AMSOIL Signature Series Max-Duty 0W-40 Synthetic Diesel Oil
Join the Preferred Customer program to save approximately 25% off the retail price today
Estimated delivery by or sooner
0 units available for local pickup
at National Synthetics — arrange pickup
Ships directly from AMSOIL
Delivered fast from the closest AMSOIL distribution center.
Extreme Cold-Weather Protection for Diesel Engines
AMSOIL Signature Series Max-Duty 0W-40 features the highest viscosity index (180) in the Max-Duty lineup, delivering exceptional protection across the widest temperature range. With a pour point of -48°C (-54°F), it provides instant cold-weather flow for diesel engines in the harshest conditions.
Key Benefits
- 6X more wear protection than required by DD13 Scuffing Test
- Highest viscosity index (180) in Max-Duty lineup
- Extreme cold-weather starting at -48°C (-54°F)
- Extended drain intervals up to 3X OEM recommendation
- 60% better turbo cleanliness protection
- 76% less oil consumption than API CK-4 standard
Technical Specifications
| Property | Value |
|---|---|
| Kinematic Viscosity @ 100°C, cSt | 15.7 |
| Kinematic Viscosity @ 40°C, cSt | 92.8 |
| Viscosity Index | 180 |
| HTHS Viscosity, cP | 4.2 |
| Pour Point | -48°C (-54°F) |
| NOACK Volatility, % weight loss | 10.9% |
| Total Base Number (TBN) | 10.1 |
| Sulfated Ash Content | 0.99% |
Industry Certifications & OEM Approvals
API
- CK-4/SN
Cummins
- CES 20086, CES 20081
Detroit Diesel
- DFS 93K222, 93K218
Volvo
- VDS-4.5
Mack
- EOS-4.5
Pros and Cons
Pros
- 6X more wear protection than required by DD13 Scuffing Test
- Highest viscosity index (180) in Max-Duty lineup
- Extreme cold-weather starting at -48°C (-54°F)
- Extended drain intervals up to 3X OEM recommendation
- 60% better turbo cleanliness protection
- 76% less oil consumption than API CK-4 standard
Cons
- Premium Investment: Higher initial cost compared to conventional or "shelf-brand" synthetic oils.
- Limited Local Retail: Primarily available through authorized dealers and specialized synthetic outlets. National Synthetics is a local stocking dealer. Call 1-678-944-8816 to confirm in-stock items for same-day local pickup.
Get AMSOIL Signature Series Max-Duty 0W-40 Synthetic Diesel Oil Today
Order directly through National Synthetics for Preferred Customer pricing and fast shipping.
SHOW MY PRICEIndependent AMSOIL Dealer #1858536
Shipping & Returns
Fast, Reliable Shipping
- Free standard ground shipping on orders of $100 ($130 in Canada) or more.
- Orders under the threshold ship for a flat $9.99 ($12.99 in Canada) freight charge.
- In-stock items typically delivered in two to three business days.
- U.S. and Canada only — no shipments to PO Boxes.
30-Day Return Policy
- Return unopened, currently marketed products within 30 days for a full refund (minus freight).
- Exchange unopened products within 90 days with no restocking fee.
- Special-order items are non-returnable.
- Returns are handled directly by AMSOIL.
Frequently Asked Questions
Choose 0W-40 when you need maximum cold-weather starting performance. With a pour point of -48°C vs -43°C for the 5W-40, it flows better in extreme cold. Both provide similar protection at operating temperature.
Customer Reviews
See all 1,508 reviewsSwitching oil
The total Base number is way too low for my liking since they changed the formulation. I am switching brands of oil.
Diesel oil
Best diesel oil on the planet!
Great Engine Protection
I’ve always been a “Royal Purple” guy, it’s a top of the line product as is their other products- BUT after running Amsoil 15W40 in my 2013 HD Silverado Duramax, it’s “Light Years”better for my MPG, engine oil temperature and power.
Only the BEST for Me
I have been using Amsoil since 1979 and I believe in putting the Best Oil in all my Toys . I use it in my cars,garden tractor , lawn mower , whole house generator , power washer , and my 2 Corvettes ,and in my 2013 Kioti CK35 HST Diesel tractor . I guess you could call me an Amsoil Junkie ??
Good oil
It’s great oil. Just did my last oil change and I think it will be the last. As it is already expensive and they increase the price , and made me pay for shipping. That was the last purchase.
Independent AMSOIL Dealer #1858536. Product information sourced from AMSOIL. Visit AMSOIL.com for the most current product details and availability.