If you really want to know what is in the oil, Wheeler Machinery Co. has an oil lab where they will test anyone's oil. They can tell you anything you want about your oil, and it only takes a day or so for the results. It costs somewhere around $12 I think.
I finally got the oil down to wheeler and it tested positive for glycol. It was also above normal in copper, sodium, potassium and very high in lead. Looks like the engine is coming apart to find the source of the antifreeze leak and to replace the bearings.
I'm afraid the leak may be hard to find since it passed the pressure test with no problem.