Conventional Heavy Duty Diesel Engine Oil

Heavy Duty Engine Oil

Our conventional heavy duty diesel engine oils are for older engine and OEM specifications, but still improve performance, extend engine life and resist thermal breakdown.

Protection You Can Count On

MAG 1® engine oil provides outstanding technology for our heavier viscosities. These engine oils meet the difficult challenges of effectively balancing durability, extending drain intervals and protecting emissions control devices in modern and older engines.

Unsurpassed 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, in spite of severe engine temperatures and operating conditions.

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


FMX® Technology provides unsurpassed protection and performance.


Outstanding wear protection. 

Enhanced friction reduction.  


Excellent oxidation and deposit control. 

Formulated to retain viscosity with high TBN of 12.

Typical Properties

Viscosity Grade Conv 20W-50 CH-4 Conv 25W-60 CF-4
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 -

Industry/OEM Approvals

Title Conv 20W-50 CH-4 Conv 25W-60 CF-4
API CF-4/SG Meets Requirements -
API CH-4 Meets Requirements -