Castrol Syntrans 75W-85 is a full synthetic transmission fluid recommended for most commercial vehicle manual transmissions (truck, bus, light commercial vehicle) where API GL-4 lubricants are required.


  • Excellent thermal and oxidative stability maintains transmission cleanliness and lubricant performance allowing extended drain capability.
  • Synthetic formulation provides a reduction in operating temperatures giving longer component and lubricant life.
  • Superb cold flow characteristics give smoother gear shifts at low temperatures.
  • High shear stability maintains lubricant performance throughout the drain interval.
  • Good wear and EP performance ensures component protection under high load conditions reducing downtime and service costs.
Warranty and Protection Requirements
  • Exceeds all manufacturers’ warranty requirements for HD applications requiring a GL-4 full synthetic 75W-85 manual transmission fluid.

Product Data Sheet

Material Safety Data Sheet