Yellow residue under some hoses?

[wangshuo1989]

I found my car's front belly pan gets a bit wet, so I went ahead and remove it to track the source. And I found that there was some oil dripped down from two hoses at both driver and passenger side and formed some yellowish residue. I have no idea what this is. Anyone has such experience? Car is a 2013 S5.

Passenger side:


Driver side:

[JamesRS5]

Oil and water mixed together makes a yellow (Mayo) looking substance. You usually find it in engine breather hoses where the oil has been a very fine hot mist and mixed with cool damp air or water.
Is that a breather hose the yellow fluid is on?

[wangshuo1989]

Oil and water mixed together makes a yellow (Mayo) looking substance. You usually find it in engine breather hoses where the oil has been a very fine hot mist and mixed with cool damp air or water.
Is that a breather hose the yellow fluid is on?

Thanks for the info, I'm not sure where the breather hose is though. But those two hoses were at the very bottom of the car, just above front belly pan. It's surprising to see that there were so much gunk there and it actually melt and made the car's belly pan wet.