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 - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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