Cold weather hydraulic oil

[2000intow]

I used to run snow dogg blue plow oil in my 2003 jerr-dan bed all year round because it performed good in subzero temperatures. Has anyone else tried this in newer equipment (or at all)? I bought my 2017 brand new and am about to do a hydraulic oil change in it for the first time since it was built and am contemplating making the switch? 

[dperone]

My pump would get louder the colder it got. I took it to a hydraulic shop and they suggested changing the fluid to ATF. It's been running ATF year round for a decade or so with no issues, and it doesn't get slow in the winter like our other trucks. 

[Bushwacker]

I also run ATF, I just buy 5 gallon buckets of cheap dex/merc ATF.

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[2000intow]

Thanks for both your guys' input!!