In the fluid coupling used in cold region open what oil should be used, pay attention to what issues?

In the fluid coupling used in cold region open what oil should be used, pay attention to what issues?

In the Northern Alpine region pumping or ski on the tractor with hydraulic Coupler, most of them are used in the open air, requires in-40 ℃ environment can still operate properly. General L-TSA32 of turbine oil point only up to-7 c, 6th points of hydraulic transmission fluid-30 ℃, the 8th hydraulic transmission oil pour point of-35 ℃. cannot be used in Alpine regions. 8D size in only 0/SYRH2042-2001 hydraulic transmission oil pour point of-50 c, which you can use in Alpine areas open.