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Like the best coolant radiators, engineers design enough flow resistance to maximize heat transfer. If the flow rate is too high, heat transfer is compromised. Imagine an oil cooler with passages as large as a garden hose (does that remind you of the trombone cooler?).
If you're worried one cooler is too restrictive, observe the pressure drop by monitoring and comparing the oil pressure drop betw. inlet and outlet.
For max. cooling, route the oil flow in series when two or more coolers are in the system. Oil flow will take the path of least resistance in a parallel flow set up.
Sherwood
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