When it rains it pours I guess... Besides dealing with my MAF/CEL light on my 05 CDI, last night the wife was driving and coolant light came on. Got it towed home. Looked at it today and it appears the leak is around the Oil cooler hose below the intake manifold. It's adjacent to the mixing chamber and the noise insulator box.

I am not aware of any hoses or cooling parts that would cause water to leak from there. Perhaps a freeze plug? The one looks good in the pics

I have a couple pics attached. In them you can see the water near the hex bolt, it's causing the sensor to get wet. Any idea on where this is leaking from?

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2005 E320 CDI - Totaled