{"product_id":"docs-diesel-5w-40-full-synthetic-heavy-duty-diesel-oil-4-gallons-docs5w40-4","title":"Doc's Diesel 5W-40 Full Synthetic Heavy Duty Diesel Oil | 4 Gallons | DOCS5W40-4","description":"\u003ch2\u003eOverview\u003c\/h2\u003e\u003cp\u003eDoc's Diesel 5W-40 Full Synthetic Heavy Duty Diesel Oil is engineered for modern diesel engines, from emissions-aware on-road rigs to durable older models. Formulated with premium synthetic base oils and CK-4 additives, it resists oxidation, helps maintain viscosity under high heat, and supports engine durability in severe conditions. The blend is designed to withstand challenges from EGR and DPF systems while delivering consistent performance across a broad temperature range.\u003c\/p\u003e\u003ch3\u003eWhat you get\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eExcellent wear protection for high-mileage fleets and new engines alike.\u003c\/li\u003e\n\u003cli\u003eOxidation resistance and controlled viscosity for dependable protection during long-haul or heavy-duty use.\u003c\/li\u003e\n\u003cli\u003eFast cold-start protection for chilly mornings and startup moments.\u003c\/li\u003e\n\u003cli\u003eStay-in-grade shear stability to help viscosity stay consistent under heavy loads.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eUsage and maintenance considerations\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eFollow your vehicle manufacturer's service intervals; typical ranges vary by duty: standard service often falls around 10,000–15,000 miles, while severe service may require more frequent changes.\u003c\/li\u003e\n\u003cli\u003eSuitable for on-road and off-road duties, including equipment with EGR and DPF systems, with robust performance across temperature ranges.\u003c\/li\u003e\n\u003cli\u003eIn cold climates, benefits include quicker lubrication during startup and reduced wear at start-up moments.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eSpecifications and compatibility: Doc's Diesel 5W-40 meets API CJ-4\/CK-4 and aligns with a broad set of OEM expectations, suitable for both new emissions-compliant engines and older diesel engines. Doc's also offers a complete line of filters engineered to meet or exceed OEM standards, providing a cohesive approach to maintenance and reliability.\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: Which engines and specs does Doc's Diesel 5W-40 meet?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: It meets API CJ-4\/CK-4 and aligns with multiple OEM requirements for both modern and older diesel engines.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: How often should I change Doc's Diesel 5W-40?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Follow manufacturer guidelines; typical ranges are 7,500–10,000 miles for severe service and 10,000–15,000 miles for standard duty.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Doc's Auto Parts","offers":[{"title":"Default Title","offer_id":42397718118485,"sku":"B0FTJCZBZ5","price":258.81,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0632\/3270\/4597\/files\/docs-diesel-5w40-full-synthetic-oil-bottle-front.jpg?v=1776061773","url":"https:\/\/plentytorque.co.uk\/products\/docs-diesel-5w-40-full-synthetic-heavy-duty-diesel-oil-4-gallons-docs5w40-4","provider":"PlentyTorque","version":"1.0","type":"link"}