Wholesale Ordering / Special Offers
Call 907-982-7115
Product/Account Links
AMSOIL Accounts
Products
Other Products
AMSOIL Heavy-Duty Synthetic Diesel Oil 10W-30
AMSOIL Heavy-Duty Synthetic Diesel Oil 10W-30
AMSOIL DOMINATOR 20W-50 Competition Diesel Oil
AMSOIL DOMINATOR 20W-50 Competition Diesel Oil
AMSOIL SAE 15W-40 Heavy-Duty Diesel and Marine Oil
AMSOIL SAE 15W-40 Heavy-Duty Diesel and Marine Oil
AMSOIL Series 3000 5W-30 Synthetic Heavy Duty Diesel Oil
AMSOIL Series 3000 5W-30 Synthetic Heavy Duty Diesel Oil
AMSOIL 10W-30/SAE 30 Synthetic Heavy-Duty Diesel Oil
AMSOIL 10W-30/SAE 30 Synthetic Heavy-Duty Diesel Oil
Save up to 25% on Amsoil Products

AMSOIL Signature Series Max-Duty Synthetic Diesel Oil 5W-40

AMSOIL Signature Series Max-Duty Synthetic Diesel Oil 5W-40
AMSOIL Signature Series Max-Duty Synthetic Diesel Oil 5W-40
Product Details
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.
Product Description
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*, delivering the security of providing your diesel the extra protection it deserves.

*Based on independent testing in the Detroit Diesel DD13 Scuffing Test for specification DFS 93K222 using a 5W-30 as worst-case representation.

Viscosity Control
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.

Excels in Extreme Temperatures
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.

Minimizes Oil Consumption
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.
Detroit Diesel DD13 Scuffing Test for Specification DFS 93K222
Oil Consumption Chart
APPLICATIONS
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
- Deutz DQC III-10LA
- Scania LA-2
- Chrysler MS 10902
- Ford WSS-M2C171-F1
Official Oil
COMPATIBILITY
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.

SERVICE LIFE
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.

Competition Service Life: Provides lasting protection for multiple events. Use oil analysis to determine appropriate drain interval.

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.

1Refer 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.
Product Size
Code Package Size Unit of Measure Product
DEOQT (DEOQT-EA) Quart Each Signature Series Max-Duty Synthetic Diesel Oil 5W-40
DEOQT (DEOQT-CA) Quart Case of 12 Signature Series Max-Duty Synthetic Diesel Oil 5W-40
DEO1G (DEO1G-EA) Gallon Each Signature Series Max-Duty Synthetic Diesel Oil 5W-40
DEO1G (DEO1G-CA)
Gallon
Case of 4 Signature Series Max-Duty Synthetic Diesel Oil 5W-40
DEOTP (DEOTP-EA)
2.5-Gallon
Each
Signature Series Max-Duty Synthetic Diesel Oil 5W-40
DEOTP (DEOTP-CA) 2.5-Gallon Case of 2 Signature Series Max-Duty Synthetic Diesel Oil 5W-40
DEO30 (DEO30-EA) 30-Gallon Drum Each Signature Series Max-Duty Synthetic Diesel Oil 5W-40
DEO55 (DEO55-EA) 55-Gallon Drum Each Signature Series Max-Duty Synthetic Diesel Oil 5W-40
DEO27 (DEO27-EA) 275-Gallon Tote Each Signature Series Max-Duty Synthetic Diesel Oil 5W-40
Technical Information
Extra Information
What is the difference between AMSOIL 5W-40 and 15W-40 diesel oil?
AMSOIL 5W-40 and 15W-40 diesel oils are multi-grade oils, meaning they provide good performance in high and low temperatures. AMSOIL Max-Duty Synthetic Diesel Oil 5W-40 and Signature Series Max-Duty Synthetic Diesel Oil 15W-40 both behave like SAE 40 oils in high temperatures; however, the 5W-40 is thinner than the 15W-40 at start-up and at cold temperatures.
Can I use AMSOIL CK-4 diesel oils in older diesel engines?
 Yes. CK-4 oils are backwards-compatible, meaning they can be used in older diesel engines. CK-4 oils are designed as direct replacements for prior-generation oils, including CJ-4 and CI-4+ oils.    
Can I switch from API CJ-4 or CI-4+ diesel oil to API CK-4 diesel oil?
Yes. CK-4 oils are backwards-compatible, meaning they can be used in older diesel engines. CK-4 oils are designed as direct replacements for prior-generation oils, including CJ-4 and CI-4+ oils.    
Bypass Filtration Systems
Phone Orders: (800) 956-5695 - M-F 9am-5pm Central Time - Customer Referral Number: 1702935
AMSOIL DEALER - Jari P Marjanen
Serving Customers Nationwide - Call 907-982-7115