[rohrmann]

There is another thing that will affect the hydraulic operation when it's cold, which is the weight of the fluid in the system. If you go on Lippert's site, and go to the Lip sheets, there is one that gives optional lighter weight fluids that can be used in colder climates, just like with some vehicles with motor oils. The Lip sheet is number 0291, LCI HYDRAULIC OPERATION FLUID RECOMMENDATION.