I have had similar results over the years, but mine is often mixed with water and looks like a yellow sludge floating on top.
After removing from the car I will blow brake cleaner through the catch can and then compressed air before re-installation.
When cars come up for sale, first thing I look for in the engine bay is an oil catch can. Tells me a lot about maintenance and the condition of the engine right off the bat.

 

I just ordered mine today.
I've never had one before.

Back in my day, the "oil catch can" was the pan on the garage floor! Hey you kids! Get off of my lawn!

 

I will have to order one. This is brilliant and will help keep the engine clean and extend the life. I will say the title of this thread caught my attention and please forgive me (or not) that I was compelled to write the following:

How much oil can a oil catch can can catch oil in the oil catch can? As it turns out @Valk answered this question. About 3oz of oil was caught in the oil catch can if an oil catch can could catch oil in the oil catch can.

My brain hurts from writing this.

 

Although this video doesn't display a Crossfire it still explains what a catch can is for and explains the flow of the "oil blow by" from the Crankcase of the engine.
It goes into detail as to what parts inside the engine are impacted by "oil blow by" from the crankcase
Our Mercedes 3.2 V6 engines are said to be fueled by >> Sequential fuel injection
so fortunately our valves do have the use of the fuel to help keep the back of the valves clean as seen here in the video below.

You Tube