PCV enters pre compressor. so if PCV is spewing oil it is going to go through everything behind it. my pcv enters right after my maf on my sri so everything that comes out of it will go through that pipe, the pancake pipe, the compressor, the hot boost pipe, the intercooler, the cold boost pipe, through the engine where it should be burnt up put not always, throught the turbine, and then into the cat where it shold be burnt off, if no cats it continues to burn in exhaust and makes a nice cloud of smoke out the tailpipe. bossted cars leak more beacuse there tends to be more blow by into the engine which is pressurized. that presuriced air needs to go somewhere. and when it leves it takes some oil and other hydrocarbons in the cranckcase with it.