He did some work, developed Water Wetter simply as a corrosion inhibitor, and gave it to Huffaker. Huffaker immediately noticed lower operating temperatures, and Roy started to investigate why. Ford originally did not want slip in clutch plates. Cf than Type F Now Mercon and Dexron II are almost identical. Gear Oil Gear oil viscosity is measured at 150 F vs. 210 F for motor oil.
Gear oil is acidic, motor oil is alkiline.
Therefore, it has a very high sulfer and phospor content. Sulfur and Phosphate reactions start at a lower temperature, and Gear Oil has much more additive than motor oil. This additive is corrosive to copper bearings and bronze synchro rings. Positraction additives are Friction modifiers - make the base oil much more slippery. Friction Modifiers may detract from EP characteristics.