Have you tried the 'glove test' at the oil filler? Get the engine warm and see if the PCV is clogged.
Replacing the entire PCV is a 4 hour job, most of that taking things out that are in the way and cleaning them before putting it back. The PTC nipple is a royal pain, but when it gets clogged...
Until about 2 years ago, our esteemed dealer used conventional oil. Cheap bastard. The same might be true of the PO dealer.
\That whistle you mentioned earlier might be a diaphragm with a hole in it. OR it might be a vacuum line with a hole in it which will decrease mpg. Also check your Intercooler fittings and make sure they are all tight. Check your air cleaner for dirt and fit.
A clogged PCV does not decrease mpg. A bad O2 sensor could also be at fault.
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Keeping it running is better than buying new
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