Our cars don't really run on a true 'closed crankcase'...if they did then they would run really poorly with something as simple as forgetting to push the dipstick all the way down or leaving the oil cap loose. These two examples would be good examples of huge vacuum leaks on a closed crankcase car. They may start cold, but will not idle well if at all, they hesitate horribly, gas mileage is way off, etc.
Now if you allow too much venting of the valve cover...and if you have a bit of blow-by the rings...then you are going to get problems like the dip stick blowing out, cam seals popping out, turbo smoking (oil going through turbo), etc.
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