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Can valve cover breather hose stay open?

11K views 16 replies 5 participants last post by  Argonfree  
It won't cause damage necessarily, but there won't be clean air to cycle blowby gasses out of the crank case. It can contaminate the oil (by my understanding) but that's easily remedied by more frequent oil changes.

An oil catch can in conjunction with a breather filter would be the proper way of doing it. Personally, I don't see the point other than engine bay bling. The amount of oil sucked into the intake is so minimal that you won't notice any difference in power.