Has anyone out here seen oil in the coolant tank of an A8 4.2L? My car has tons of miles on it (204000) and the other day my wife called me to tell me the car had no heat. Upon investigation I noticed oil in the coolant tank. Back in November, we had someone replace the plastic pipe that connects the oil cooler to the engine so I'm wondering if that might be the culprit. I did a compression check and 6 cylinders were 160-162 and 2 were 170 so there was nothing evident there. The car has never overheated since I've owned it and I haven't found much on the internet about this problem. Any help would be greatly appreciated! Thanks in advance!

 

Did you ever figure this out?