Oil in Coolant tank, not mixed together.

[Anwar75]

Hi All,

Long time lurker, first time poster. I recently bought a C7 Audi S6 (2012 plate) about 3 weeks ago. Car has been running ok, had a misfire which needed a coil pack changing but the other day I went to check the coolant level and found black oil in the coolant tank. Took it to a local garage to check over and they said that the ool was just sitting on top of the coolant not mixed together. They took out the oil with a syringe (we weren't able to do a coolant flush that day). The coolant underneath the oil is pink and doesn't look to have oil mixed in (I would expect a brownish/creamy sludge).

Oil in the coolant tank would indicate an oil cooler issue but in my research, the oil and coolant would be mixed together. Could it still be an oil cooler issue in this case? Anyone have any other ideas? The oil level doesn't seem to have gone down.

I've attached a pic of what it looks like now.

Thanks in advance.