As the oil and coolant flow sequentially through the chambers of the separator, the separating properties of the oil and the coolant begin to act so that the oil raises to the surface, whereas the coolant tends to seek its way through {HEAD ~ the chambers} of {TAIL ~ the separator} 
As the oil and coolant flow sequentially through the chambers of the separator , the separating properties of the oil and the coolant begin to act so that the oil raises to the surface , whereas the coolant tends to seek its way through { HEAD ~ the chambers } of { TAIL ~ the separator }
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