Posted June 13, 2018 - 10:43 AM
Since you won't get it all out unless you completely disassemble the unit, or change the fluid and filter several times back to back with just enough use in between to stir everything up and mix it all together inside before draining, maybe one of these synthetic blends might be a good compromise?
I wouldn't use synthetic oil in just everything but I do see advantages in some applications. This being a hydraulic application where fluid is being pumped around, not sure about but in a splash lube application I have seen it make a difference. I had a 4x4 plow truck some years back and the front axle disconnect mechanism wouldn't always engage properly when it was cold outside, I switched to a synthetic axle lube and never had another problem. I have heard that you shouldn't switch from conventional to synthetic on an older unit because of possibly new leakage developing because the existing seals are conditioned to that style of lube. On my truck I had recently had the front diff apart and put new seals into it throughout and had run the conventional stuff for a short time before I switched