RE:RE:RE:RE:RE:RE:RE:RE:RE:Rain rain rainFreezing hydraulics is tough to believe alone...especially in the world of synthethic trans/hydraulic fluid. The oil patch has been a part of my life for the past 35 years and in the old days; we allowed machinery to run for a while prior to putting a load on the hydraulic system. Running cold hydraulic oil pressures up the system; but once it shears out through the hydraulic pump relief a few times...there's enough heat in the fluid system to run your hydraulics in the coldest of weather.