I'm sorry to say you guys that this is not how you fit an oil catch can on this engine, if you fit the oil catch can the way you did you are only catching the blow by from the head and not from the crankcase, which is where the vast majority of the blow by is!
The EA211 family is equipped with a PCV system fitted on the block underneath the air intake manifold they then have an hose that goes from the PCV directly to the air intake manifold, you can see better from the image below:
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To install an oil catch can on EA211 engines you have to get rid of the stock hose (Nr.1 in the diagram) and connect an hose that goes from the PCV to the inlet port of the oil catch can, you then connect another hose that goes from the outlet port of the oil catch can to the hose fitting located on the under side of the air intake manifold, you can see better from the image below:
View attachment 24382
I have personally installed it this way, and believe me i do catch a lot of nasty oil.
Metter of fact if i unplug the dipstick from the catch can with the engine running i can see vapours flowing out!
Hope this helps!