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Old 11-14-2012, 05:14 AM
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Monsignor Monsignor is offline
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Location: Pineapple Under the Sea
 
Join Date: Oct 2009
Posts: 3,176
Mein Auto: M50 Big Body
As a pollution control system, many cars for a very long time have had recirc systems of valve cover air to separate oil vapors from it, to lessen the impact of those vapors entering the engine and being burnt and sent out the exhaust system.
Burnt oil is horribly bad for the environment.

When this recirc/separation system fails, it fails to remove the oil and oil vapors from crankcase atmosphere and subsequently from being burnt.
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