'90 740 Turbo - oil in the coolant reservoir

[1990_740Turbo]

I just picked up a '90 740 Turbo from a friend of mine. It's always ran/driven excellently. Always starts right up, smooth idle, never runs hot, etc.

I was digging around in it today, doing some general tidying up and removed the coolant reservoir cap, and to my horror it's filled with oil.

For what its worth, there is NO coolant in the oil, inside the motor. It's the other way around- there is oil in the coolant. I have no reason to believe the head gasket is gone on it.
My best guess is, the jackass I bought it from put oil IN the coolant reservoir.

I'm having it flushed this weekend, and I'll see if the oil comes back.

Is there any way the head gasket could be leaking, but no coolant is getting into the oil, etc ? I'm just really not sold on the fact that the head gasket could be blown.

[sseir39]

Check the transmission. The transmission oil cooler can let go inside the radiator (had one do it). Is the oil somewhat pinkish? Also look at your transmission fluid. If this is it, a new radiator is required along with a transmission flluid flush.