Moisture out one tail pipe, and a bit in oil. any idea?

Do you got a figure on the antifreeze/water ratio? Even if the ratio isn´t high enough the coolant will just get viscous to some level. I believe that the first evidence of lack of antifreeze would be that the heater core would leak.
If you got coolant/antifreeze in the combustion chamber while the car is at idle you should have a sweet smell in the exhaust gases.
Don´t ask me how I know. lol