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Reply to "Hydraulic Oil vs. Motor Oil"

Several differences between bespoke hydraulic oils and engine oils(monogrades)
Antiwear performance in engine oils is better due to higher levels of ZDDP. Engine oils are pro emmulsion wheras hydraulic oils are better at shedding water.
Monograde engine oils SAE 10W are readily available usually in appropriate specs which include CAT TO2 and Allison C3 and have hydraulic performance tests.
Oils with CAT TO4 , Allison C4 are usually much more expensive and have no benefits in hydraulic systems over CAT TO2 products.
See no reason why ISO 46 hydraulic oil can not be used with some good antiwear credentials like Eaton Vickers M-2950-S(Mobile) similarly SAE 10W with CAT TO2 etc. Suggest you do not use SA 10W type product which does not contain any antiwear additive.If this is the current product in use would go to non detergent ISO 46 hydraulic oil as above immediately.
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