Red Seal Automotive Service Technician Practice Exam

The primary function of transmission fluid is to lubricate and cool the transmission components. This is crucial because the transmission operates under high pressures and temperatures. The fluid reduces friction between moving parts, which prevents wear and damage, ensuring smooth and efficient operation of the transmission. Additionally, transmission fluid helps dissipate heat generated from the operation of these components, which is vital for maintaining optimal performance and prolonging the life of the transmission.

While transmission fluid may have some indirect effects on related systems or components, such as possibly affecting fuel economy through its efficiency in the powertrain, lubrication and cooling remain its essential and primary role in the overall functioning of the vehicle's transmission system.