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MAG 1® Full Synthetic HD 50 Transmission Fluid

Heavy Duty Truck Transmission Fluid Automatic Transmission Products

MAG 1 Full Synthetic Heavy Duty 50 Transmission Fluid is formulated for use in manual transmissions that undergo severe duty and extended drain intervals. It is formulated with full synthetic base stocks and advanced additives to provide outstanding cold temperature performance and protect against corrosion, oxidation and deposits. Full Synthetic Heavy Duty SAE 50 Transmission Fluid is suitable for use in applications calling for MT-1, Navistar/International TMS 6816, Mack TO-A Plus, Volvo I-Shift, Meritor O-81 and ZF Freedomline as well as other extended drain heavy duty transmissions.

Evolutionary Performance™

Heavy duty truck transmissions have evolved dramatically, requiring highly specialized fluids for unique applications. One brand has evolved right alongside – MAG 1®. Only the most advanced transmission fluids meet the difficult challenges of effectively balancing performance, strength and durability.

Featuring MAG 1® with FMX® Technology - Friction Management for Xtreme protection™. FMX technology provides unsurpassed protection and performance.


  • Delivers superior friction stability to maintain smooth, consistent shifting and reduce shudder.


  • Provides a strong fluid film to prevent metal-to-metal contact between rotating parts to prevent wear.


  • Resists thickening due to high operating temperatures.    


  • Heavy-duty manual transmissions where extended service intervals are required.
  • On-highway, commercial light and heavy duty trucking, buses and vans.
  • Off-highway industries including construction, mining and agriculture.
  • NOT suitable for hypoid gear applications in differentials and final drives, either for topping off or refills, where API service GL-5 or MIL-PRF-2105E lubricants are specified.

Industry/OEM Specifications

API GL-1 and MT-1 Suitable for Use
Mack TO-A Plus Suitable for Use
Meritor O-81 Suitable for Use
Navistar/International TMS 6816 Suitable for Use
Volvo I-Shift Suitable for Use
ZF Freedomline Suitable for Use

Typical Properties

Brookfield Viscosity at -40°C, cP ASTM D2983 124,000
Color ASTM D1500 1.5
Flash Point °C ASTM D92 218
Flash Point °F ASTM D92 424
Gravity, °API ASTM D287 30.12
Pour Point °C (°F) ASTM D5950 -51°C (-60°F)
Specific Gravity @ 60°F (15.6°C) ASTM D4052 0.8755
Viscosity @ 100°C cSt ASTM D445 18.01
Viscosity @ 40°C cSt ASTM D445 122.2
Viscosity Index ASTM D2270 164

Container/Bulk Availability

330 Gallon Tote Product Number - 68246
55 Gallon Drum Product Number - 67046
16 Gallon Keg Product Number - 67048
5 Gallon Pail Product Number - 63598
Available in Bulk