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The problem with the ecotec V6 PCV system is that he PCV valve is a internal part of the intake manifold, to prevent any oil from getting into the intake manifold the internal PCV valve needs to blocked and a external PCV valve added through a 2nd catch can. With the ecotecs you can't simply fit a breather on a rocker cover because of the MAF based engine management system being upset by the un-metered air.