Doc's Diesel 15W-40 Full Synthetic Heavy-Duty Diesel Oil
Doc's Diesel 15W-40 Full Synthetic Heavy-Duty Diesel Oil
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Howling Moto receives compensation from Doc's Diesel for the purchase of this product.
Doc's Diesel Engine Oil:
Powered by Hot Shot's Secret the 15W-40 Full Synthetic Heavy Duty Diesel Engine Oil is a CK-4 specification additive package built with synthetic group III base oils, and contains the patented FR3 Nano Technology to provide the absolute best level of protection to your diesel engine.
The FR3 Nano Technology infusion provides protection, longevity, and performance gains that other synthetic oils will not allow.
Product Details:
INCREASED EFFICIENCY: The blended friction reducing agents provide an unmatched level of technology that enhances performance, increases fuel economy and is proven to provide up to 78% less oil consumption than the specification during the CAT 1N test.
SUPERIOR PROTECTION: Protects down to the nano level and resists shearing under the most extreme temperatures. The included additive package has proven to reduce wear up to 71% in Cummins ISM severe service test.
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:
D15W40
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)




















