Most leaks from the cooler area are hose or fitting related. You'll need to monitor things for a bit so you can determine the actual source, then proceed as needed. Oil cooler radiators don't rust (at least internally) like coolant radiators and they're not under much pressure so the failure rates are pretty low.

When were the hoses replaced?

I'm wondering how oil migrates forward to exit between the hood and grille when all the airflow is towards the rear.

Weird.

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