My skid-steer operator manual says to use 10W30 A.P.I. SE/CD or 20W50 A.P.I SE/CD oil for the hydraulic system (hydro-static motors/lift-tilt cylinders/auxiliary).
My question is: Can I use 15W40 A.P.I. CK-4, CJ-4, CI-4 Plus, CI-4, CH-4/SN oil as the hydraulic fluid?
During winter (NE KS) I can...