{"id":3645,"date":"2026-07-16T14:16:40","date_gmt":"2026-07-16T07:16:40","guid":{"rendered":"https:\/\/www.dextrous-lubricant.com\/?post_type=product&#038;p=3645"},"modified":"2026-07-16T14:30:04","modified_gmt":"2026-07-16T07:30:04","slug":"15w-40-synthetic-heavy-duty-diesel-marine-motor-oil","status":"publish","type":"product","link":"https:\/\/www.dextrous-lubricant.com\/en\/product\/15w-40-synthetic-heavy-duty-diesel-marine-motor-oil\/","title":{"rendered":"15W-40 Synthetic Heavy Duty Diesel &#038; Marine Motor Oil"},"content":{"rendered":"<p><a href=\"https:\/\/www.dextrous-lubricant.com\/wp-content\/uploads\/2026\/07\/15W-40-Heavy-Duty-Diesel-and-Marine-Oil-1.pdf\" target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" class=\"alignnone wp-image-2540\" src=\"https:\/\/www.dextrous-lubricant.com\/wp-content\/uploads\/2025\/06\/folder_result.webp\" alt=\"\" width=\"60\" height=\"60\" srcset=\"https:\/\/www.dextrous-lubricant.com\/wp-content\/uploads\/2025\/06\/folder_result.webp 512w, https:\/\/www.dextrous-lubricant.com\/wp-content\/uploads\/2025\/06\/folder_result-300x300.webp 300w, https:\/\/www.dextrous-lubricant.com\/wp-content\/uploads\/2025\/06\/folder_result-150x150.webp 150w, https:\/\/www.dextrous-lubricant.com\/wp-content\/uploads\/2025\/06\/folder_result-100x100.webp 100w\" sizes=\"(max-width: 60px) 100vw, 60px\" \/><strong>15W-40 Heavy-Duty Diesel and Marine Oil<\/strong><\/a><\/p>\n<hr \/>\n<ul>\n<li><b>Not for use with engines <\/b><b>equipped with exhaust <\/b><b>aftertreatment systems, <\/b><b>including DPF and SCR<\/b><\/li>\n<li><b>Try Signature Series <\/b><b>Max-Duty 15W-40 <\/b><b>for a serious upgrade.<\/b><\/li>\n<\/ul>\n<hr \/>\n<p class=\"cvGsUA block-font-kerning-none block-font-feature-liga-off block-font-feature-clig-off block-font-feature-calt-off direction-ltr align-start para-style-body\"><strong><span class=\"a_GcMg font-feature-liga-off font-feature-clig-off font-feature-calt-off text-decoration-none text-strikethrough-none\">Extends Drain Intervals<\/span><\/strong><\/p>\n<p>AMSOIL Synthetic Heavy Duty Diesel &amp; Marine Motor Oil can extend drain intervals far beyond those recommended for conventional petroleum oils. Its unique synthetic formulation and long-drain additive chemistry deliver maximum engine protection, cleanliness and performance over extended drain intervals, reducing vehicle maintenance and waste-oil disposal costs.<\/p>\n<hr \/>\n<p class=\"cvGsUA block-font-kerning-none block-font-feature-liga-off block-font-feature-clig-off block-font-feature-calt-off direction-ltr align-start para-style-body\"><strong><span class=\"a_GcMg font-feature-liga-off font-feature-clig-off font-feature-calt-off text-decoration-none text-strikethrough-none\">Controls Soot and Wear<\/span><\/strong><\/p>\n<p class=\"cvGsUA block-font-kerning-none block-font-feature-liga-off block-font-feature-clig-off block-font-feature-calt-off direction-ltr align-start para-style-body\">AMSOIL Synthetic Heavy Duty Diesel &amp; Marine Motor Oil is heavily fortified with detergent\/dispersant additives and is naturally resistant to soot. It is designed to keep soot particles suspended independently and prevent them from aggregating to form larger, wear-causing particles. Viscosity increase is minimized and soot-related wear is reduced.<\/p>\n<hr \/>\n<p class=\"cvGsUA block-font-kerning-none block-font-feature-liga-off block-font-feature-clig-off block-font-feature-calt-off direction-ltr align-start para-style-body\"><strong><span class=\"a_GcMg font-feature-liga-off font-feature-clig-off font-feature-calt-off text-decoration-none text-strikethrough-none\">Reduces Oil Consumption and Emissions<\/span><\/strong><\/p>\n<p>AMSOIL Synthetic Heavy Duty Diesel &amp; Marine Motor Oil has lower volatility than conventional petroleum oils. Oil consumption and emissions are minimized due to less vapor passing into the combustion chamber. Lower volatility helps AMSOIL 15W-40 Diesel Oil retain its viscosity after high-temperature service for continued dependable protection.<\/p>\n<hr \/>\n<p class=\"cvGsUA block-font-kerning-none block-font-feature-liga-off block-font-feature-clig-off block-font-feature-calt-off direction-ltr align-start para-style-body\"><strong><span class=\"a_GcMg font-feature-liga-off font-feature-clig-off font-feature-calt-off text-decoration-none text-strikethrough-none\">Excellent Cold-Flow Properties<\/span><\/strong><\/p>\n<p>AMSOIL Synthetic Heavy Duty Diesel &amp; Marine Motor Oil eases cold-weather starting and provides vital startup lubrication to help prevent engine wear. It outperforms conventional 15W-40 petroleum oils and minimizes the impact of cold-weather operation.<\/p>\n<hr \/>\n<p class=\"cvGsUA block-font-kerning-none block-font-feature-liga-off block-font-feature-clig-off block-font-feature-calt-off direction-ltr align-start para-style-body\"><strong><span class=\"a_GcMg font-feature-liga-off font-feature-clig-off font-feature-calt-off text-decoration-none text-strikethrough-none\"><u>APPLICATIONS<\/u><\/span><\/strong><\/p>\n<p>AMSOIL Synthetic Heavy Duty Diesel &amp; Marine Motor Oil is engineered for use in a wide variety of light- and heavy-duty applications not equipped with exhaust aftertreatment systems, including over-the-road trucks, off-road construction, marine engines, farm equipment, mining, industrial (pumps &amp; generators) and personal automotive or commercial transportation. It is excellent for use with low- or high-sulfur diesel fuels in standard, turbocharged or supercharged engines, including diesels equipped with EGR systems.<\/p>\n<p>Use AMSOIL Synthetic Heavy Duty Diesel &amp; Marine Motor Oil in diesel engines, gasoline engines and other applications that require any of the following specifications:<\/p>\n<p class=\"cvGsUA block-font-kerning-none block-font-feature-liga-off block-font-feature-clig-off block-font-feature-calt-off direction-ltr align-start para-style-body\"><span class=\"a_GcMg font-feature-liga-off font-feature-clig-off font-feature-calt-off text-decoration-none text-strikethrough-none\">SAE 15W-40; API CI-4+\/CI-4\/CH-4\/CF\/CF-2\/SL\/SJ; ACEA A3\/B3, E2, E3, E5, E7; Global DHD-1; JASO DH-1; Mack EO-M, EO-N; DDC 93K214; Caterpillar ECF-1A, ECF-2; Cummins CES 20076, 20077, 20078; Volvo VDS-2, VDS-3; MB 228.1, 228.3, 229.1; MAN 271, 3275; MTU Type II<\/span><\/p>\n<hr \/>\n<p class=\"cvGsUA block-font-kerning-none block-font-feature-liga-off block-font-feature-clig-off block-font-feature-calt-off direction-ltr align-start para-style-body\"><strong><span class=\"a_GcMg font-feature-liga-off font-feature-clig-off font-feature-calt-off text-decoration-none text-strikethrough-none\"><u>COMPATIBILITY<\/u><\/span><\/strong><\/p>\n<p data-path-to-node=\"1\"><span class=\"citation-68 citation-end-68\">AMSOIL Synthetic Heavy Duty Diesel &amp; Marine Oil is compatible with conventional and synthetic motor oils. Mixing AMSOIL motor oils with other oil, however, will shorten the oil&#8217;s life expectancy and reduce t<\/span>he performance benefits.<\/p>\n<p data-path-to-node=\"2\">AMSOIL does <strong>not support extended drain intervals<\/strong> where oils have been mixed.<\/p>\n<p data-path-to-node=\"3\">Aftermarket oil additives are <strong>not recommended<\/strong> for use with AMSOIL motor oils.<\/p>\n<hr \/>\n<p class=\"cvGsUA block-font-kerning-none block-font-feature-liga-off block-font-feature-clig-off block-font-feature-calt-off direction-ltr align-start para-style-body\"><strong><span class=\"a_GcMg font-feature-liga-off font-feature-clig-off font-feature-calt-off text-decoration-none text-strikethrough-none\"><u>SERVICE LIFE<\/u><\/span><\/strong><\/p>\n<p data-path-to-node=\"1\"><b data-path-to-node=\"1\" data-index-in-node=\"0\">Diesel Engine Service<\/b> : Three times (3X) OEM* recommendation, not to exceed <span class=\"citation-89 citation-end-89\">50,000 miles\/600 hours or one year, whichever comes first. Drain intervals may be extended further with oil analysis.<\/span><\/p>\n<p data-path-to-node=\"2\"><b data-path-to-node=\"2\" data-index-in-node=\"0\"><span class=\"citation-88 citation-end-88\">Gasoline Engine Service<\/span><\/b> : <span class=\"citation-87 citation-end-87\">Two times (2X) OEM* recommendation, not to exceed 15,000 miles or one year,<\/span> whichever comes first.<\/p>\n<p data-path-to-node=\"3\"><span style=\"color: #ff0000;\">*Operating conditions and drain intervals for severe and normal service are defined by the OEM. Refer to your owner&#8217;s manual.<\/span><\/p>\n<p data-path-to-node=\"4\"><i data-path-to-node=\"4\" data-index-in-node=\"0\"><b data-path-to-node=\"4\" data-index-in-node=\"0\">Note:<\/b> Extended drain intervals are not recommended when using biofuels containing &gt;10% ethanol or 10% biodiesel (B10). Follow OEM drain intervals or extend drain intervals with oil analysis.<\/i><\/p>\n<hr \/>\n<p><b><strong><span class=\"a_GcMg font-feature-liga-off font-feature-clig-off font-feature-calt-off text-decoration-none text-strikethrough-none\"><u>TYPICAL TECHNICAL PROPERTIES<\/u><\/span><\/strong><\/b><\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-3641\" src=\"https:\/\/www.dextrous-lubricant.com\/wp-content\/uploads\/2026\/07\/Capture.jpg\" alt=\"\" width=\"1150\" height=\"419\" srcset=\"https:\/\/www.dextrous-lubricant.com\/wp-content\/uploads\/2026\/07\/Capture.jpg 1150w, https:\/\/www.dextrous-lubricant.com\/wp-content\/uploads\/2026\/07\/Capture-300x109.jpg 300w, https:\/\/www.dextrous-lubricant.com\/wp-content\/uploads\/2026\/07\/Capture-1024x373.jpg 1024w, https:\/\/www.dextrous-lubricant.com\/wp-content\/uploads\/2026\/07\/Capture-768x280.jpg 768w, https:\/\/www.dextrous-lubricant.com\/wp-content\/uploads\/2026\/07\/Capture-600x219.jpg 600w\" sizes=\"(max-width: 1150px) 100vw, 1150px\" \/><\/p>\n","protected":false},"excerpt":{"rendered":"<p><strong>Premium Protection for Severe-Service Diesels<\/strong><\/p>\n<p>AMSOIL Synthetic Heavy Duty Diesel &amp; Marine Motor Oil is a premium diesel oil that provides excellent performance in all types of diesel engines without exhaust aftertreatment systems, where highly effective control of wear and deposits is vital. Engineered with heavy-duty dispersant\/detergent additives, its Total Base Number (TBN) of 12 neutralizes acids and controls soot thickening from exhaust gas recirculation (EGR) and blow-by to protect against corrosion, cylinder bore polishing (wear), varnish and sludge deposits. AMSOIL 15W-40 Diesel Oil resists heat and breakdown better than conventional petroleum<\/p>\n<p>oils for long-lasting performance and protection.<\/p>\n","protected":false},"featured_media":3644,"template":"","meta":[],"product_brand":[],"product_cat":[98,120,77],"product_tag":[],"class_list":["post-3645","product","type-product","status-publish","has-post-thumbnail","product_cat-20000-32000-km","product_cat-80000-km","product_cat-marine-boat-products","first","instock","shipping-taxable","product-type-simple"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>15W-40 Synthetic Heavy Duty Diesel &amp; Marine Motor Oil - dextrous-lubricant<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.dextrous-lubricant.com\/en\/product\/15w-40-synthetic-heavy-duty-diesel-marine-motor-oil\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"15W-40 Synthetic Heavy Duty Diesel &amp; Marine Motor Oil - dextrous-lubricant\" \/>\n<meta property=\"og:description\" content=\"Premium Protection for Severe-Service Diesels  AMSOIL Synthetic Heavy Duty Diesel &amp; Marine Motor Oil is a premium diesel oil that provides excellent performance in all types of diesel engines without exhaust aftertreatment systems, where highly effective control of wear and deposits is vital. Engineered with heavy-duty dispersant\/detergent additives, its Total Base Number (TBN) of 12 neutralizes acids and controls soot thickening from exhaust gas recirculation (EGR) and blow-by to protect against corrosion, cylinder bore polishing (wear), varnish and sludge deposits. 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