upon changing the valve cover gasket on my 04 aveo we noticed a "mystery hose" that has this oily, chunky sludge mixed with what looks like foamy radiator fluid coming out of it and into the valve cover!!! This concerns me, we have checked the oil and it doesnt appear there are any other fluids or substances in there other than oil. This "mystery hose" is located on the valve cover to this L-shaped port and is right next to the ignition coil, it appears to lead somewhere under the intake system. I even went to the dealership and they couldnt tell me what the hose was or where it connected to.

Basically, I would really like to know what the hell this hose is for & why it would be filled with that chunky sludge.