AMSOIL Signature Series Max-Duty 5W-30 Synthetic Diesel Oil
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Maximum-Duty Protection for 5W-30 Diesel Applications
AMSOIL Signature Series Max-Duty 5W-30 delivers 6X more wear protection than required by the Detroit Diesel DD13 Scuffing Test for Specification DFS 93K222. Purpose-built for modern turbodiesel pickups and heavy-duty diesel engines requiring 5W-30 viscosity.
Key Benefits
- 6X more wear protection than required by DD13 Scuffing Test
- 76% less oil consumption than API CK-4 standard
- 60% better turbo cleanliness protection
- 2X better rust protection
- Extended drain intervals up to 3X OEM recommendation
- Excellent cold-weather performance at -43°C (-45°F)
Technical Specifications
| Property | Value |
|---|---|
| Kinematic Viscosity @ 100°C, cSt | 12.0 |
| Kinematic Viscosity @ 40°C, cSt | 72.3 |
| Viscosity Index | 162 |
| HTHS Viscosity, cP | 3.5 |
| Pour Point | -43°C (-45°F) |
| NOACK Volatility, % weight loss | 8.6% |
| Total Base Number (TBN) | 10.1 |
| Sulfated Ash Content | 0.91% |
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
Ford
- WSS-M2C171-F1
Pros and Cons
Pros
- 6X more wear protection than required by DD13 Scuffing Test
- 76% less oil consumption than API CK-4 standard
- 60% better turbo cleanliness protection
- 2X better rust protection
- Extended drain intervals up to 3X OEM recommendation
- Excellent cold-weather performance at -43°C (-45°F)
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 5W-30 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
5W-30 diesel oil is used in many modern turbodiesel pickups including select Ford Power Stroke, GM Duramax, and Ram Cummins applications. Always check your owner's manual to confirm the correct viscosity.
Max-Duty allows extended drain intervals up to 3X OEM recommendation for heavy-duty applications (not to exceed 60,000 miles/600 hours/1 year) and 2X for turbodiesel pickups (not to exceed 25,000 miles/1 year). Use oil analysis to optimize intervals.
Customer Reviews
See all 1,508 reviewsAMSOIL Signature Series 5W-30 100% Synthetic Max-Duty Diesel
Best oil quality in market. HTHS is 3.5, minimum required by Ford. It is OK. Recommend everyone.
5 40 diesel oil / diesel additives for gas tank
I love amsoil oil products my truck runs smoother and quieter and the diesel additives i use all the time also better mileage performance and runs very cleans
MAX -DUTY
OIL SEEM TO BE WORKING FINE ONLY BEEN IN THE TRUCK FOR 200 MILES
I put nothing but Amsoil in my vehicles
I have been using Amsoil for many years I use nothing but Amsoil in my vehicles I have a Duramax diesel 6.6 2011 In my opinion Amsoil is the best synthetic oil on the market .
Best oil but pricy
Works great for my truck. One jug is one oil change. My mechanic highly recommended it.
Independent AMSOIL Dealer #1858536. Product information sourced from AMSOIL. Visit AMSOIL.com for the most current product details and availability.