Hi Guys

I have got a problem with my Audi A6 2012 3.0 TFSI 7 speed Stronic 95k km,

I have oil in coolant tank. Also I have had to fill up almost a 1 litre of coolant liquid

I have had gearbox cooler replaced, engine cooler replaced, all was fine for 2 months and oil is back in coolant tank.

Does this engine suffers from any well know issues like bad gasket or cracked block or anything like that?

Any ideas?