Torque-Drive® Synthetic Automatic Transmission Fluid Engineered to eliminate deficiencies common to conventional petroleum ATFs, AMSOIL Torque-Drive provides superior performance and protection against thermal and oxidative degradation, sludge and varnish formation, viscosity shear down, cold-temperature oil thickening, poor friction stability, high component wear and shortened oil life. Engineered for outstanding performance in heavy-duty transmissions manufactured by Allison, Voith, ZF and other heavy-duty transmissions. Excellent protection in temperature extremes. Ensures consistent, smooth clutch engagement over the life of the fluid and controls clutch glazing and elongated shift times.