[bmwgirl740]

I have a 1998 740I. My Check Coolant Level warning light comes on every so often. When it does, I check the level of coolant in my radiator and it is always low. This must mean there is a slow leak maybe? I have had it in the shop numerous times and they cannot find anything wrong with it. I find this odd. It never ever overheats or even gets hotter than it is supposed to. Does anyone have any ideas on what could be causing this or what this is? Thanks for your help!