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| Detergents in engine oil help flush plumbing valve blocks clean and keep them clean. Apparently some of the coolant used in machining is a chlorine based among other things and obviously that and any water could cause rust. Which leads to sticking valves.
At least that’s what I was told.
I run diesel engine oil in my 4730 hydro system. Cheapo 10W-30. Mainly because that’s all I could find on a Sunday afternoon when I blew a hydro line. | |
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Hydraulic oil on R4023 sprayer
