Transmax Dex VI - Automatic Transmission Fluid. Castrol Transmax Dex VI is approved for use in all General Motors automatic transmissions. It is licensed against Dexron® VI which supersedes all previous Dexron® specifications for General Motors Holden applications.


  • Low viscosity formulation provides fuel economy benefits compared with fluids formulated to meet Dexron® IIIH or earlier specifications.
  • Premium synthetic formulation gives outstanding oxidative resistance extending transmission life.
  • Enhanced friction durability improves shifting performance.
  • Dexron VI