Mobil 424 is a good product in my experience. It's a UTTO (Universal Tractor Transmission Oil). The relatively high water tolerance stems from the use of totally different chemistry typically used in either ATFs or traditional gear oils. You might note that there is a Low Temperature version if you can find it. I can honestly say that you should not have a problem with this fluid.
My definition of an expert in any field is a person who knows enough about what's really going on to be scared.
~ PJ Plauger