4.2 OILCOOLER LEAK
 

I have a 2000 A6 4.2 with a coolant leak, seeminglyfrom he oil cooler.
research tells me it is the 0 rings or the cooler itself. Once the engine is warmed up it does not leak, just leaks when cold.
I am wondering if these symptoms mightnarrow it down tothe seals or the cooler?
BENG