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MAG 1® Full Synthetic 5W-40 CK-4 Heavy Duty Diesel Engine Oil

Full Synthetic Heavy Duty Diesel Engine Oil Heavy Duty Engine Oil

Featuring MAG 1® with FMX® Technology – Friction Management for Xtreme protection. Provides unsurpassed protection, even in our lightest viscosities. Protects better than the thick oils of the past.

MAG 1 Full Synthetic 5W-40 is technologically advanced heavy duty diesel engine oil that provides unsurpassed protection and performance, including the following benefits:

  • Our best cold temperature performance.
  • Superior extended drain capability.
  • Meets or exceeds the requirements of OEMs.

Engineering and Innovation for Extra Protection

MAG 1® with FMX® Technology provides unsurpassed protection in every viscosity. Even our lowest viscosity oils protect better than thick oils of the past. FMX Technology creates a strong, durable and high-performing level of protection that controls friction and reduces metal-to-metal contact. 

Our advanced oil technology actually improves oil properties over time, retaining viscosity, friction and anti-wear benefits, even in today’s hotter engines, reducing the need for thicker oil. This is exactly the kind of protection called for in today’s engines that deliver greater horsepower and better fuel economy.

Full Synthetic Heavy Duty Diesel Engine Oil featuring FMX® Technology and Evolutionary Performance™

The latest MAG 1® Full Synthetic Heavy Duty Diesel Engine Oils are specially engineered and formulated to provide:    


Unsurpassed protection for extended drain intervals. 
Up to 1.6% improved fuel mileage.1

  • Improved fuel economy. Reduces fuel costs without sacrificing engine protection and performance.
  • Extended oil drain intervals. Fuel economies can be gained when following engine manufacturer recommendations and in conjunction with scheduled oil analysis.


Up to 53% better wear protection.2   

  • Enhanced friction reduction. MAG 1® provides a very strong oil film to prevent metal-to-metal contact between rotating parts, delivering up to 53% better wear protection.³ 
  • Unsurpassed wear protection. The latest generation API CK-4 MAG 1 engine oils provide increased protection against harmful engine and bearing wear due to cavitation, because they improve oil aeration.


Up to 83% better oxidation control.2

Up to 63% better deposit control.2

  • Better oxidation and deposit control. FMX® Technology stands up to high heat and stress to protect as well on the last day as it does on the first day. Up to 83% better oxidation control and 63% better deposit control.⁴ 
  • Formulated with higher starting TBN (10). Provides added oxidation control and protection against acid buildup that can cause rust and corrosion.

¹ Using HD 10W-30 CK-4, compared to Conventional HD 15W-40 CK-4 during on-highway long-haul service. Savings will vary on idle time and other driving conditions of your fleet or vehicle.

² Compared to new limits of API CK-4 requirements.

³ To measure friction reduction benefits, engineers used the ball-on-disk traction test.

⁴ Compared to new limits of API CK-4 requirements.


  • This product and grade is a fuel economy and mixed fleet engine oil recommended for naturally aspirated and turbocharged four-stroke diesel engines in which the API CK-4 service categories are recommended. It is formulated for engines operating under severe service and a wide range of cold and hot temperatures.
  • It is backward compatible for CJ-4 and older API service categories.
  • Approved by or meets requirements of major OEMs such as Cummins, Detroit Diesel, Mack/Volvo, Paccar, Navistar, Caterpillar, and others.

Industry/OEM Specifications

API CK-4 Approved
API SN Approved
Ford WSS-M2C171-F1 Approved
ACEA E9, E7, E4, E2 Meets Requirements
API CI-4 Plus, CI-4, CH-4, CG-4, CF-2, CF Meets Requirements
API CJ-4 Meets Requirements
API SJ, SH, SG, SF Meets Requirements
API SL Meets Requirements
API SM Meets Requirements
CAT ECF-3, ECF-2, ECF-1-a Meets Requirements
Chrysler/Fiat MS-10902 Meets Requirements
CID A-A-52306, MIL-PRF-2104G Meets Requirements
Cummins 20086 Meets Requirements
Cummins CES 20081, 20077, 20076 Meets Requirements
Detroit Diesel 93K218, 93K215, 93K214 Meets Requirements
Detroit Diesel 93K222 Meets Requirements
Ford WSS-M2C171-E Meets Requirements
Global DHD-1 Meets Requirements
JASO DH-2 Meets Requirements
Mack EO-O Premium Plus, EO-N Premium Plus 03, EO-M Plus, and prior Meets Requirements
Mack EOS-4.5 Meets Requirements
MAN 3275, 270 Meets Requirements
MAN 3575 Meets Requirements
MB 228.3, 228.31 Meets Requirements
MTU 2.1 Meets Requirements
MTU Type I, Type II Meets Requirements
Renault RLD-4 Meets Requirements
Volvo VDS-4, 3, 2 Meets Requirements
Volvo VDS-4.5 Meets Requirements
Allison C-4 Suitable for Use

Typical Properties

Calcium, wt. % ASTM D5185 0.082
Cold Cranking Simulator at (°C), cP ASTM D5293 6535 (-30)
Color ASTM D1500 2.5
Flash Point °C ASTM D92 225
Flash Point °F ASTM D92 437
Gravity, °API ASTM D287 33.57
High Temperature / High Shear Vis at 150°C, cP ASTM D5481 3.5
Magnesium, wt. % ASTM D5185 0.116
Molybdenum, wt. % ASTM D5185 0.007
Nitrogen, wt. % ASTM D4629 0.124
Noack Volatility, % loss ASTM D6375 12
Phosphorus, wt. % ASTM D5185 0.115
Pour Point °C (°F) ASTM D5950 -45°C (-49°F)
Pumping Viscosity at (°C), cP ASTM D4684 24,113 (-35)
Specific Gravity @ 60°F (15.6°C) ASTM D4052 0.8572
Sulfated Ash, wt. % ASTM D874 0.99
Sulfur, wt. % ASTM D4951 0.314
TBN, mgKOH/g ASTM D2896 10
Viscosity @ 100°C cSt ASTM D445 14.76
Viscosity @ 40°C cSt ASTM D445 87.75
Viscosity Index ASTM D2270 177
Zinc, wt. % ASTM D5185 0.127

Container/Bulk Availability

6/1 Quart Product Number - 70175
3/1 Gallon Product Number - 62627
6 Gallon Enviro Box® Product Number - 70203
55 Gallon Drum Product Number - 68037
330 Gallon Tote Product Number - 68035
Available in Bulk