Generally hydraulic oils have more anti-foaming agents, possibly different or more anti-wear agents, which can be a benefit for most hydraulic systems. Also a few like Hytran can keep a relatively large amount of water in suspension, thereby insuring the pump/valve has at least some oil lubrication rather than occasionally ingesting only water. The motor oil detergents are not a benefit, nor are the additives which neutralize the combustion by-products. Personally I substitute Low-Vis Hy-Gard for SAE 10W hydraulic oil, and as you already do, use standard Hy-Gard for situations requiring a heavier hyd oil. But in a low pressure, lower flow system, most any oil will work satisfactory.
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Today's Featured Article - Fire in the Field A hay fire is no laughing matter-well, maybe one was! And a good life-lesson, too. Following World War II many farm boys returned home both older and wiser. One such man was my employer the summer I was sixteen. He was a farmer by birth and a farmer by choice, and like many returning soldiers, he was our silent hero: without medals or decorations, but with a certain ability to survive. It was on his farm that I learned to use the combination hand clutch and brake on a John D
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