The PCV valve has nothing to do with the oil pressure, it just controls the airflow inside the engine. If the ventilation system is set up correctly there should be just a fraction of vacuum inside the engine. That keeps the oil and fumes inside and directs them to the intake where they combine with the intake air. The late B18 and B20 systems work the opposite way to each other. If you try and mix and match the two systems you can end up pressurising the crankcase and this causes oil leaks. The emissions part of testing in NY may or may not be kind to you if the tester is having a bad day and requires that your engine has the system set up by the book. On the B20 system, there should be a hose from the air filter or filter air box that goes to the oil cap. Air is drawn into the engine from the filter. If you take the oil cap off and put your hand over the hole when the engine is running it should suck on your hand. If it blows the system is set-up wrong. Yes, it is a minefield if you stray from Volvo's system. It's done to minimise emissions and that's that. If you remove the PCV and you have servo attached from the cross pipe you will have problems.
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