Past Life Regression, but still a data point.
Was Commissioning Engineer of an MDF plant (Medium Density Fibreboard), and they were having problems with the pressure control on the conti press.
Was a super duper hydraulic system, 1,300 gal of oil, stored in a permanently pressurised system with a bladder with N2 on top to stop water in it, but some of the cylinders had been flooded in ocean transport.
I wanted a vacuum dehydration unit to correct it (like we do on power transformers), but the customer wanted an oil flush.
They ended up with 1,300 gal of wet oil in drums (had come out of the machine), and a still wet system.
So if you go multiple flushes, you will be throwing out oil until it's dry.
My recommendation...
* if there's a low point drain, first thing in the morning drain it (or all of them)...get the free water out.
* dessicant breathers...get a few, colour changing if you can, and dry the spares in the oven overnight
Rinse and repeat until the breathers stop changing colour.
Then change the oil.
Back to the MDF factory, they eventually let me get a fullers earth and vacuum unit in, then had a clean system...and 1,300 gal of "spare" oil in drums.