The 4000 series are designed for deionized H2O, the 6000s for water, and the oil coolers for... airspirit has a 6320(?) so it was made for water. However, the oil coolers have much better performance/size because of the flat tubes with microchannels. The 4XXX and the 6XXX coolers have near-identical performance. Use the Lytron heat exchanger selector to check it out.
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