Engine Oil. Most M models and many manufacturing unit efficiency solutions involve an engine oil cooler. In more mature products It really is an easy radiator structure utilizing oil:air convection. But in other versions coolant is used which has a heat exchanger, much like the transmission oil procedure earlier mentioned. https://automotive-technician43825.weblogco.com/27290378/the-definitive-guide-to-types-of-coolant-for-bmw