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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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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