NIRO™ DTF HD SAE 10W is a transmission and hydraulic fluid. TOTACHI® NIRO™ DTF HD is specially designed for heavy-duty construction / specialized vehicles with mechanical or semi-mechanical transmissions continuously transferring power flow, including those equipped with wet brakes; for Allison, Caterpillar, Dana Powershift, Komatsu, Komatsu Dresser, Tremec/TTC, Vickers and ZF hydraulic systems requiring the fluids meeting Caterpillar TO-4 or Allison C-4 specifications.