Can you link to known problems / failure cases of the N13 engine when tuned,
if the oil cooler and a larger intercooler were also installed ?
Edit:
Here is a thread with many tuned N13 cars, Stage 1 and 2, some stock hardware, some with intercooler and some with the oil cooler as well. Only one case of failure in all of them (Slyly Stage 2) and he did not mention an oil/intercooler anywhere.