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Synthetic Blend Heavy Duty Diesel Engine Oil

Heavy Duty Engine Oil

Our complete family of Synthetic Blend Heavy Duty Diesel Engine Oils provide extra protection and performance, compared to Conventional Engine Oil.

Protection for Today’s Engine Designs

As today’s engines are evolving and heavy duty engine manufacturers are recommending thinner, lighter oils, MAG 1® has evolved right along with them. Only the most advanced engine oils meet the difficult challenges of effectively balancing durability, extending drain intervals and protecting emissions control devices.

Unsurpassed Protection, Even in the Lightest Viscosity

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, in spite of severe engine temperatures. MAG 1 also delivers greater horsepower and improved fuel economy. 

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

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

Performance

Outstanding protection for extended drain intervals.

Up to 1.6% improved fuel mileage with HD 10W-30 grade.¹ 

Strength

Up to 53% better wear protection.  

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Durability

Up to 83% better oxidation control.² 

Up to 63% better deposit control.²

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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.

Typical Properties

Viscosity Grade Syn Blend 15W-40 CK-4 Syn Blend 10W-30 CK-4
Calcium, wt. % ASTM D5185 0.105 0.105
Cold Cranking Simulator at (°C), cP ASTM D5293 5398 (-20) 6270 (-25)
Color ASTM D1500 3 2.5
Flash Point °C ASTM D92 224 220
Flash Point °F ASTM D92 435 428
Gravity, °API ASTM D287 30.55 31.39
High Temperature / High Shear Vis at 150°C, cP ASTM D5481 4.3 3.5
Magnesium, wt. % ASTM D5185 0.1 0.1
Molybdenum, wt. % ASTM D5185 0.0066 0.0066
Nitrogen, wt. % ASTM D4629 0.105 0.105
Noack Volatility, % loss ASTM D6375 10 13
Phosphorus, wt. % ASTM D5185 0.115 0.115
Pour Point °C (°F) ASTM D5950 -36°C (-33°F) -39°C (-38°F)
Pumping Viscosity at (°C), cP ASTM D4684 21,600 (-25) 23,000 (-30)
Specific Gravity @ 60°F (15.6°C) ASTM D4052 0.8732 0.8687
Sulfated Ash, wt. % ASTM D874 0.99 0.99
Sulfur, wt. % ASTM D4951 0.32 0.32
TBN, mgKOH/g ASTM D2896 10.0 10
Viscosity @ 100°C cSt ASTM D445 15.66 12.21
Viscosity @ 40°C cSt ASTM D445 116.1 82.06
Viscosity Index ASTM D2270 143 149
Zinc, wt. % ASTM D5185 0.127 0.127

Industry/OEM Approvals

Title Syn Blend 15W-40 CK-4 Syn Blend 10W-30 CK-4
ACEA E9, E7, E4, E2 Meets Requirements Meets Requirements
Allison C-4 Suitable for Use Suitable for Use
API CI-4 Plus, CI-4, CH-4, CG-4, CF-2, CF Meets Requirements Meets Requirements
API CJ-4 Meets Requirements Meets Requirements
API CK-4 Approved Approved
API SJ, SH, SG, SF Meets Requirements -
API SL Meets Requirements -
API SM Meets Requirements -
API SN Approved -
CAT ECF-3, ECF-2, ECF-1-a Meets Requirements Meets Requirements
Chrysler/Fiat MS-10902 Meets Requirements -
CID A-A-52306, MIL-PRF-2104G Meets Requirements Meets Requirements
Cummins 20086 Meets Requirements Meets Requirements
Cummins CES 20081, 20077, 20076 Meets Requirements Meets Requirements
Detroit Diesel 93K218, 93K215, 93K214 Meets Requirements Meets Requirements
Detroit Diesel 93K222 Meets Requirements Meets Requirements
Ford WSS-M2C171-E Meets Requirements Meets Requirements
Ford WSS-M2C171-F1 Approved Approved
Global DHD-1 Meets Requirements Meets Requirements
JASO DH-2 Meets Requirements Meets Requirements
Mack EO-O Premium Plus, EO-N Premium Plus 03, EO-M Plus, and prior Meets Requirements Meets Requirements
Mack EOS-4.5 Meets Requirements Meets Requirements
MAN 3275, 270 Meets Requirements Meets Requirements
MAN 3575 Meets Requirements Meets Requirements
MB 228.3, 228.31 Meets Requirements Meets Requirements
MTU 2.1 Meets Requirements Meets Requirements
MTU Type I, Type II Meets Requirements Meets Requirements
Renault RLD-4 Meets Requirements Meets Requirements
Volvo VDS-4, 3, 2 Meets Requirements Meets Requirements
Volvo VDS-4.5 Meets Requirements Meets Requirements
CAT TO-2 - Suitable for use

Information accurate as of November 11, 2025