seen it. could be condensation, but leaking from the intake coolant passage is not uncommon. All it takes is a little bit. start simple: I would pull the intake, new gaskets etc. If you are careful enough draining the coolant, you might be able to catch some of the evidence of a leak in the lifter valley. By the way, coolant, esp antifreeze will makes for a VERY bad lubricant, so I would not run with milky oil.

Dallas