This is genuine Toyota Automatic Transmission Fluid (ATF) World Standard (WS), an advanced, low-viscosity premium lubricant formulated specifically for modern Toyota, Lexus, and Scion electronic automatic transmissions. Engineered to reduce parasitic drivetrain drag, it optimizes fuel efficiency while providing thermal stability and shear resistance over extended service intervals.

The specialized chemical composition ensures smooth gear shifting, prevents transmission shudder, and delivers anti-wear protection for internal bearings, clutches, and planetary gear sets. It is a non-backwards-compatible fluid designed strictly for transmissions specified for "Type WS" fluid, and is typically distributed in sealed 4-liter or 1-liter industrial metallic cans to guarantee product purity and protect against moisture contamination.