Quote:
Originally Posted by rwalker
The passenger side radiator is an oil cooler. The driver side is the supplemental, PPK water radiator. I can't make out whether you have the extra water rad...
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Both auxiliary radiators are for coolant; neither are for oil. This has been verified in the F30 tech guide for the N20. Check the routing of the hoses from it, as well as the type. The construction of the radiator itself is a giveaway: the structure looks like corrugated cardboard. Oil coolers look like a thick piece of wood laminate (but made of aluminum).
The N20 already has two oil coolers; one in the driver's side nose between the edge of the main radiator and the overflow tank, and a smaller one near the thermostat on the very top of the engine.