No oil in water or vice versa but added catch can fills with buttermilk feeding from lbs rocker cover. Now dipstick is blowing out and oil spraying out inside engine bay. Can't pinpoint why buttermilk in pcv system without other symptoms.Welch plugs are brass. Engine fully built 120,000 km \ 10 years ago. Maybe I have revved the nipples off it too often? I think I know how Cinderella felt....rego runs out at midnight so two hours to get her home for some sebatical time

Sounds to me like you've got blow-by from the rings. Something is pressurizing the case.

I see why blow by could be one thing but the buttermilk.... Must be two different problems. Time for an autopsy, new rings n stuff