There is a small rectangular box located just above where the oil filter screws in, which is attached to the motor. It has two small hoses attached to it. Do you know what that box is? Is it possibly the Oil Trap? Any comments, much appreciated.

Thank you

My Volvo, 2002 S80 with 120,000 miles, just began a high pitch sound from the engine. With the oil cap removed, the pitch stops. Oil cap is hard to remove, and a suction is taking place at the opening to put oil into the engine. My thought was that the PCV valve may need replacing. Cannot locate whe...