It sounds like coolant is getting into the oil.It’s been through a recent oil change , and new head gasket , after a few minutes of driving the oil is completely white , but I haven’t looked to see if I’m getting oil in the radiator or a loss of coolant , it was shut down only after after the light came on and the fan kicked on ... that’s what prompted the oil check , it was “running “ fine , and sounded good .
I wasn’t the one driving at the the time and don’t know of it had any air in the system