When I have time, I will do the following experiment to mimic OFH Gasket leak...

- Get a small hose and funnel and place the tip of the hose below the OFH, just above the oil pan gasket area (as in the solid RED arrow above).

- Will add H2O, one drop at a time and see whether it goes to the bottom bolt at the rear of the engine. If this is the case, it proves my point.

- Will report back later...

- Or anyone has time, you can do this experiment and report back...

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1998 E39 528i 5sp MT
2006 E53 X5 3.0 6sp MT