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Reply to "Hydraulic oil blackening"

The blackening of oil is due to coke formation
of oil.Usually inadequate stability of base oil
(Group I)results in dark color of oil.

SAE 10 oil has to be selected only if your
ambient temperature is dropping to sub-zero.
SAE 10 should not be used if ambient temperature
is greater than 40'C.

Monitor cooling system performance.High coolent
temperature increases hyd oil temparature and
subsequent dark color of oil.

Regards

Bala.
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