“Transjet TQ / ATF Steering Oil” (or similar ATF-TQ fluids) are used for, plus their benefits and cautions. I couldn't find a Transjet brand exactly, but TQ / ATF-TQ is a standard type of fluid — so this applies generally.
Transjet TQ/ATF is an Automatic Transmission Fluid used mainly for:
Power steering systems
Automatic transmissions
Hydraulic circuits requiring ATF type oil