What is the difference between automatic and manual transmission fluid?

Automatic and manual transmission fluids serve distinct purposes based on the type of transmission system. Automatic transmission fluid (ATF) is formulated to function in automatic gear systems, providing lubrication, cooling, and hydraulic pressure to facilitate smooth gear shifts. It contains special additives for oxidation resistance, friction modification, and temperature stability. In contrast, manual transmission fluid (MTF) is designed for manual gearboxes, primarily focusing on lubricating gears and bearings to minimize wear and tear. MTF is often thicker than ATF, as manual transmissions do not require the same hydraulic properties but instead depend on robust lubrication for direct gear engagement. Choosing the right fluid is essential for optimal transmission performance and longevity.