XR fork oil?

In my old 86 XR600 shop manual Honda says to use Automatic Transmission Fluid for the forks. Does anyone know the difference between ATF and other fork oils? Viscosity differences?

I used to ATF all the time back in the 70's & early 80's. Until about a year or two ago, I was using Mobil 1 synthetic ATF in my XR650R forks with pretty good results. It's about a ~10wt fluid if you dig into the specs.

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