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Maybe you're thinking of the EGR valve which does inject exhaust gases into the intake stream - to cool the burn and reduce specific pollutants. A PCV allows the light evaporated gases (which DO burn) from the crankcase to enter the intake stream. The PCV keeps these lighter evaporation...

You will see all kinds of half-baked ideas on all kinds of car forums. There are very strange ideas that the oil and water vapors coming from the PCV to the carb are bad for gas economy, power, emissions, and other things. Yes, if you have bad or worn out rings, then way too much vapor WILL...

Allpar has an interesting look at the Mexican Chrysler vehicles: http://www.allpar.com/world/mexico.html