just saying, but if you HAD water in your motor, and in the oil pan, , just draining OLD oil will never get ALL the water out
when you just drain add new oil/filter, and run, your NEW oil will start to turn OLD looking FAST and can even show signs of water delusion in it!
as when your drain OLD oil, there is always some water that remains inside clinging to things in droplets and such, and or can be trapped in low spots , and running oil that was mixed with oil, can also, cause gunk and such to build and or come loose once NEW oil is mixed into things and motor is run after new oil
which then make again the new oil look BAD FAST or faster than it should!
Folks that end up with sunk motors for an example, , tend to do several oil changes and or flushes with diesel, TRYING to get everything out and back to a GOOD clean as can be inside of things
but even after a few flushes and oil changes, , they still tend to replace oil sooner than normal intervals , due to again, you never get it all out by JUST doing oil changes and flushes
now I am NOT saying you don't have an issue with coolant getting into your oil, I am just saying, that just cause you drained and replaced with new oil
that new oil might NOT stay looking new long, due to events from the water being in there before!
IMO<
if you ran motor till it came up to operating temp, and had water in the oil, you should have seen some sort of exhaust color change/smoke!
as its what it does when water is in oil?, or say coolant in oil, as That is what I gather you mean, unless your actually filling radiator with just plain water?? and if coolant is in oil at operating temps, it should also have a smell to it!
before and after running motor after oil change, did coolant level drop??
I know you said, NO bubbling in rad you could see
but did level change??
you could also send out a OIL sample to have analyzed, to tell you what is in the oil, as in if water is some getting in some odd way, , , or if coolant is getting in to it some how from radiator!/cooling system!
granted that depends on what you have for coolant in radiator(water or actual coolant)