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The on-engine oil cooler sees full oil pressure all the time. I recommend testing right up to value of your oil pressure relief valve. However, this won't let you know anything about corrosion or possibility of near-failure.
For some peace of mind, I'd send it over to Pacific Oil Cooler Services. They will pressure test, inspect, and clean for a reasonable fee. Money well spent, in my opinion.
I do think that Tirwin is on to something in his post above.
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