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If the engine has a condition called "blowby", pressure will build up inside the crankcase and oil will blow out the breather. Blowby is best explained as exhaust gas leaking past the piston rings, into the crankcase. The exhaust gas has to go somewhere so it goes out the breather, and in the process picks up oil vapor and mist.
It's common among engines that have not been properly maintained or engines that have extremely high miles.
Poorly maintained engines build up sludge around the piston ring grooves causing the rings to become trapped. When that happens they can't flex and maintain contact with the cylinder walls and can't give an adequate seal.
If an air filter has not been changed properly or if no air filter has been used the rings can wear excessively and the cylinder walls can become "tapered", meaning that they too have worn. Again, this results in an inadequate seal.
I've had a 350 with 2 miles short of 200,000 with NO blow-by, and seen engines with even more. It's all in the maintenance. The 350 is a workhorse but it must be maintained. (the only reason it didn't make 200,000 miles is some *&*^ ran into me and totaled the truck.)
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