Quote:

The first Fluid Drives that Chrysler made not only used motor oil but it used the same oil as the engine it was attached to, they shared the oil.

While the Fluid Drive wasn't an automatic, per se, it did have a torque converter and other features present in what we call an automatic.

As for switching from gear oil to ATF in a stick, that was done to ease shifting, NOT for durability.




And constant temperatures below 30*.

Manufacturers spend millions on R&D to make things work.Ever wonder why? Another example is power steering fluid.How many use ATF fluid in a power steering pump? It will work but if you want to see the difference,take two clean pumps,run one with each for a year and take them apart.You won't run ATF when you see the difference.