For what it's worth---I know lubricating fluids have changed tremendously since the 60s but during my Automotive Certification, we were instructed that Motor Oil gets dirty (contaminated) but doesn't break down. Hydraulic fluid (auto trans fluid) breaks down and looses it's viscosity.
Back in the day, there was lots of recycled (cleaned) motor oil, but I never saw any recycled hydraulic fluids.
Like I said, this was back in the day, but I go by this previous training today.
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