Hi Ben, I have a 2006 E90 320i, my question is, I was loosing coolant through the cap of the expansion tank, I replaced the cap and the expansion tank, and still leaks, also every time I open the expansion tank to check the level it releases air pressure, it has never overheated, but the head was removed like 9 months ago for replacing valve stems seals, cause it was consuming oil. this problem started like 1 month ago. Do you think is the head gasket? The oil doesn't seem to have any coolant in it as the coolant doesn't seem to have any oil in it.
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Pelican Technical Article: BMW Head Gasket Replacement