Which fluid is responsible for transferring power in an automatic transmission?

The fluid responsible for transferring power in an automatic transmission is transmission fluid. This specialized fluid plays a crucial role in lubricating the moving parts within the transmission, enabling the hydraulic system to function efficiently. When the engine generates power, transmission fluid transmits this power to the transmission components, allowing for smooth gear shifts and proper operation of the vehicle. The fluid properties ensure that it can handle the heat generated by the transmission and maintain consistent performance under various driving conditions.

Brake fluid, while also hydraulic, is specifically designed for the braking system and cannot handle the demands of power transfer in a transmission. Power steering fluid is utilized in the steering system to assist with steering, and engine oil lubricates the engine's moving parts, neither of which are suitable for the automatic transmission's power transfer requirements. Thus, transmission fluid is uniquely formulated to fulfill the essential role of power transfer in an automatic transmission, making it the correct choice.