The w140 has "drain tubes" on the sides of the transmission where the water from the AC condensation drains out. If it is clear, it is normal. If it is yellowish or brownish it might just be the dirt or oil on the underbody mixed with the water.With the a/c off there is no paddle of water. I did not worry about it until those stamps appear. I am not sure what is it? it looks like a pee. A cat or a dog may pee under my car...for sure I I'm not used to get drunk in my garage, only when my wife throws me out of the house. Never mind it looks closer to water. Do u know from where is that water coming out during a/c usage? Is there any specificy pipe that the water should leak out?