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Aluminum is a very reactive metal. It quickly corrodes and forms a whitish layer on the exposed metal. Usually it's a pretty thin layer and just looks like haze. For an oil cooler I'd worry more about the heat transfer rate of the material than the surface finish of the metal. A stainless steel oil cooler would stay shiny for a very long time, but it wouldn't function very well as an oil cooler since stainless has such a poor heat transfer rate.
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