The oil light went on last week on my Expedition 600 ACE 2015. I changed the oil and found the old one to be very milky and liquid. Didin't think much of it at the time but a week later the same thing happened. I saw a couple of old posts here suggesting water or coolant could leak into the engine and contaminate the engine oil. Sounds about right but I'm still looking on how and where this is happening with this newer type of engine. Any advice?