Some one tell me why ? pictures for the L &R bank

[mshawari1]

Why the left bank is more dirty than the right one ?
Is this because the PVC is not working well !

I need to delete that PVC and put two hose in one oil catch can but the question is : dose the joint in the right side "without valve" fit in the left side if I bring another one..
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[XR8tt]

Crank rotation ? Maybe breather ?? Ventilation works better on one side ??? Looks good to me ....