| Product Code | Package Size | Unit of Measure |
|---|---|---|
| SBDF1G-EA | Gallon Jug | Each |
| SBDF1G-CA | Gallon Jug | Case of 4 |
| SBDFTP-EA | 2.5 Gallon Jug | Each |
| SBDFTP-CA | 2.5 Gallon Jug | Case of 2 |
| SBDF55-EA | 55 Gallon Drum | Each |
| SBDF27-EA | 275 Gallon Tote | Each |
AMSOIL 15W-40 Commercial-Grade Diesel Oil is an advanced synthetic-blend formulation built to protect diesel engines in commercial trucks, heavy equipment, and fleet vehicles. With greater than 50% synthetic content and 2X the wear protection required by Detroit Diesel's DD13 Scuffing Test, it delivers a meaningful step up from conventional and lower-grade synthetic-blend 15W-40 diesel oils.
Diesel engines in commercial service face relentless stress. High combustion pressures, heavy loads, extreme heat cycles, and soot accumulation all take a toll on rings, liners, and bearings. Conventional 15W-40 oils can lose viscosity control as soot levels climb, accelerating wear in the very components that keep compression and fuel economy intact. The cost of that wear shows up in oil consumption, reduced power, and unplanned downtime.
2X MORE WEAR PROTECTION THAN THE DETROIT DIESEL STANDARD
Third-party testing in the Detroit Diesel DD13 Scuffing Test for specification DFS 93K222 shows AMSOIL Commercial-Grade Diesel Oil delivers 2X more protection against cylinder liner scuffing than the specification requires. Scuffing damage on liners leads directly to blow-by, higher oil consumption, and lost compression. This level of protection helps extend engine life in hard-working applications like Cummins ISX-powered Kenworths and Peterbilts, Ford 6.0L and 6.7L Power Stroke pickups, Caterpillar-equipped dozers and excavators, and Volvo D13 Class 8 trucks.
VISCOSITY CONTROL UNDER HIGH SOOT LOADS
Soot is unavoidable in diesel combustion. The problem starts when soot particles agglomerate into larger clusters that thicken the oil and abrade metal surfaces. AMSOIL Commercial-Grade Diesel Oil uses high-performance detergent and dispersant additives to keep soot particles suspended independently, preventing that chain reaction. The greater-than-50% synthetic base oil content resists viscosity change better than conventional formulations, maintaining the oil's protective film strength across the drain interval.
EXTREME TEMPERATURE PERFORMANCE
Cold starts in northern climates and sustained high-temperature operation in the summer both demand a lot from engine oil. AMSOIL Commercial-Grade Diesel Oil flows dependably at low temperatures for reliable startup protection in cold weather. A CCS viscosity of 5226 cP at -20°C confirms solid cold-cranking performance. On the hot side, improved oxidation resistance compared to conventional diesel oils helps the oil maintain its integrity under sustained thermal stress, keeping engines cleaner and preserving power and fuel efficiency.
MINIMIZES OIL CONSUMPTION
Oil volatility matters in diesel engines, especially turbocharged ones where high operating temperatures can drive lighter oil molecules into the combustion chamber. AMSOIL Commercial-Grade Diesel Oil posts a NOACK volatility of just 4.6% weight loss, meaning less oil burns off during operation. Lower volatility translates to reduced oil consumption between changes, fewer combustion chamber deposits, and longer aftertreatment system life, including diesel particulate filters and diesel oxidation catalysts.
SPECIFICATIONS AND COMPATIBILITY
AMSOIL 15W-40 Commercial-Grade Diesel Oil meets or exceeds the following specifications, making it suitable for a wide range of on-road and off-road diesel and gasoline applications:
Compatible with other conventional and synthetic oils, though mixing will reduce its performance benefits. Aftermarket oil additives are not recommended.
SERVICE LIFE
AMSOIL Commercial-Grade Diesel Oil is recommended for the drain intervals stated by the original equipment manufacturer. Intervals may be extended beyond OEM recommendations with supporting oil analysis.
| Property | 15W-40 (SBDF) | Test Method |
|---|---|---|
| Kinematic Viscosity @ 100°C, cSt | 15.2 | ASTM D445 |
| Kinematic Viscosity @ 40°C, cSt | 112.1 | ASTM D445 |
| Viscosity Index | 141 | ASTM D2270 |
| CCS Viscosity @ °C, cP | 5226 (-20) | ASTM D5293 |
| Flash Point, °C (°F) | 238 (460) | ASTM D92 |
| Fire Point, °C (°F) | 248 (478) | ASTM D92 |
| Pour Point, °C (°F) | -36 (-33) | ASTM D97 |
| Four-Ball Wear Test, Scar, mm | 0.46 | ASTM D4172 |
| NOACK Volatility, % weight loss (g/100g) | 4.6 | ASTM D5800 |
| Total Base Number | 10.0 | ASTM D2896 |
| High-Temperature/High-Shear Viscosity, cP | 4.6 | ASTM D5481 |
| Sulfated Ash Content, wt. % | 1.0 | — |
What vehicles and equipment is AMSOIL 15W-40 Commercial Grade Diesel Oil designed for?
AMSOIL 15W-40 Commercial Grade Diesel Oil is designed for a wide range of both on-road and off-road diesel applications. It meets or exceeds OEM requirements for heavy-duty on-road trucks, heavy-duty off-road equipment, agricultural machinery, auto/light trucks, motorcycles, ATVs, UTVs, snowmobiles, marine outboard engines, and PWCs. Verified users have reported success running it in engines such as the Ford 6.0L Power Stroke and Cummins ISX with over 650,000 miles.
How does AMSOIL 15W-40 Commercial Grade Diesel Oil protect heavy-duty diesel engines from wear?
AMSOIL 15W-40 Commercial Grade Diesel Oil delivers 2X more wear protection than required by Detroit Diesel's standard, based on third-party testing in the Detroit Diesel DD13 Scuffing Test for specification DFS 93K222. This enhanced wear protection helps maximize equipment life and reduce maintenance costs and downtime. The formulation also keeps soot particles suspended independently, preventing them from clumping into larger, wear-causing particles.
What specifications does AMSOIL 15W-40 Commercial Grade Diesel Oil meet?
AMSOIL 15W-40 Commercial Grade Diesel Oil meets or exceeds original equipment manufacturer requirements for both on-road and off-road diesel applications. Its wear protection was validated through third-party testing in the Detroit Diesel DD13 Scuffing Test for specification DFS 93K222, where it delivered 2X more protection than required by the standard. Full specification details are available on the AMSOIL product data sheet.
How does AMSOIL 15W-40 Commercial Grade Diesel Oil compare to conventional and other synthetic-blend diesel oils?
AMSOIL 15W-40 Commercial Grade Diesel Oil contains greater than 50% synthetic base oil, which is a higher synthetic content than many competing synthetic-blend diesel oils. This higher synthetic content delivers improved heat and oxidation resistance, better viscosity control, and minimized oil consumption compared to other synthetic-blend and conventional diesel oils. Verified fleet users have reported better fuel mileage and lower engine temperatures after switching to this product.
How often should I change AMSOIL 15W-40 Commercial Grade Diesel Oil in my diesel truck or equipment?
AMSOIL recommends following your vehicle or equipment manufacturer's recommended oil change intervals when using 15W-40 Commercial Grade Diesel Oil. Verified users running heavy-duty applications, such as a Cummins ISX with over 650,000 miles, have reported changing this oil every 12,000 to 15,000 miles. The product's greater than 50% synthetic content helps minimize viscosity change and maintain protection throughout the service interval, but always consult your OEM guidelines.
Is AMSOIL 15W-40 Commercial Grade Diesel Oil safe to use in both on-road diesel trucks and off-road equipment?
Yes, AMSOIL 15W-40 Commercial Grade Diesel Oil is formulated to meet or exceed OEM requirements in both on-road and off-road diesel applications. It is suitable for heavy-duty on-road trucks, off-road construction and industrial equipment, agricultural machinery, and light-duty diesel vehicles. Its formulation provides clean engine operation, dependable cold-temperature flow for reliable startups, and improved heat resistance to help maintain power and fuel efficiency across demanding operating environments.
Product Details PDF - AMSOIL 15W-40 COMMERCIAL GRADE DIESEL OIL
