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As mentioned, the higher fin density should mean higher heat transfer by virtue of greater surface area. But you should also consider the radiator behind all this and how much the oil cooler is going to block airflow/dump heat in front of it. At this point you need some data, at least a simple water temp and oil temp read out, to make an informed decision. If you noticed that your oil temps were fine but your water temps were creeping up then the sparser fins of the GReddy cooler might be the better choice. Or realistically, for a street car, it's probably not going to matter much either way.

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