AMSOIL Signature Series 5W-40 Max-Duty Synthetic Diesel OilA full synthetic 5W-40 diesel oil that meets the new API CK-4 diesel oil specification. Exceeds the phosphorus requirements for all model-year Ford Power Stroke diesel engines. This product replaces API CJ-4 “AMSOIL Premium 5W-40 Synthetic Diesel Oil”. Suitable for newer or older diesel engines

Synthetic Diesel Oil Package sizes include:
1-Quart Bottle (or buy case of 12)
1-Gallon Bottle (or buy case of 4)
2.5-Gallon Bottle (or buy in twin pack)
30-Gallon Drum, 55 Gallon Drum or 275-Gallon Tote

Oil Depot can offer AMSOIL Signature Series 5W-40 Max-Duty Synthetic Diesel Oil at wholesale prices in Canada or the United States. Request a wholesale price list using the contact form on this page. 

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

  • API CK-4/SN, CJ-4, CI-4+, CF
  • Ford WSS-M2C171-F1 (all model year Power Stroke engines)
  • Chrysler MS 10902 (Ram Cummins/EcoDiesel)
  • 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

Detroit Diesel DD13 Engine Scuffing Test PicturesFeatures and Benefits Of AMSOIL Signature Series 5W-40 Max-Duty Synthetic Diesel Oil

  • Wear control exceeds industry standard by 600%
  • Combats oil consumption
  • Overbuilt for long oil change intervals
  • Outstanding severe cold performance
  • Maintains viscosity in extreme heat and under heavy loads
  • Fights engine deposits

World-Class Wear Control

In the Detroit Diesel DD13 Engine Scuffing Test, Signature Series 5W-40 Max-Duty Synthetic Diesel Oil outperforms the minimum standard of this test by 600%. This result proves that Signature Series 5W-40 offers outstanding piston ring and cylinder bore wear resistance.

Stays in Grade, Reduces Oil Usage

The exceptionally low volatility makes Signature Series Diesel 5W-40 highly resistant to viscosity changes such as thickening. It also brings hard-nosed protection against “shear-down” when exposed to extreme heat and heavy loads. AMSOIL Signature Series Diesel Oil Consumption ChartThe result is consistent engine protection throughout the service interval.

Outstanding Year-Round Protection

This product boasts a cold-pour-point of -43°C for fast oil circulation during cold starts. Signature Series 5W-40 is also highly resistant to extreme heat, making it an outstanding year-round performer.

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

Diesel Engine Oil Life Recommendations

Turbo-Diesel Pick-up Trucks (except 2007-2010 models)– Two times the manufacturer’s oil change interval to a maximum of 40,000 km/25,000 miles or one year.
2007-2010 Dodge/Cummins 6.7L, Ford PowerStroke 6.4L, GM Duramax 6.6L– Must follow the manufacturer’s oil change interval. This is due to potential fuel dilution issues.
Heavy Duty Engines/Off-Road Equipment– Three times the manufacturer’s oil change interval to a maximum of 40,000 km/60,000 miles or 600 hours or one year (whichever comes first).
2007- 2009 Caterpillar C13 and C15 Highway Engines– Must follow the manufacturer’s oil change interval. This is due to potential fuel dilution.

Note: Do not extend oil change intervals when vehicle is operated in the following situations. Oil change intervals may be extended when supported with oil analysis.

  • Severe service applications (see vehicle owner’s manual for “severe service” definition).
  • When engine is heavily modified.
  • When 15% biodiesel (B15) is used.

Gasoline Engine Oil Life Recommendations

Up to two times the oil change interval as recommended by your owner’s manual to maximum of 15,000 miles (24,000 km) or one year, whichever comes first.

Note: When using gasoline with an ethanol content of greater than 10%, follow the manufacturer’s oil change interval or support with oil analysis.

Mixing AMSOIL Synthetic Diesel Engine Oil With Other Brands

AMSOIL Signature Series 5W-40 Max-Duty Synthetic Diesel Oil is compatible with all other brands of conventional, semi-synthetic and synthetic diesel engine oils. While you can safely mix AMSOIL Synthetic Diesel Oil with other brands, this will reduce the drain interval and performance capabilities of AMSOIL diesel oil.

The use of any aftermarket diesel engine oil additives is definitely not recommended.

Specifications of AMSOIL 5W-40 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 (DIN 51581) 250°C for 1 hour, % weight loss

9.2

Total Base Number

10.1

High Temperature/High Shear Viscosity, cP (ASTM D-6481)

4.3

Sulfated Ash Content, wt. %

0.99

AMSOIL Signature Series 5W-40 Max-Duty Synthetic Diesel Oil
A full synthetic API CK-4 diesel engine oil that also meets the Ford WSS-M2C171-F1 spec for all model year Power Stroke engines.
Brand: AMSOIL
Manufacturer: AMSOIL
Model: Signature Series 5W-40 Max-Duty Synthetic Diesel Oil
Product ID: DEO