Why ATF evolved: friction, cooling, and multi‑vehicle use

Automatic transmission fluid emerged as a specialized lubricant when hydraulic automatics spread in the mid‑20th century, blending base oils with friction modifiers to balance smooth shifts and clutch grip. Modern ATFs also handle cooling, corrosion control, and seal conditioning. Choosing a multi‑vehicle fluid can simplify service across mixed fleets; Multi Vehicle ATF (TYPE T-IV) reflects that versatility.