Yeah, another genius "advancement" in OAT technology. Death Cool. I'll never use the stuff.
Anyway, get your oil tested for coolant. About $25. Google Blackstone Labs. If you find coolant (high potassium w/high sodium), you need the intake gaskets replaced. You're just seeing the coolant side of it (if that's the source), the Used Oil Analysis will show you how much of a beat down it's taking out on the bearings.
hat fill you had in there was subjected to air infiltration (as was mentioned). Exposure to air degraded this mockery of science/chemistry into garbage very quickly.
Flush the rad with a cleaner and get some G05 coolant or even old green. I use the PG coolants. The only thing they require is more frequent service ...which as you can see, the miracle Deathcool should have had too.