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E90 auxiliary radiator thought and question

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Hi All,

I've been searching around for some answers. But as far as I know, the auxiliary radiator that comes with the PPK2 is very small in capacity and only adds limited additional cooling power.

My original thoughts were to simply switch it to an existing oil cooler such as the one from ER with a larger capacity to improve the cooling capacity as I know there's definitely enough space on the driver side for the larger radiator. However, I realize that oil and water/coolant are very different liquids with different viscosity and other physical properties.

Can someone with more knowledge shed some light on this issue? Would it make sense to do a direct swap of the auxiliary radiator to an unused oil cooler (so oil doesn't mix in with the water/coolant)? Or are there other issues regarding this.

Thanks for your attention.

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