Volvo S60 whistle or whining noise potentially related to oil filter housing replacement on Volvo S60

Some Volvo S60 owners report experiencing a whistle or whining noise potentially linked to the oil filter housing, which may be caused by issues with the Positive Crankcase Ventilation (PCV) system, particularly the PCV valve or its components. These owners note that replacing the PCV, integrated into the oil filter housing, can take approximately 3 hours. Additionally, some have identified the whistling noise as originating from the oil cap, suggesting air suction due to pressure buildup in the system. Others have reported that a sound resembling a whistle may indicate a failing bladder valve in the oil filter housing, leading to crankcase pressurization. It is crucial for owners to ensure the PCV system is functioning properly to prevent such noises at the oil fill or dipstick area. Addressing these potential issues with the PCV system and oil filter housing may effectively resolve the noise concerns.