MAG 1® Conventional 20W-50 CH-4 Heavy Duty Diesel Engine Oil

Conventional Heavy Duty Diesel Engine Oil Heavy Duty Engine Oil

Featuring MAG 1® with FMX® Technology – Friction Management for Xtreme protection™. Delivers unsurpassed protection when thicker oil is preferred or recommended by the OEM.

MAG 1 Conventional 20W-50 CH-4 is technologically advanced heavy duty diesel engine oil that provides excellent protection and performance, including the following benefits:

  • Outstanding for older engines.
  • Recommended for use in a wide range of heavy-duty applications and operating environments found on and off highway, including engines operating under heavy loads.
  • Backward compatible with diesel engines in which the API CH-4, and earlier service categories are recommended. Select our CK-4 product to meet the latest API requirements.

Engineering and Innovation for Extra Protection

MAG 1® with FMX® Technology provides unsurpassed protection in every viscosity. 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. This is exactly the kind of protection called for in today’s engines that deliver greater horsepower and better fuel economy.    

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


  • FMX® Technology. Provides unsurpassed protection and performance.


  • Outstanding wear protection. FMX® Technology provides increased protection against harmful engine and bearing wear due to cavitation, because it is engineered to improve oil aeration.
  • Enhanced friction reduction. MAG 1 oils react to heat to produce a critical friction-reducing barrier to protect metal surfaces.       


  • Better oxidation and deposit control. Diesel engines work at higher operating temperatures and the need greater protection.
  • Formulated to retain viscosity. Provides oxidation control and protection against acid buildup that can cause rust and corrosion.


  • An engine oil recommended for naturally aspirated and turbocharged four-stroke diesel engines in which the older API CH-4 service category is recommended. 

Industry/OEM Specifications

API CF-4/SG Meets Requirements
API CH-4 Meets Requirements

Typical Properties

Calcium, wt. % ASTM D5185 0.966
Cold Cranking Simulator at (°C), cP ASTM D5293 3282 (-15)
Color ASTM D1500 2
Gravity, °API ASTM D287 30.27
High Temperature / High Shear Vis at 150°C, cP ASTM D5481 4.7
Magnesium, wt. % ASTM D5185 0.0914
Nitrogen, wt. % ASTM D4629 0.061
Phosphorus, wt. % ASTM D5185 0.0914
Specific Gravity @ 60°F (15.6°C) ASTM D4052 0.8747
Sulfated Ash, wt. % ASTM D874 1.03
Sulfur, wt. % ASTM D4951 0.231
TBN, mgKOH/g ASTM D2896 7.5
Viscosity @ 100°C cSt ASTM D445 18.2
Viscosity @ 40°C cSt ASTM D445 141.7
Viscosity Index ASTM D2270 144
Zinc, wt. % ASTM D5185 0.1

Container/Bulk Availability

3/1 Gallon Product Number - 60252
5 Gallon Pail Product Number - 60276
5 Gallon Pail - Not for sale in US Product Number - 64133
55 Gallon Drum - Not for sale in US Product Number - 64134
Available in Bulk