{"product_id":"royal-purple-duralec-super-5w-40-ck-4-diesel-engine-oil-1-gallon-emissions-compliant-dpf-scr-safe","title":"Royal Purple Duralec Super 5W-40 CK-4 Diesel Engine Oil — 1 Gallon, Emissions‑Compliant \u0026 DPF\/SCR Safe","description":"\u003cp\u003e\u003cstrong\u003eRoyal Purple Duralec Super 5W-40 CK-4 is a synthetic diesel engine oil formulated for modern emissions systems that helps protect components, improve fuel performance, and extend drain intervals.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eDesigned for diesel engines that must use emissions-compliant lubricants, this 1-gallon Royal Purple Duralec Super 5W-40 (SKU 83540) meets API CK-4 performance requirements for North American and European ultra-low sulfur diesel. The formulation balances high-temperature stability with low-temperature pumpability to limit startup wear, support exhaust aftertreatment devices like DPFs and SCR systems, and maintain protection across a wide range of operating conditions.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this oil protect modern diesel emissions equipment?\u003c\/h3\u003e\n\u003cp\u003eDuralec Super is engineered to be compatible with diesel particulate filters, selective catalytic reduction, EGR and catalytic converters by controlling deposits and managing ash levels. Its base oils and additive package are selected to support emissions systems while providing robust protection for internal components.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eFormulated to preserve DPF and SCR function by controlling soot and deposits.\u003c\/li\u003e\n  \u003cli\u003eAPI CK-4 licensing for compatibility with modern diesel engines.\u003c\/li\u003e\n  \u003cli\u003eBalanced additive chemistry to reduce ash-related fouling of aftertreatment devices.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat performance can I expect in hot and cold conditions?\u003c\/h3\u003e\n\u003cp\u003eThis 5W-40 grade offers cold-start flow performance at lower temperatures while retaining shear stability and film strength at high operating temperatures. The result is reduced wear during startup and dependable protection under sustained load and heat.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e5W-40 viscosity for easier cold pumping and reliable high-temp film strength.\u003c\/li\u003e\n  \u003cli\u003eHigh-temperature breakdown resistance to protect bearings and pistons under load.\u003c\/li\u003e\n  \u003cli\u003eLow-temperature pumpability to reduce startup wear in cooler climates.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does it affect maintenance intervals and fuel economy?\u003c\/h3\u003e\n\u003cp\u003eRoyal Purple formulates Duralec Super to help extend drain intervals where manufacturer recommendations and service conditions allow, by resisting oxidation and controlling contaminants. The oil’s friction modifiers and stable viscosity profile can also contribute to improved fuel efficiency compared with less advanced formulations.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eOxidation resistance helps maintain oil performance over longer drains.\u003c\/li\u003e\n  \u003cli\u003eFriction control elements support reduced internal friction and improved fuel performance.\u003c\/li\u003e\n  \u003cli\u003eCorrosion inhibitors protect metal surfaces during extended service periods.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhich engines and applications is this oil appropriate for?\u003c\/h3\u003e\n\u003cp\u003eDuralec Super 5W-40 CK-4 is formulated for modern heavy-duty diesel engines requiring CK-4 oils and for equipment fitted with emissions control devices. It is suited for on-highway trucks, vocational equipment, and any diesel application where API CK-4 and a 5W-40 viscosity are specified.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eMeets API CK-4 for 2007–2010 emissions-era diesel engines and newer where CK-4 is acceptable.\u003c\/li\u003e\n  \u003cli\u003eWorks with ultra-low sulfur diesel fuels common in North America and Europe.\u003c\/li\u003e\n  \u003cli\u003eAppropriate for engines with DPF, EGR, SCR, and catalytic converters.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: Royal Purple Duralec Super 5W-40 CK-4 is targeted at fleet managers, owner-operators, and equipment owners who need an emissions-compliant synthetic diesel oil that balances protection, drain-life potential, and fuel performance. Choose this 1-gallon pack when your engine manual calls for a CK-4 oil in the 5W-40 viscosity and you want a premium formulation designed for modern diesel exhaust aftertreatment systems.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eFeatures\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eGreater wear protection\u003c\/li\u003e\n  \u003cli\u003eImproves fuel economy\u003c\/li\u003e\n  \u003cli\u003eSuperior corrosion protection\u003c\/li\u003e\n  \u003cli\u003eAPI-licensed CK-4 diesel motor oil\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is this oil safe for engines with a DPF or SCR?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. Duralec Super 5W-40 CK-4 is formulated for engines with DPF, SCR, EGR, and catalytic converters when CK-4 oils are specified.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can this product extend oil drain intervals?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: It’s formulated to resist oxidation and help extend drains where engine manufacturer guidelines and operating conditions permit.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Royal Purple","offers":[{"title":"Default Title","offer_id":48084109033630,"sku":"B00X1JPT0S","price":72.47,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/royal-purple-duralec-super-5w40-front-gallon.jpg?v=1785846567","url":"https:\/\/northtrailauto.ca\/products\/royal-purple-duralec-super-5w-40-ck-4-diesel-engine-oil-1-gallon-emissions-compliant-dpf-scr-safe","provider":"North Trail Auto","version":"1.0","type":"link"}