It’s water or mineral oil mixed with other chemicals to improve certain properties(fe. mineral oil is used because it doesn’t boil as easily as water).
Idk what you mean by “mess with”, but typically hydraulic systems are under very high pressure. If the container breaks, that’s kind of a bomb. Typically they’re also quite hot and some are made from oil which might ignite when in contact with the rest of the machine(hot parts or electricity).
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