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Reply to "Which Hydraulic Oil ?"

DEO? Are we talking about Caterpillar? If so, which info do you need?

It really depends what type of system you are going to use the oil in. If it's just a hydraulic system, the fluid only needs to be:
- clean enough for economic filter life
- non-compressable, no foaming
- right viscosity
In this case, the hydraulic oil only serves as a medium. Therefor you see so many differentiations, one OEM uses engine oil, the other a straight hydraulic oil, another ATF, etc.

@Michael: Can you give an example of a typical UTTO/STOU characteristic which may be required for a regular hydraulic system?
Last edited by em
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