Your reasoning is fair taking into consideration the Dex VI fluid was initially intended to supersede Dex III in all applications. Dexron-II(D) was composed of Group 2 base oil plus an additive package with alternative corrosion and rust inhibitors. This fluid is backward compatible with all previous Dexron fluids as well as the Type "A" suffix "A" and the Type "A" fluids produced from 1949 to 1966. A new fluid revision was needed for the proper operation of the new 2015 GM 8L90 and 8L45 8-Speed RWD/4WD automatic transmissions.

This was the first GM ATF to advertise 100,000 miles (160,000 km) between changes for "Normal Driving" conditions and 50,000 miles (80,000 km) for "Severe Service". Custom fabrication, engine rebuilds and knowledge that comes from experience and not Google, always available for a reasonable cost.This specification failed to address a number of issues concerning long-term durability, such as shear stability and fluid oxidation. In 2005, Ford released the Mercon Low Viscosity (LV) fluid and GM released the Dexron VI specification. ATF Universal fluids give high VI, low pour point, good corrosion and foaming resistance and are modified to create the particular dynamic frictional properties required.

Chevron Automatic Transmission Fluid MD-3 is a passenger car and light truck automatic transmission fluid for most pre-2006 automatic transmissions built by General Motors, Ford Motor Company and other makes requiring a high-performance, multi-purpose, power transmission fluid. All vehicle manufacturers made changes to their ATF specifications and the controls of their TCC to try to alleviate the problem.

Liquimatic Super ATF is an automatic transmission fluid blended from high quality mineral oil, synthetic base fluids and a balanced additive system.