Is Dextron IIIE transmission fluid part synthetic?

For most OTC Dexron III transmission fluids, they have conventional bases or blends of
conventional and synthetic bases. Some are even Group III bases now.

Dexron III is a great improvement over the older Dexron ATF spec as it has a wider temp range, better oxidative stability, and higher viscosity indices, such as 180-200. It is also a 0W20 spec.

MolaKule,

You are wise on ATF. I've seen Dexron III that was not synthetic blend.

Do you know why Mercon V is always a synthetic blend? I suspect it is for the flow properties at -40c, but am not sure.

Why is it better at preventing shudder?

Golly JJ, don't know for sure but full synths resist oxidation much better and Ford has one heck of a qualification test. Could be the synth's are only one that qualifies.

Many of the late spec'd ATF's also have certain additives for the internals that work with particular trnasmission.