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If you have to replace the RMS, buy the Volvo OEM one. Any after market crap will just be a waste of money and you'll have to do the job again.
To check your pressure for your PCV system, place a rubber glove over the oil filler cap, with the cap removed of course and see whether the gloves blows up like a balloon, or gets sucked somewhat into the oil fill hole.
If it gets sucked in, your pressure is good, if it blows up like a balloon, you then have a clog some where in the PCV system.
Good luck.
Matt
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