Hi guys ... I need your help badly

I'm driving the 2LT V6 2012 Camaro
My car loses oil (Around 1-2 liter per 150km)

- Car exhaust without bad smoke only if the RPM is above the 3k.
- No damaged spark plugs even after 3 months of the problem.
- RPM is stable.
- No oil on the outer side of the engine or leak points.
- No oil on the ground (Car not leaking oil out).

But I found a huge amount of oil on the end of the air cleaner hose,
coming from the breather tube !!!
Kindly check the attached pictures, and tell me what should I check before considering to open the whole engine ?