Coolant on top of engine near oil cooler

[Htci]

I found coolant on top of the engine near the oil cooler a week ago. I attempted to find the source but ended up just drying the fluid and monitoring the issue since the car was otherwise functional. No oil in coolant reservoir, no intermix detected on dipstick, no smoking exhaust. This area is near the intake manifold, head gasket, and oil cooler. If it were head gasket leak I’d expect intermix and smoke so I’m leaning towards oil cooler. What do the experts here think? Pictures coming in a few.