I'm going to check tonight. Until this morning I didn't consider the I/C failure but I did a search for oily intake manis (which lead to threads about intercooler failures) and found several references to "guacamole". And that descriptor is perfect, because that's exactly what this feels like.

I know that at a glance, the coolant hasn't appeared abnormally low so I'm hoping Rudy's assumption that this is a pin-hole leak is correct. Perhaps isolating the I/C fluid from the engine coolant will lower the pressure enough to at least slow the leak.

Still sucks.