My ST225 2007 Oil filter housing (brand new genuine Volvo unit fitted 2 months ago) is leaking very slowly from the wiring connector plug.
Only a few drips per day but definitely leaking engine oil. The rest of the new housing unit appears to be dry. Its coming from inside the wiring connector, seeping down the square section of the housing and dripping off one corner.
Has anyone else ever had this? Am I unlucky enough to have bought a faulty unit or is there meant to be a rubber sealing ring on the wiring connector that pushes into the housing connector.


A drip of oil hanging off the corner

Oil pooling under the connector

Oil inside the connector socket