I want to hear what you think about this, I'm unsure if I should be concerned or not. I have 2 oil catch cans installed on my Z (one per V side), and I usually flush them on every oil change.
This is a picture of the driver side can, after
3200 miles and
14 months:
And here is a picture of it next to the passenger side's:
As you can see, passenger side is practically empty, and driver sides looks milky-ish:
But the oil I drained is 100% normal, which makes me think the white-ish is just humidity collected there over time.
Other people with oil catch cans, how's been your experience?