"Yes, that happens when the "system" is overwhelmed by excessive blow by and/or periods of low vacuum such as low(er) RPM open throttle situations. Engine wear (rings), driving style, manifold pressure and fouled, restricted or sticking PCV valve or any combination will contribute to overwhelming the system.Very interesting, thanks! Is it surprising then, that I am seeing oil leaking out of that fresh air intake/source and down my intake tube? Does that mean I have air (and oil) flowing the wrong direction?
Note: My PCV seemed to be working correctly when I pulled it (as in, I was able to blow air through one direction but not the other).