This is typical nonsense , it won't hurt your engine in any way ,the crank case is under pressure , even on a new engine from ring blow by , the pcv is only for pollution control to stop oil dripping on the ground and burn the poisonous vapors formed in the crankcase
Technically not a completely correct statement. There are times when the relative crankcase pressure is lower than atmospheric while the engine is running. That is why there is a make up air hose running from the driver side of the engine to the intake air box.
True, the PCV sucks out combustion blow-by gases and some aerosolized oil and entrained water using intake vacuum. But its not so much for oil leaking as to keep those vapors from becoming emissions. Gaskets deal with leaking as long as pressures in the engine oil system do not go too high.
Before smog control most engines had a road draft tube that sucked the gases out when there was air flow across the draft tube and/or a valve cover vent. Essentially crankcase pressure was allowed to fluctuate and vent to atmosphere. With the advent of smog control those gases became regulated pollution emissions and had to be routed back into the engine for combustion or channeling through the catalytic converter.
A catch can separates the aerosolized oil and entrained water out of the PCV gases and allows the gases themselves to continue through the combustion cycle. If the aerosolized oil/water were allowed to pass into the intake the result when exposed to heat would be a slow build up of varnish on the throttle body and intake valves, and accumulation of an oily residue in the intake. More significantly that oil can cause a reduction in the flashpoint of the fuel air mixture in the cylinders causing the PCM to retard timing in order to prevent pre-ignition--in short loss of power.
Clearly Chrysler isn't worried about the consequences, but that makes sense if the effects don't become noticeably detrimental until after the warranty expires, or more likely after first owner has unloaded the vehicle. As usual the used vehicle buyer bears the consequences of bad engineering design.
In a diesel engine crankcase those gases can be explosive. That's why most diesels--especially the big power generation diesels--have a means of crankcase scavenging (suction) to prevent detonation of those gases caused by heat sources like hot bearings or friction hot spots from uneven lubrication of cylinder liners. A crankcase explosion in a large diesel will rock your world and can potentially fracture the block, rupture fuel lines or slobber lube oil all over the place leading to a major fire <---I've got that T-shirt.
