Protect your investment in diesel power and confidently extend drain intervals with our top-grade synthetic diesel oil. AMSOIL Signature Series Max-Duty Synthetic Diesel Oil delivers 6X better wear protection than required by the Detroit Diesel DD13 Scuffing Test for Specification DFS 93K222. Advanced synthetic technology provides excellent viscosity control and outstanding extreme-temperature performance, while minimizing oil consumption. The result: protection that's boosted to the max.
Package sizes include:
Quart Bottles
Gallon Bottles
2.5-Gallon Bottles
30-Gallon Drum
55-Gallon Drum
275-Gallon Tote
Use in diesel engines and, where appropriate, gasoline engines requiring any of the following specifications:
• API CK-4/SN, CJ-4, CI-4+, CF
• Volvo VDS4.5, VDS4, VDS3
• Mack EOS-4.5, EO-O
• Renault RLD-4, RLD-3
• Cummins CES20086, CES20081
• Caterpillar ECF-2, ECF-3, ECF-1-a
• DDC 93K218, 93K215, 93K214
• DFS 93K222
• ACEA E9, E7
• MB 228.31
• MAN 3575
• MTU Type 2.1, II, I
• JASO DH-2
• Allison TES439
• Deutz DQC III-10LA
• Scania LA-2
• Chrysler MS 10902
• Ford WSS-M2C171-F1
Maximum Engine Protection: Wear on rings and cylinder liners leads to increased oil consumption and loss of compression, resulting in reduced horsepower and fuel economy. Independent testing shows AMSOIL Signature Series Max-Duty delivers 6X more wear protection than required by the Detroit Diesel DD13 Scuffing Test for Specification DFS 93K222, delivering the security of providing your diesel the extra protection it deserves.
Using top-tier synthetic base oils, AMSOIL Signature Series Max-Duty is naturally resistant to oxidation and the thickening effects of soot contamination. That, along with boosted detergent/dispersant additives, keeps soot particles suspended independently, helping prevent the formation of larger, wear-causing particles. Viscosity increase is minimized and soot-related wear is controlled. Lower volatility also helps Signature Series Max-Duty retain its viscosity after high-temperature service for maximum engine protection and efficiency.
AMSOIL Signature Series Max-Duty Synthetic Diesel Oil resists thermal (heat) breakdown better than conventional and competing synthetic diesel oils. Unlike conventional oils, Signature Series contains no wax, staying fluid in sub-zero temperatures for easier starting, improved oil flow and reduced wear. Signature Series 0W-40 (DZF) has a broad viscosity range that offers 4X better cold-cranking ability than a 15W-40, making it excellent for use in both hot-operating engines and cold-weather starting extremes.
AMSOIL Signature Series Max-Duty has a low rate of volatility (burn-off), reducing oil consumption during operation and passing less oil vapor into the combustion chamber. It provides up to 76 percent less oil consumption than required by the API CK-4 standard in the Caterpillar-1N oil consumption test.
AMSOIL Signature Series Max-Duty Synthetic Diesel Oil is compatible with other conventional and synthetic engine oils. Mixing AMSOIL diesel oils with other oils, however, will shorten the oil's life expectancy and reduce the performance benefits. AMSOIL does not support
extended drain intervals where oils have been mixed.
Aftermarket oil additives are not recommended for use with AMSOIL synthetic diesel oils.
Diesel Engine Service Life
Heavy-Duty On-/Off-Road: Three times (3X) OEM1 recommendation, not to exceed 60,000 miles/600 hours or one year, whichever comes first.
Turbodiesel Pickup: Two times (2X) OEM1 recommendation, not to exceed 25,000 miles or one year, whichever comes first.
Gasoline Engine Service Life
Two times (2X) OEM1 recommendation, not to exceed 15,000 miles or one year, whichever comes first.
Drain intervals may be extended further with oil analysis.
Refer to your owner's manual for OEM drain interval recommendations and guidelines for severe and normal service.
Note: Extended drain intervals are not recommended for performance-modified engines, when using biofuels containing more than 10 percent ethanol or 15 percent biodiesel (B15) or for 2007-2009 Caterpillar* C13 and C15 on-highway engines. Extend drain intervals beyond OEM recommendations in these instances only with oil analysis. Note: 2007-2010 Dodge**, Ford** and GM** turbodiesel pickups are also not recommended for extended drain intervals when using DHD.
This product is not expected to cause health concerns when used for the intended application and according to the recommendations in the Material Safety Data Sheet (MSDS).
Click here to view the MSDS Data Sheet for AMSOIL DEO.
Keep out of the reach of children. Don't pollute. Return used oil to collection centers.
| TYPICAL TECHNICAL PROPERTIES | |
| AMSOIL Signature Series Max-Duty Synthetic Diesel Oil (DEO) | |
| Kinematic Viscosity @ 100°C, cSt (ASTM D-445) | 15.4 |
| Kinematic Viscosity @ 40°C, cSt (ASTM D-445) | 94.5 |
| Viscosity Index (ASTM D-2270) | 173 |
| CCS Viscosity @ -30°C, cP (ASTM D-5293) | 5555 |
| Pour Point °C (°F) (ASTM D-97) | -43 (-45) |
| NOACK Volatility, % weight loss (g/100g) (ASTM D5800) | 9.2 |
| Total Base Number (ASTM D2896) | 10.1 |
| High-Temperature/High-Shear Viscosity, cP (ASTM D5481) | 4.3 |
| Sulfated Ash Content, wt. % | 0.99 |
Product Name: Premium Diesel Oils (DEO,DME)
Current Rating: 4.87out of 5 stars
Votes & Reviews: 204 vote(s) and 332 user reviews.
Reviewed by Richard: 
Use on my stock 2012 duramax with over 100,000 miles. No issues with dpf or other emission systems. With oil analysis, it holds up great for around 15,000 miles.
Reviewed by Tim:
Seems to be good. Use it in my new John Deere X750 garden tractor.
Reviewed by Joseph:
Time will tell. Engine temperature down by 25 to 30 degrees
Reviewed by Dennis:
The Amsoil products ive purchased are all excellent quality..super fast shipping. I have been using many of your products for years. The oil also made the small engine noise the newer diesels have even quieter. Thank you Amsoil!!
Reviewed by Mark:
I ran this in my jeep there's a 3 L Italian motor and I have never had any problems.
Reviewed by Michael:
I travel a lot fishing bass tournaments all over the country pulling a 21 foot bass boat and I immediately noticed a difference when I started using Amsoil in my Ram 2500 diesel. Engine runs quieter and smoother. Can't say enough good things about Amsoil products.
Reviewed by Matt:
I watch my oils pretty close when buying brands. Amsoil Max Duty has the highest rating in wear tests. Seeing as how I plan to keep my truck for many years, this is my oil of choice.
Reviewed by Jeff:
Wouldn't put anything else in my engine!
Reviewed by Nick:
I love your product
Canada
United States
Great Diesel Oil
This oil is the finest quality I have ever run into. That is why it is in all our Diesel trucks.