oil leak on drives side

[ernaldamerican]

I have a 2003 x5 3.0, and have an oil leak on the drivers side of engine. having a hard time finding out where its coming from. it doesn't look to be a valve cover leak as the oil isn't that high on the engine (from what I can see). One thing I thought it might be is it coming from around the font axle where the drive shaft goes thru the oil pan, and on the drivers side between the differential and oil pan there is a seal, which needs the entire sub frame dropped to replace. But I'm wondering if there is anything on that side of the motor halfway up to look at before I go any further. it is difficult to see on this side as all the air oil separator and air system is there. I didn't see oil from the air oil separator lines or bottom of canister.

Any thoughts, or if anyone has seen where its the seal around the oil tank to drive shaft would greatly appreciate to hear.

Thanks