The thermostat is where the water leaves the engine, so it will always leave the engine at (approximately) the same temperature (assuming on/off operation). All water has to go through the radiator before it re-enters the engine (and the oil cooler). So a better radiator should mean the water entering the engine (and the oil cooler) will be cooler and better oil cooling performance.
I assume the water routes through the radiator to the oil cooler before it enters the engine. Is this correct? or does the oil cooler take water exiting the engine (which seems dumb to me)?
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