{"product_id":"schaeffer-synshield-otr-plus-full-synthetic-diesel-engine-oil-5w-40-1-gallon-ck-4-wear-soot-protection","title":"Schaeffer SynShield OTR Plus full synthetic diesel engine oil 5W-40, 1‑Gallon — CK-4 wear \u0026 soot protection","description":"\u003cp\u003e\u003cstrong\u003eSchaeffer SynShield OTR Plus 5W-40 is a full synthetic heavy-duty diesel engine oil engineered to reduce wear, control soot and support fuel economy in modern EGR and DPF-equipped diesel engines.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eBuilt for on- and off-road diesel applications, Schaeffer Manufacturing Co.'s 9000CK4-006S SynShield OTR Plus delivers advanced protection for engines meeting API CK-4 requirements. This synthetic-plus formulation blends proprietary friction modifiers, Micron Moly and Penetro, to form a tenacious lubricating film that helps prevent metal-to-metal contact while resisting oxidation and deposit buildup. It’s designed for engines using heavy exhaust gas recirculation (EGR) and exhaust after-treatment systems such as diesel particulate filters (DPFs), with a viscosity rating that balances cold-start performance and high-temperature strength.\u003c\/p\u003e\n\n\u003ch3\u003eHow does SynShield OTR Plus protect engines under heavy-duty conditions?\u003c\/h3\u003e\n\u003cp\u003eSynShield OTR Plus focuses on wear reduction and deposit control through a combination of synthetic base stocks and targeted additives. The formula resists oxidation and soot-related thickening, so oil life and lubricity remain stable in severe duty cycles.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eMicron Moly and Penetro create a slippery protective layer against metal-to-metal wear.\u003c\/li\u003e\n  \u003cli\u003eHigh thermal stability resists breakdown at elevated operating temperatures.\u003c\/li\u003e\n  \u003cli\u003eSoot-dispersing chemistry keeps oil flowing and reduces deposits.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill this 5W-40 oil help with cold starts and everyday drivability?\u003c\/h3\u003e\n\u003cp\u003eThe 5W-40 viscosity offers easier cold-weather pumpability than heavier grades while maintaining film strength at operating temperature. That balance improves startability in low temperatures without sacrificing protection during typical highway or load conditions.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e5W cold rating improves oil circulation at startup.\u003c\/li\u003e\n  \u003cli\u003e40-grade hot viscosity preserves lubricating film under load.\u003c\/li\u003e\n  \u003cli\u003eDesigned for consistent performance in mixed duty cycles.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIs SynShield OTR Plus compatible with modern emissions systems like DPF and SCR?\u003c\/h3\u003e\n\u003cp\u003eYes — this formulation is suitable for 2007 and 2010 emissions-compliant engines that rely on heavy EGR and after-treatment devices. It’s engineered to be used with or without diesel oxidation catalysts (DOCs), diesel particulate filters (DPFs) and selective catalytic reduction (SCR) systems.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eAPI CK-4 performance level meets contemporary diesel engine specs.\u003c\/li\u003e\n  \u003cli\u003eFormulated to minimize ash and soot effects on DPF function.\u003c\/li\u003e\n  \u003cli\u003eWorks with exhaust after-treatment hardware to maintain system compatibility.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does this oil contribute to fuel economy and maintenance intervals?\u003c\/h3\u003e\n\u003cp\u003eSchaeffer’s SynShield OTR Plus aims to preserve fuel economy through low internal friction and stable viscosity control across operating temperatures. By limiting oxidation, aeration and deposit formation, it helps maintain engine efficiency and may extend effective drain intervals when used according to manufacturer recommendations.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eProprietary friction modifiers reduce parasitic drag for improved efficiency.\u003c\/li\u003e\n  \u003cli\u003eResistance to aeration maintains consistent hydraulic and lubrication performance.\u003c\/li\u003e\n  \u003cli\u003eKeep-clean performance supports longer effective oil life under soot-laden conditions.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? Schaeffer SynShield OTR Plus 5W-40 is aimed at fleet managers, owner-operators and diesel equipment owners who need a full synthetic, heavy-duty engine oil that balances cold-start ease, high-temperature protection and compatibility with modern EGR and DPF systems. Choose this 1-gallon bottle for service garages, mobile techs, mixed-service fleets, or any user seeking an API CK-4-rated synthetic oil engineered to fight wear, control soot, and help maintain fuel economy without sacrificing engine durability.\u003c\/p\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 SynShield OTR Plus 5W-40 API certified?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. SynShield OTR Plus meets API CK-4 specifications for heavy-duty diesel engines.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I use this oil with diesel particulate filters (DPFs)?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The formula is suitable for engines with DPFs and other after-treatment systems when used per manufacturer guidance.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Schaeffer Manufacturing Co","offers":[{"title":"Default Title","offer_id":48081172431006,"sku":"B08BW72P1H","price":94.98,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/schaeffer-synshield-otr-plus-5w40-front-bottle.jpg?v=1785797856","url":"https:\/\/northtrailauto.ca\/products\/schaeffer-synshield-otr-plus-full-synthetic-diesel-engine-oil-5w-40-1-gallon-ck-4-wear-soot-protection","provider":"North Trail Auto","version":"1.0","type":"link"}