On the one hand, it could just be that the plastic has shrunk enough to have it pop out. On the other hand it might be overpressure.
If the PCV system is clean, it seems unlikely that overpressure from that is the cause. At this mileage (kilometrage) it might be that the piston rings are past their best, especially when driven in an Italian driving style ;-) . The B200F isn't the fastest engine with 111 bhp and 158 Nm or torque (my 245 has one too).
A simple test for overpressure in the crankcase is to idle the engine, remove the oil filler cap and hold your hand over the hole. You may feel pulsating air, but it must not be forced past your hand. A plastic bag over the oil filler hole should show the pulsation but not be blown away.
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