CSF BMW E30 Group A / DTM Race Style Oil CoolerWhen designing this new cooler, CSF wanted to ensure the best possible performance while ensuring the cooler was as durable as possible. As you've seen, oil coolers and other heat exchangers can take quite a beating over time. CSF utilizes an extremely rugged and durable Bar Plate design which can stand up to far more abuse. The "Aero Flow" Bar design reduces weight compared to other Bar Plate designs while maintaining maximum strength and air flow.