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You said it runs good, etc. No outward signs of leaks.... The oil cooler tends to be much more problematic. Do the oil cooler.

Probably the oil cooler. Swap it out. completely drain the cooling system & flush it using a box of the non-frothing dish soap. I can't think of the name of the soap - its used in dishwashers though. Put the box in the system and run it for an hour. Get it good and hot. If its not clean...