Synthetic Formula 4-Stroke Marine Oil<\/span><\/a><\/p>\n

General Information<\/strong>
AMSOIL 10W-40 Synthetic 4-Stroke Marine Oil is specially formulated for marine engines, providing outstanding wear protection, excellent viscosity stability, low volatility, and superior rust prevention. It is certified by NMMA FC-W<\/strong> and Warranty Certified<\/strong> for use in 4-stroke outboard engines, inboard engines, and general marine engines.<\/p>\n

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Benefits<\/strong><\/h3>\n

NMMA Certification<\/strong>
AMSOIL 4-Stroke Synthetic Marine Oil is certified by the National Marine Manufacturers Association (NMMA) and meets the NMMA FC-W Catalyst Compatible<\/strong> specification. Its NMMA registration number is #FC-00833T 10W-40<\/strong>.<\/p>\n

Superior Wear Protection<\/strong>
Marine engines often operate under high loads and at high RPMs for long periods, causing conventional oils to break down and lose viscosity. AMSOIL 4-Stroke Synthetic Marine Oil is engineered to withstand high temperatures and maintain a durable protective film on engine components, reducing wear and extending engine life.<\/p>\n

Rust and Corrosion Protection<\/strong>
Marine engines are highly susceptible to rust, which can lead to severe damage. AMSOIL 4-Stroke Synthetic Marine Oil contains superior anti-rust additives and meets the rigorous testing requirements of NMMA and FC-W Catalyst Compatible standards.<\/p>\n

\"Screenshot-2024-04-02-155802.png\"<\/a><\/p>\n

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Applications<\/strong><\/span><\/h3>\n

AMSOIL 4-Stroke Synthetic Marine Oil is ideal for:<\/span><\/p>\n

    \n
  • \n

    4-stroke outboard engines<\/span><\/p>\n<\/li>\n

  • \n

    Inboard engines<\/span><\/p>\n<\/li>\n

  • \n

    Inboard\/Outboard (I\/O) engines<\/span><\/p>\n<\/li>\n

  • \n

    General marine engines<\/span><\/p>\n<\/li>\n<\/ul>\n

    Compatible engine brands include Honda\u00ae, Mercury\u00ae, Yamaha\u00ae, Johnson\u00ae\/Evinrude\u00ae, Bombardier\/BRP\u00ae, Suzuki\u00ae, Nissan\u00ae, Tohatsu\u00ae, OMC\u00ae, Volvo Penta\u00ae, Mercruiser\u00ae, Chevrolet\u00ae, Ford\u00ae<\/strong>, or any engine requiring the following specifications:<\/span><\/p>\n

      \n
    • \n

      NMMA FC-W Catalyst Compatible<\/strong><\/span><\/p>\n<\/li>\n

    • \n

      API SM<\/strong><\/span><\/p>\n<\/li>\n<\/ul>\n

      Note:<\/strong> AMSOIL 10W-40 Synthetic 4-Stroke Marine Oil can be used as a direct replacement for Honda\u00ae 5W-40<\/strong> engine oil.<\/span><\/p>\n

      \n

      Service Life<\/strong><\/span><\/h3>\n
        \n
      • \n

        Outboard & general marine engines:<\/strong> Change oil according to the engine manufacturer\u2019s recommendations due to potential water contamination and oil dilution.<\/span><\/p>\n<\/li>\n

      • \n

        Inboard & I\/O 4-stroke engines:<\/strong> Provides up to 2x the manufacturer\u2019s recommended oil change interval or 1 year<\/strong> (whichever comes first).<\/span><\/p>\n<\/li>\n<\/ul>\n

        \n

        Compatibility with Other Oils<\/strong><\/span><\/h3>\n

        AMSOIL 4-Stroke Synthetic Marine Oil is compatible with conventional and other synthetic motor oils. However, mixing oils reduces the performance and extended-drain benefits of AMSOIL oil. AMSOIL does not<\/strong> recommend the use of aftermarket oil additives with this product.<\/span><\/p>\n

        Specifications<\/strong><\/span><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/article>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
        \n
        TYPICAL TECHNICAL PROPERTIES<\/strong><\/div>\n<\/td>\n<\/tr>\n
        \n
        AMSOIL\u00a0<\/strong>10W-40 Synthetic Formula 4-Stroke Marine Oil<\/strong><\/div>\n<\/td>\n<\/tr>\n
        Kinematic Viscosity @ 100\u00b0C, cSt (ASTM D445)<\/td>\n\n
        14.1<\/div>\n<\/td>\n<\/tr>\n
        Kinematic Viscosity @ 40\u00b0C, cSt (ASTM D445)<\/td>\n\n
        93.3<\/div>\n<\/td>\n<\/tr>\n
        Viscosity Index (ASTM D2270)<\/td>\n\n
        155<\/div>\n<\/td>\n<\/tr>\n
        Pour Point \u00b0C (\u00b0F) (ASTM D97)<\/td>\n\n
        -38 (-36)<\/div>\n<\/td>\n<\/tr>\n
        Flash Point \u00b0C (\u00b0F) (ASTM D92)<\/td>\n\n
        240 (464)<\/div>\n<\/td>\n<\/tr>\n
        High Temperature\/High Shear Viscosity, cP (ASTM D5481)<\/td>\n\n
        4.2<\/div>\n<\/td>\n<\/tr>\n
        Four-Ball Wear Test (ASTM D4172 @40kgf, 150\u00b0C, 1800rpm, 1hr), Scar, mm<\/td>\n\n
        0.4<\/div>\n<\/td>\n<\/tr>\n
        NOACK Volatility, % weight loss (g\/100g) (ASTM D5800)<\/td>\n\n
        7.5<\/div>\n<\/td>\n<\/tr>\n
        Total Base Number (ASTM D2896)<\/td>\n7.9<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

        \n","protected":false},"excerpt":{"rendered":"

        \u00a0 \u00a010W-40 Synthetic Formula 4-Stroke Marine Oil General InformationAMSOIL 10W-40 Synthetic 4-Stroke Marine Oil is specially formulated for marine engines, providing outstanding wear protection, excellent viscosity stability, low volatility, and superior rust prevention. It is certified by NMMA FC-W and Warranty Certified for use in 4-stroke outboard engines, inboard engines, and general marine engines. Benefits […]\n","protected":false},"featured_media":2212,"template":"","meta":[],"product_brand":[],"product_cat":[71,77],"product_tag":[],"class_list":{"0":"post-2225","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-2-4-stroke-engine","7":"product_cat-marine-boat-products","9":"first","10":"instock","11":"shipping-taxable","12":"product-type-simple"},"yoast_head":"\n10W-40 Synthetic Formula 4-Stroke Marine Oil - dextrous-lubricant<\/title>\n<meta name=\"robots\" content=\"noindex, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"10W-40 Synthetic Formula 4-Stroke Marine Oil - dextrous-lubricant\" \/>\n<meta property=\"og:description\" content=\"\u00a0 \u00a010W-40 Synthetic Formula 4-Stroke Marine Oil General InformationAMSOIL 10W-40 Synthetic 4-Stroke Marine Oil is specially formulated for marine engines, providing outstanding wear protection, excellent viscosity stability, low volatility, and superior rust prevention. It is certified by NMMA FC-W and Warranty Certified for use in 4-stroke outboard engines, inboard engines, and general marine engines. 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