We recently completed two units for use in Siberia; here are some of the items we installed for this project I hope it helps. I would recommend heater blankets for the hydraulic tank; fuel tank and batteries. We also rehosed the unit with Parker freezer application hydraulic hose and hydraulic fluid. I agree with the engine block heaters but would like to add a heater for the diff. and/or final drives if applicable. I would not use a higher concentration of antifreeze, your cooling protection drops the more concentrated the mixture is, just follow the mfg. instructions for proper mix. I,m not sure if it helped or not but the customer requested gel cell type batteries also; Dave.