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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 Heavy Duty Diesel Engine Oil is designed to provide the highest levels of protection and performance from our most advanced technology and formulations.

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.

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

MAG 1® Full Synthetic Heavy Duty Diesel Engine Oil is specially engineered and formulated to provide:


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


  • Up to 53% better wear protection.    

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  • 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.

 Compared to new limits of API CK-4 requirements. 

Full Synthetic Heavy Duty Diesel Engine Oil

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

For superior fuel economy, wear protection and piston deposit control.

Product Details