I found, on my E420, what looked like oily water, on the garage floor right behind the passenger side rear tire. There is a small , index finger size metal tube sticking down about 1/2" where this water dripped down. You can stick your finger up in this tube and feel a rounded soft rubber or plastic stop about 1/2" up. There is the same tube on the driver side. I then checked my 380SE and it has the same small tubes or vents in same locations, so I figured these must be some sort of drain tubes.

Is this correct? Appreciate your input. thanks

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95 E420 ( 76K) SOLD
85 380SE(125k)
95 SL500(72k)