I suggest you drive by your BMW services Middle and check with them to top it up with coolant. It is totally free. Or else You will need to obtain a "BMW permitted" coolant combine which I've little interest in seeking to determine. Shop BMW thermostats. BMW Radiator The radiator https://dominickocfoy.jaiblogs.com/54196489/considerations-to-know-about-types-of-coolant-for-bmw-335i