My 2016 Edge with 95k just started losing coolant. Like others no sign of an external leak. Losing about 5-6oz per day. I’ve been watching it since I first read about this problem last year. Guess it’s my turn. Anyway, has anyone tried Blue Devil head gasket sealer? I used that on an old Mazda3 head gasket leak with good results. I’m thinking to try it here too.