Volvo Troubleshooting Questions? Ask a Mechanic for Answers ASAP
Any engine that has higher crankcase pressure that the PCV system can't manage has higher blowby (worn piston rings) than acceptable.
How many miles on this engine?
I would perform a cylinder leakdown test.
Above 20% would be unacceptable. Generally 2-6% is healthy.
There is no fix for high blowby other than rebuilding the engine.
I hope that my answer above has given you some idea of what is wrong with your car.