WRONG
The PCV system in your car is designed to burn the blow by gasses that make it into the crankcase. When your car burns gasoline in the combustion chamber, some of the combustion gasses make it past the piston rings and into the crank case. Now, old cars had a pipe that went from higher in the crank case and just vented it to the atmosphere. This was called a draft pipe. When the car was moving, because of where the tube was located, the negative pressure from around the tube drew the gasses out of the crankcase. Venting combustion gasses to the atmosphere isn’t cool, so manufacturers designed a system to reburn these gasses
The PCV valve has a little spring in it to resist high engine vacuum during idle, deceleration, and cruising. The spring is there to prevent too much oil vapor from being sucked up into the intake and burned. If the spring fails, the engine will suck up too much oil and oil vapor and cause a low oil problem. The spring can occasionally gum up and seize as well, but this is more rare because it’s pretty well lubricated by the oil vapor.
When a PCV valve clogs, it can lead to a whole bunch of other problems. When it is clogged, there is no place for the pressure inside the crankcase to go. This usually leads to the blowing out of seals or dipsticks. This can be much more costly when a seal blows out, as you have to replace it, and it can lead to a sudden loss of large amounts of oil, rather than a slow consumption with a PCV valve that is stuck open.
