Doc's Diesel 15w-40 Semi Synthetic Heavy-duty Diesel Oil

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Doc's Diesel 15W-40 SEMI Synthetic Heavy-Duty Diesel Oil 55 Gallon Drum15W-40 SEMI Synthetic Heavy Duty Diesel Oil 55 Gallon Drum Product Description Doc's Diesel Engine Oil:

Doc's Diesel 15W-40 SEMI Synthetic Heavy Duty Diesel Oil is built for heavy-duty diesel engines that demand superior performance and long-lasting protection. Whether you’re operating a modern emissions-compliant fleet or maintaining reliable older equipment, this advanced formulation is engineered to deliver exceptional durability, cleanliness, and fuel efficiency under the toughest conditions.

Product Details:

• Maximized Engine Protection & Longevity - Advanced additive system protects critical components and resists thermal breakdown, even under high-load, high-heat operating conditions
• Extreme Temperature Protection - Excellent low-temperature pumpability ensures fast lubrication and engine protection during cold starts and harsh weather
• Proven Clean Performance - Enhanced oxidation and thermal stability help reduce sludge and deposits, keeping your engine running cleaner for longer
• Engineered for Modern Emissions Standards - Formulated to meet the GHG 17 (Greenhouse Gas 2017) emissions standards for reduced carbon output and improved fuel economy
• Doc's 15W-40 SEMI Synthetic Diesel Oil Safety Sheet
• Doc's Auto Parts all have an OEM design, fit, and function that meet or exceed OEM Requirements

Fitment:

Vehicle Fitment:

• 2003-2018 Ram 5.9L/6.7L Cummins 2500HD, 3500HD, 4500HD, 5500HD
• 2011-2025 Ford 6.7L Powerstroke
• 1994-2010 Ford 6.0L/6.4L/7.3L Powerstroke
• 2001-2025 Chevrolet/GMC 6.6L Duramax LB7–L5P 2500HD, 3500HD

Doc's Part Number:

DOCS15W40SS-55G

Oil Capacity:

• 6.7L Cummins: 3.012 Gallons (12 Quarts)
• 6.7L Powerstroke: 3.25 Gallons (13 Quarts)
• 6.6L Duramax: 2.5 Gallons (10 Quarts)
• 3.0L Duramax: 1.75 Gallons (7 Quarts)
• 3.0L EcoDiesel: 2.65 Gallons (10.6 Quarts)

Change Interval:

Above all recommendations, change according to your vehicle’s manufacturer's warranty.

• Standard Service (normal duty): Every 10,000 – 15,000 miles maximum, or as recommended by OEM
• Severe Service (heavy loads, towing, dusty or extreme conditions): Every 7,500 – 10,000 miles maximum
• Off-Road / Agricultural / Equipment: Follow manufacturer guidelines (typically 250 – 500 hours)

Payment Payment Policies

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Shipping Shipping Policies

Spend $99 or more and we’ll ship your order free anywhere in the lower 48.

Returns Return Policies

Not satisfied? No problem. You’ve got 30 days to send your parts back as long as they’re unused and in new condition. Just start a return through eBay and we’ll handle the rest.

About Us About Doc's Diesel

At Doc’s Diesel, we make truck maintenance simple and affordable with parts that last. We started with premium filters that meet or beat OEM standards—and we didn’t stop there.
Now we offer brakes, hubs, wipers, oil, and more for Cummins, Powerstroke, Duramax, and EcoDiesel. Everything’s lab-tested and work-tested.
Based in small-town Ohio, and built on hard work, no B.S., and doing the job right.

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