Have you ever run water-wetter in the radiator? This will result in what appears to be oil in your overflow.

 

I think you are okay... just keep an eye on it. If the droplets get bigger or increase in number over the next few weeks or worse you begin to get chocolate milk for oil then indeed you HG is failing.

Do you have any coolant loss?

 

I am running water wetter, and I am seeing a thin dark brown scum/sludge collecting on the tube in the overflow tank. It sticks pretty tenaciously to the rubber tube. It doesn't easily rub off. I have to use my finger nail to scratch it off the tube. There is also a very small amount of similar stuff around the radiator cap. Lighter in color though. Nothing suspended in the water in the overflow or in the radiator.

 

It's not common at all for DSMs to lose coolant with a HG. The most common failure mode, by far, is oil in the coolant. The coolant is at 15 psi, the oil is at ~80. The oil is the one that is more motivated to move. When it starts, it only pushes the oil into the coolant under boost when high cylinder pressure lifts the head. Eventually cylinder pressure will blow coolant out of the overflow, as it gets worse. Even with it so bad I can't build 5 psi without blowing 2 quarts of coolant out of the overflow, I have never seen coolant in the oil, or in the combustion chamber. The EVO followed this same model when my HG went. I drove it for several months with it on the brink before it got so bad I had no choice but to do it ASAP.

Just keep an eye on it and make the call when the time comes.

 

Yes I do have watter wetter in it, I put it in a long time ago- Thank you very much, that definately makes sense, and Once again, I have found a simple answer to a perplexing problem.

 

That is what I originally thought was happening.
funny thing- I washed out the overflow tank, got all the gunk out, and put in fresh coolant. the coolant never went back into the radiator, and has stayed "fresh" for the last week.
I guess the water wetter is the culprit though, and will do a coolant flush/change later on.