Sorry, I have turned this into a tech discussion...
The oil out the filler sounds weird, like a seal was missing or worse.
Guess I should pick up some clear hose an put it in-line.
Andy, that sounds high. Most people specifically try and lower water temps to 160-180...
Oil in the filler neck is still the most baffling part of all this. I guess a high quick initiation of a high G side load and then sustained could cover the bottom of the filler and then crankcase pressure push it up. I wonder if it is specific to a particular series of blocks? aren't the oil passages different EJ207 vs. 257, etc...
Doing more research, condensation is only really an issue for aircraft where temperatures are damn cold at altitude. There is no real reason for the Crawford design in automotive applications. Water is not going to condense at anything close to operating temp of the motor.
Dew Point. Cold metal at start up or well after shutdown is the only thing that would likely have water condense. If you have the "white crud" there is most likely a bigger problem than just normal condensation as that should "boil off" as soon as the car reaches operating temp.